Specific gravity of the floor slab - How much does a concrete slab weigh. Classification and dimensions of reinforced concrete floor slabs Dimensions of hollow core slabs
Specific gravity of the floor slab. Weight of hollow and solid floor slabs.
Reinforced concrete floor slabs in general construction estimate does not occupy a dominant place, but in terms of mass indicators this design element cannot be discounted. At the project development stage, it is necessary to clearly calculate what loads the walls and base of the building can bear, and then make a choice in favor of one or another type of interfloor covering.
Types of reinforced concrete floor slabs
The variety of modifications of this building element is relatively small, all of them are standard, as they are produced exclusively in accordance with GOST standards. All existing types of reinforced concrete products meet safety requirements for the construction of high-rise, low-rise or industrial buildings.
- A solid floor slab is a monolithic product that does not have large internal voids. The weight of a slab with a thickness of 120 mm is from 4300 to 7100 kg. Moreover, the higher the grade of concrete, the greater the strength and weight of the floor element. The weight of a 160 m thick floor slab is up to 8700 kg.
A variety of solid floor slabs are additional elements. The length of such products is standard for full-size slabs (1.8 - 5 m), but the width is much smaller, as is the weight (up to 1500 kg).
- Hollow (lightweight) floor slabs have less weight, since their body is pierced with technological holes of a certain shape. These are mainly round chambers with a diameter of 140 to 159 mm (PK1, PK2); there are types of hollow slabs with ellipsoidal chambers (PG) and different shapes (PB).
The presence of voids in the body of the slab allows the weight of standard 6-meter floors to be reduced to 3 tons. The advantage of hollow slabs is their good heat and sound insulation characteristics.
- Ribbed concrete products can be classified as monolithic, since internal cavities they do not have. These are slabs with enhanced load-bearing capacity, which they received thanks to side solid-cast ribs. Standard 6-meter slabs weigh from 1500 to 3000 kg, and industrial 12-meter “giants” reach 7000 kg.
- The floor slab made of polystyrene concrete is a lightweight version of the floor slab, where it is used as a filler thermal insulation material. The strength of such slabs is slightly lower than classic reinforced concrete products, but is sufficient for loads of 400–500 kgf/cm2. The weight of polystyrene concrete slabs is two times lower than classic solid ones, while the insulating qualities are several times higher than those of conventional reinforced concrete products.
How much do different floor slabs weigh?
The weight of the slabs depends on many factors, in particular on the brand of concrete used, the number of reinforcing elements, samples, voids and other factors.
how much does a concrete slab weigh - how much does a concrete slab weigh? length 3.50 meters width 0.77 meters thickness 15 cm - 2 answers
In the Construction and Repair section, when asked how much it weighs concrete slab? length 3.50 meters width 0.77 meters thickness 15 cm asked by the author MAN the best answer is such a slab of 0.4 m3 weighs about 1 ton.
Reply from 2 replies[guru] Hello! Here is a selection of topics with answers to your question: how much does a concrete slab weigh? length 3.50 meters width 0.77 meters thickness 15 cm Answer from SnaipeR [guru] you should find out the density, multiply by the dimensions and voila, you get the weight Answer from Bely Oleg [guru] 
A couple of crowbars, a 50 pipe as a lever, pieces of asbestos-cement pipe as rollers and wooden blocks as a support for the lever - long, tedious, hard... but it’s feasible...Answer from Alexander Bakushev[guru] a winch will help you, or Jacques!Answer from Truculentus[guru] Hire a tractor, strap it on and pull it slowly. Hardly for one. Weight is about a ton. Answer from Sergey Alcohol [guru] hollow 0.7., monolith 1000, you can move 4 pieces on round logs. Answer from 2 answers [guru] Hello! Here are more topics with the answers you need:
Weight, dimensions, volume of floor slabs according to GOST. Online calculator for calculating weight and volume by size
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Weight of floor slabs of different sizes
Types of slabs and their weight
Cost of slabs
vest-beton.ru
Floor slab weight: monolith, hollow core, ribbed, polystyrene concrete
In the construction of residential and administrative buildings, industrial complexes, and heating mains, reinforced concrete floors are widely used. Their popularity is explained by their strength, reliability, fire resistance, and environmental safety.
Types of plates and their features
The ceiling in the structure serves to separate floors from each other horizontally, as well as living spaces from attics and basements, and to block access to communications. In addition to the separating and enclosing function, it plays a protective role, giving rigidity to structures. Production is regulated by GOST 23009-78, which also establishes a system of alphanumeric designations. Indicate the type of product, brand of solution, linear parameters and additional information. Weight is not included in the marking; it is determined to a lesser extent by the type of concrete and to a greater extent by the dimensions.
1. Monolithic.
This type of ceiling has a high specific gravity, since there are no cavities inside it. Standard ones are most often cast from heavy concrete. They will be much more massive when using a high grade. The weight of floor slabs is also affected by linear dimensions. Depending on the thickness they are divided into two types:
- 1P - 120 mm, weight varies from 4.3 to 7.1 tons;
- 2P - this option is more powerful (160 mm), up to 8.7 tons.
A lightweight 120 mm slab requires thermal and sound insulation. After carrying out the appropriate work, the ceiling will weigh slightly more (the weight of the product, insulation, and sound insulator is added up).
According to GOST 19570-74, solid panels for indoors can be made from autoclaved cellular concrete (strength grade 25-150, volumetric weight - 800-1200 kg/m3) and used at a humidity of no more than 75%. Length - from 0.6 to 6.0 m, width - up to 1.5 m with a thickness of 200 or 250 mm. The standard ceiling of this group, brand P60.12-3.5Ya (6x1.12x0.25 m from M35) weighs 1.1 tons.
A separate type - additional elements that allow you to assemble structures custom size. These reinforced concrete products are selected according to length, it is equal to the corresponding parameter regular stove(1.8-5 m). The width is small and the weight is no more than 1.5 tons.
2. Void.
Thanks to special technological holes, the weight load exerted by the hollow panel on the foundation and walls is less significant. Depending on the number and configuration of cells, there are three types:
- PC - the ceiling contains round chambers; diameter 159 mm corresponds to the marking 1PK, 140 mm – 2PK;
- PB - this is how hollow slabs with various options cells;
- PG – 260 mm thick with ellipsoidal voids.
Due to the holes, the working cross-sectional area, volume and weight are reduced, and load bearing capacity. Among the advantages, it is worth noting improved heat and sound insulation properties. A product with internal chambers is usually used to form a basement or interfloor ceiling. The weight of hollow core slabs 6 m long, depending on the strength grade of concrete, is 2.8-3 tons. To enhance the thermal insulation effect and not increase the weight too much, you can stuff it with cellulose, mineral wool, foam plastic.
3. Plates with a ribbed surface.
They represent beams connected to each other and filled with concrete. They have a U-shaped cross-section and are characterized by high load-bearing capacity and resistance to bending stresses. Not only solid cast ribs work for bending, but also reinforcing ones metal elements. Powerful reinforced concrete floors are suitable for attics, industrial buildings, especially for “hot” shops and chemical production. They are rarely used in residential buildings: in this case, the panel will have to be covered with cladding, and this requires additional costs.
The weight of a standard size slab (3x6 m) may vary. It depends on the material from which it is made:
- lightweight concrete– 3.8 t;
- heavy - 4.73 tons;
- dense silicate – 4.0 t.
4. Made from polystyrene concrete.
Lightweight types manufactured directly on site construction site made from a mixture of foamed polystyrene, Portland cement and quartz sand. Overlapping provides high-quality thermal insulation and fire protection, absorbs noise, and has a high frost resistance index. Throughout its entire service life, the material retains its structure unchanged. Compared to reinforced concrete, they are less durable, although with standard strength indicators of 400-500 kgf/cm2 they cope with their functions quite well.
Overlap with polymer additive helps solve the problem of reducing the load on load-bearing walls and foundations. A cube of reinforced polystyrene concrete weighs approximately 1 ton - this is approximately 2 times less than the specific weight of classic monolithic slabs made of heavy concrete (although somewhat more than hollow ones). Polystyrene panels are useful for reconstruction and overhaul of buildings with weak foundations.
Cost and weight
The price depends on the quality of the materials used in production and the distance of the manufacturer from the construction site. When purchasing massive products, you can try to reduce costs: find out the terms of wholesale deliveries, get acquainted with promotional and bonus programs. To save money, they buy lightweight hollow options. Prices for floors in the Moscow region:
stroitel-lab.ru
Concrete floor slabs: weight, thickness, length
During construction multi-storey buildings are used different materials. However, an integral element of any such structure are concrete slabs. Floors in houses made from them ensure the reliability and safety of the structure. These products are used not only in the construction of houses. The dimensions of concrete floor slabs allow their use in the construction of road networks, channels for engineering systems. 
Varieties
Concrete floor slabs are classified according to different criteria. Among them:
- Type of concrete. Plates can be made from dense, light, heavy, silicate compounds.
- Internal organization. Concrete floor slabs can be solid (solid) or hollow (multi-hollow).
- Thickness, width and length. Standard parameters are established in GOSTs.
- Method of resting on crossbars or load-bearing walls. Concrete floor slabs can be cantilevered (such products are used for arranging canopies and balconies), beamed (on both sides), 3-4-sided.
- Section profile. According to this criterion, beveled, rectangular, ribbed slabs are divided.
- Manufacturing method. The slabs are prefabricated and monolithic.
- Production technology. Products can be manufactured by vibration, casting, or continuous methods.
- Reinforcement method. The slabs are pre-stressed, conventional, and non-stressed.
Nuances
It must be said that the cost of hollow-core concrete floor slabs reinforced with reinforcement differs significantly from the price of monolithic products. Despite the fact that hollow slabs can withstand less load, they can be used in construction interfloor ceilings. Due to the voids, the weight of the concrete floor slab and, accordingly, the load on the walls are significantly reduced. The foundation of the structure is thus under less stress.
The voids are located along the length of the concrete floor slab. However, its indicator may not always be greater than the width. For a slab supported on 4 sides, the length is considered to be the smaller dimension in plan. In other products it will be the side that does not lie on the supporting structures. 
Reinforcing mesh
It is used in reinforced concrete products. Reinforcing mesh significantly increases the cost of slabs. The solution provides reliable protection metal rods from aggressive environmental influences, so they are not subject to corrosion.
Metal helps maintain the solidity of concrete. It takes on the tensile load. There is no metal reinforcement in concrete floor slabs. Accordingly, they are inferior to reinforced concrete products in terms of strength.
Monolithic slabs
Reinforced concrete products can have different shapes. Their frame is connected to the structure of the house and forms a single whole with it. This reduces the thickness of the walls and the consumption of concrete mortar. total cost materials is thus reduced. However, monolithic products have a number of disadvantages. They are as follows:
- The period of concrete strength gain in such products is quite long.
- To install monolithic slabs, formwork installation is required.
Prefabricated reinforced concrete and concrete floor slabs significantly reduce the construction time of a building, since they are delivered to the construction site already in finished form. In addition, there are significant labor savings. For houses with a simple configuration, it is more advisable to use prefabricated slabs. 
Specifics of using metal rods
Concrete floor slabs with prestressed reinforcement are produced single- or multi-stressed. Before concreting begins, the rods are stretched onto various structures: matrices, bench stops, forming trays.
As the solution gains strength, forces are transferred from the reinforcement located in the channels in the body of the structure or in the grooves located on the outside.
Adhesion of materials is ensured by an injected anti-corrosion coating or solution. Hollow slabs are made stressedly reinforced, regardless of their size.
Solid products
Solid slabs used for interfloor floors are produced in accordance with GOST 12767-94.
It is worth saying that such products are used in residential construction extremely rarely, due to their heavy weight. Such slabs are irreplaceable when the structure involves high mechanical loads.
Options
The classification of solid slabs is carried out according to the method of support:
- On 2 sides – 2PD – 6PD.
- On 3 sides – 3 PT – 6 PT.
- On 4 sides – 1P – 6P.
The thickness of the concrete floor slab is indicated digitally:
- 100 mm – 1;
- 120 mm – 2;
- 140 mm – 3;
- 160 mm – 4;
- 180 mm – 5;
- 200 mm – 6.
The dimensions of the products in plan are:
- Length – 3-6.6 m;
- Width – 1.2-6.6 m.
Mandatory requirements
According to state standards, reinforced concrete slabs must contain:
- Structural elements or embedded parts made in the form of releases of reinforcement bars. They are designed for joining with metal and reinforced concrete frame parts.
- Through channels. They are used to pass electrical wires or other networks.
- Mounting loops.
Standards establish standard indicators of frost resistance and water resistance of slabs, quality and strength of materials, including metal rods. There should be no concrete sagging on the embedded elements. To prevent injury, the rod outlets must be protected.
Attention is paid to appearance products. There should be no chips, cracks, or deep holes on the surface of the slab.
Hollow-core products
They are distinguished by high noise insulation, low thermal conductivity, relatively low weight and affordable cost. Both surfaces of the plate are front. When installed, one becomes the floor top floor, the second - the ceiling of the lower one. 
The production of such plates is carried out according to GOST 9561-91 standards. The state standard provides for the classification of products into the following groups:
- With round voids, supported on 2 sides - PC, on 3 sides - PKT, on 4 - PKK.
- Manufactured using the method of formless continuous molding - PB.
- With pear-shaped voids supported on 2 sides - PG.
The thickness of hollow-core products is 160-300 mm. The most popular size is 220 mm. The holes may be different diameters(114-203 mm). It depends on the thickness of the slab. The length of the products is 2.4-12 m, width – 1-6.6 m.
These slabs, as well as hollow slabs, must contain additional elements, described above. To strengthen the ends are sealed cement mortar or use another method provided for by the regulations.
Ribbed slabs
They are usually used in the construction of industrial buildings. Stiffening ribs provide high stability to mechanical damage. The disadvantage of such products is their unattractive appearance.
Depending on the purpose, the slabs can be mounted with the ribs up or down. As a rule, the second option is common. Slabs are manufactured in accordance with GOST standards. For products with a height of 400 mm, State Standard 27215-87 applies, for prestressed products with a height of 300 mm - standard 21506-87. 
For the production of ribbed slabs, lightweight or heavy concrete. Products are used:
- In unheated and heated rooms, outdoors.
- At temperatures from -40 to +50 degrees. By doing additional requirements temperature range can be expanded.
- In areas with estimated seismicity up to 9 points.
- In gaseous, slightly, moderately or non-aggressive environments.
The classification of ribbed slabs is carried out depending on the method of support on the crossbars:
- On shelves - 1P.
- On top part beams - 2P.
At the same time, 1P slabs have 8 standard sizes, and 2P - one. The length of the products in the first case is 5.05 and 5.55, and the width varies in the range from 0.74 to 2.985 m. 2P ribbed slabs have a standard size of 5.95x1.485 meters.
Prestressed products are available in three standard sizes. They differ in shape and width. All have a standard length of 5.65 meters. Width P1 – 2.985, P2 – 1.485, P3 – 0.935 meters.
In technical regulatory documentation the requirements for reinforcement bars, concrete and finished products in general are determined. In addition, possible tolerances are indicated. Manufacturers of concrete slabs must strictly comply with all requirements.
Conclusion
Concrete slabs are currently considered one of the most popular building materials. Manufactured at the factory according to all rules and in accordance with standards, they are reliable, durable, and safe. They are successfully used not only for the construction apartment buildings and industrial buildings. Concrete slabs are often used in the construction of low-rise private houses. 
Concrete slabs can be used for low temperatures, in harsh climatic conditions. One of their undoubted advantages is ease of installation. Prefabricated slabs are installed quickly enough with relatively little labor. Their size makes it possible to cover quite significant areas of the structure in a short time. Difficulties may arise with the delivery of material to the construction site. For transportation, special machines with high load capacity are used. To improve the quality, strength and reliability of products during production, special mixtures are added to the concrete solution.
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Hollow-core floor slabs technical characteristics and weight
If you have ever encountered the issue of constructing a country house, own home or apartment renovation, then you should know what hollow-core floor slabs are, the technical characteristics of which will be presented in the article. If you know design features, as well as the characteristics of the product, using the information provided by the marking, it is possible to determine what limit of decorative payload the floor slab can endure.
Main varieties and positive features
Hollow floor slabs, the technical characteristics of which will allow you to carry out construction or repairs, excluding errors, differ from solid products in their less impressive weight and affordable cost. But their reliability and durability are no less. The number and location of voids cannot reduce the load-bearing characteristics. On the contrary, thanks to this addition, the heat and sound insulation properties of the building are increased. Among the positive characteristics, one can highlight the popularity when it is necessary to construct reinforced concrete multi-storey buildings, monolithic buildings and private houses. There are often cases when the described slabs become part of the supporting frame of the building.
Dimensions and weight
Hollow-core floor slabs, the technical characteristics of which you should be interested in before purchasing these products, may have different prices depending on size and type. Dimensions range from 1.18 to 9.7 meters in terms of length. While the width varies from 0.99 to 3.5 meters. The most common are products whose length is equivalent to 6 meters; the width of the most purchased slabs varies in the range from 1.2 to 1.5 cm. The constant value is the height of the slab, which is 22 cm. Hollow-core floor slabs, the technical characteristics of which are presented below, have very significant weight. That is why for their installation it is necessary to use an assembly crane. You should rent one that has a capacity of no more than 5 tons.
If we are talking about a slab whose dimensions are 1680x990x220, then its weight is 0.49 tons.
Specifications
To purchase products, it will not be enough to know only the weight of hollow-core floor slabs. It is important to familiarize yourself with the main technical characteristics. Concrete is used as a raw material in production, which is made using cement grades M300 and M400. The numbers will determine the qualitative features of the material, which will ultimately be characteristic of the finished product. Thus, M400 cement is capable of undergoing a one-time load equal to 400 kilograms per cubic centimeter per second. As for cement grade M300, it is a derivative mixture from M 400. Despite the fact that this material is able to withstand less impressive loads, it is characterized by plasticity, which ensures that there is no breakage during deflections. If you decide to purchase hollow core floor slabs, the load specifications presented above should interest you. Among other things, reinforcement is used to strengthen the products, which provides an impressive load-bearing capacity of the monolith. During the manufacturing process it is used stainless steel class A3 and A4. It is characterized by increased resistance to corrosion processes and temperature changes. Thus, the products can be operated from -40 to +50 degrees.
The key to bending resistance
Despite the fact that the weight of hollow core floor slabs is quite impressive, they do not bend during operation. This effect was achieved by pre-tensioning the reinforcement, which is capable of distributing the stress of the elements over the entire area. After the concrete hardens and becomes strong, the tensioned elements are cut off. At the ends where the slab rests on the load-bearing walls, double reinforcement is laid. This eliminates deformation under weight pressure and ensures the ability to bear the load from load-bearing upper walls.
Characteristics of slabs depending on markings
Hollow-core floor slabs, the characteristics of which must be known before purchase, are marked. The product is designated by two letters – PC. This is followed by a number that indicates the length of the product in decimeters. The following numbers are approximate widths. The last indicator indicates how much weight in kilograms can affect 1 square decimeter of the slab, taking into account its own weight. Thus, if in front of you is a slab marked PC 12-10-8, then this indicates that the length is 1.18 meters, which is approximately 12 cm. The width is equivalent to 0.99 meters. As for the most impressive load that the product will be able to endure, it is equal to 8 kilograms per square decimeter. The last value is 800 kg per square meter.
Additional information about possible loads
It is worth noting that reinforced concrete hollow-core floor slabs are capable of withstanding the above-mentioned load; this indicator is the same for almost all hollow-core reinforced concrete products used as floor slabs. As an exception, we can highlight products that bear weights of up to 1000 and 1250 kilograms per square meter. Such slabs can be recognized by their markings, which end with the numbers 10 and 12.5, respectively.
Influence of characteristics on installation features
The main rule for reliable installation of slabs is compliance with the rules governing support on walls. If the support area is insufficient, the walls may become deformed. Whereas excess area will lead to increased thermal conductivity. The support of hollow-core floor slabs for a brick building should be 9 cm. If we are talking about foam concrete and aerated concrete, then this figure increases to 15 cm. For steel structures the figure should be equal to 7.5 cm. In this case, the greatest depth of embedding of products in the walls should not be more than 16 cm for brick structures and light blocks. For concrete structures and reinforced concrete analogues, this figure is equivalent to 12 cm. Before installing the slabs, the edges of the voids should be sealed with with the help of the lung concrete composition, deepening by 12 cm.
Hollow-core floor slabs, the dimensions of which are specified in GOST in the article, should not be laid without mortar. A layer of mixture is laid on the working base, the thickness of which should be equal to 2 millimeters, but not less. This will ensure that the load can be transferred evenly to the wall structure. Among other things, when installing slabs on fragile walls, for example, made of aerated concrete or foam concrete, mixture reinforcement technology should be used, which will eliminate the possibility of the blocks bending. In order to reduce the quality of thermal conductivity of the ceiling, it is necessary to insulate the structure from the outside.
GOST 9561-91
According to state standards, hollow floor slabs are installed on load-bearing structures of buildings and structures for various purposes. The production process uses concrete, with which products with a thickness of 220 millimeters are formed. Inside there are round voids that have a diameter of within 159 millimeters. From the central parts of two adjacent voids, the step is 185 millimeters. Hollow-core floor slabs, the dimensions of which are listed in GOST above, have frost resistance, which is determined by the F200 grade. It is necessary to purchase slabs that were manufactured in accordance with the rules of state standards.
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monolithic and hollow structures, sizes, prices
Floors from reinforced concrete slabs have become widespread in the construction of residential, industrial, administrative buildings, heating mains, and other structures. Dimensions and weight of reinforced concrete slabs are determined by their type, purpose, and technical characteristics. Modern reinforced concrete products are strong, durable, fireproof, and environmentally friendly.
- Classification and characteristics
- Expenses
Types and weight of reinforced concrete slabs
Floors in structures and buildings serve as interfloor partitions and roof foundations. Production is standardized by GOST 23009-78, which provides for special labeling. A set of numbers and letters indicates the type of reinforced concrete products, concrete grade, dimensions, and other parameters. The construction market offers a wide range of floors. In addition to the main functions - horizontal separation and fencing of structures, they provide structural rigidity. The entire range of reinforced concrete slabs is divided into solid and hollow.
1. Monolithic - ceilings of administrative and public facilities. The use of structures with a thickness of 120 mm requires the organization of heat and sound insulation. The weight of a solid slab 3600x400x120 mm is 0.24 tons.
2. With voids (PC) - universal reinforced concrete floors used in low-rise and industrial construction. The presence of air chambers along the entire length provides high noise and heat insulation characteristics. If necessary, cylindrical cells are filled with insulation (mineral wool, cellulose, expanded polystyrene). Depending on the concrete used, the weight of a 6x1.5 m hollow core slab varies from 2.8 to 3.0 tons.
One of the varieties of solid concrete products is ribbed. Essentially, these are systems of beams intersecting each other, filled concrete mortar. The main area of application is the construction of industrial facilities with high load-bearing capacity requirements horizontal structures. With the same dimensions, for example, 5550x2985 mm, ribbed floor slabs can have a weight of: 3.8 tons for lightweight concrete, 4.73 for heavy concrete. Installation of solid and hollow concrete products is carried out on 2–4 walls or on columns, using specialized heavy equipment, secured to special metal ears.
Low-rise construction, in addition to slabs, uses beam floors. Wooden, metal or reinforced concrete beams installed on walls. They are covered with plasterboard from below, clapboard - the ceiling, boards are laid on top of the joists, sheets of chipboard or plywood are laid on the floor. The space between the sheathing is filled with heat-insulating materials. New construction technology involves the use of large-format hollow blocks laid on reinforced concrete-ceramic beams. The porous structure ensures the low weight of the ceiling and its high sound, heat and noise insulation properties.
Price
The price of reinforced concrete products is determined by the weight, dimensions, quality characteristics of the materials used, delivery conditions, location of the manufacturer’s plant, and the facility being constructed. For large order volumes and regular deliveries, discounts are provided. Also, the cost of floor slabs of various weights is influenced by the availability of current promotions and bonus programs. Average prices of Moscow companies:
| Name | Size, mm | Weight, kg | Price, rubles | ||
| PIK ARTStroyInvest | JBI StroyGroup LLC | LLC TD Pro Concrete Products | |||
Full-bodied |
|||||
| PRTm-3 | 1600×400×80 | 85 | 1 080 | 750 | 850 |
| PRTm-4 | 1800×400×120 | 100 | 1260 | 830 | 930 |
| PRTm-5 | 2000×400×120 | 130 | 1590 | 1120 | 1250 |
| PRTm-6 | 2200×400×120 | 140 | 1720 | 1230 | 1380 |
| PRTm-7 | 2400×400×120 | 155 | 1960 | 1420 | 1600 |
Void |
|||||
| PK-26-10-8 | 2580×990×220 | 78 | 4250 | 4470 | 4490 |
| PK-27-10-8 | 2680×990×220 | 83 | 4600 | 4510 | |
| PK-28-10-8 | 2780×990×220 | 85 | 4510 | 4790 | 4680 |
| PK-29-10-8 | 2880×990×220 | 88 | 4850 | 4910 | 4810 |
| PK-30-10-8 | 2980×990×220 | 92 | 5080 | 4570 | |
You can save on the purchase of reinforced concrete floors in several ways: compare prices from different manufacturers, familiarize yourself with the terms of current promotions, and immediately purchase a complete set of reinforced concrete products required for construction. It is possible to replace conventional hollow core slabs with lightweight ones - the same dimensions, but less weight. Sometimes managers offer to purchase substandard products. Durability, high degree of strength and reliability provide the possibility of recycling reinforced concrete products. Each option is considered taking into account the requirements of a specific project.
hardstones.com
Weight of hollow core slab, U-shaped, 6x1.5, prices
Floor slabs are one of the most popular building materials. They are horizontal load-bearing structures in the shape of a parallelepiped and dividing the building into floors. Their main functions are to ensure fire safety, heat protection and soundproofing. The volume, dimensions and weight of the floor slab depend on its purpose.
Types of slabs and their weight
The construction market offers a wide range of reinforced concrete dividing structures, but experts distinguish three main types:
- Hollow ones have cylindrical voids inside, the so-called air chambers. Their presence makes the panel rigid and allows it to withstand significant mechanical loads. Air chambers help hide electrical wiring, low-current networks, as well as pipeline forced ventilation. They also reduce weight throughout concrete structure and, as a result, reduce the overall load on the foundation. The weight of a 6x1.5 m hollow core slab is about 3,000 kg, which makes it easy to install. Concrete panels with air chambers are used in the construction of cottages, warehouses, garages, shopping and office centers.
- The main advantage of a continuous floor is its high load-bearing capacity. The weight of reinforced concrete slabs is usually 7,000 kg, which makes it possible to provide a maximum permissible load above 800 kgf/m2. It is advisable to use it in the construction of buildings with a massive frame, in the construction of heating mains, as well as in the process of constructing impassable openings. The disadvantage is high sound permeability.
- The ribbed ceiling is a U-shaped reinforced concrete product with longitudinal ribs in the upper part. Application in the construction of residential buildings is not possible, since they do not allow creating a flat ceiling. More often they are used for the construction of industrial and auxiliary buildings for various purposes. Ribbed floor slabs can weigh from 65 to 2650 kg. Such panels are distinguished by the presence of a reinforced reinforcing frame that can withstand severe bending loads.
Cost of slabs
The price of floor slabs of various weights ranges from 3,600 to 13,800 rubles/piece. The cost of the product directly depends on its weight and size. Below are the prices of Moscow companies for hollow core slabs, the size of which is 6x1.5 m and weight - 3,000 kg.
As a rule, product delivery is carried out by the company’s own vehicles, equipped with manipulators, truck cranes and low-loading platforms. Reinforced concrete panels will cost you less if you can organize their removal from the warehouse yourself.
stoneguru.ru
existing types, advantages and disadvantages, dimensions and weight of the floor slab
When constructing buildings and structures, the most important structures, of course, are considered to be load-bearing ones. It is very important that the building structure is durable and lasts for many years. Floor slabs can be used as load-bearing walls and as load-bearing horizontal floors. They can be between floors and attics. Since during the construction of a building, and subsequently during its operation, the greatest load falls on the load-bearing structures, which must belong to a high strength class. Moreover, they must be able to bear not only their own weight, but also the weight of all structures located inside the structure.
Types of floors and areas of their application
Today, in the construction of residential and industrial buildings and structures, not only reinforced concrete slabs, but also concrete ones are widely used. The former can be not only flat, but also ribbed. Their peculiarity is that the gap between the ribs is no more than 150 cm.
Floor slabs have also found wide application in laying heating mains. With their help, the pipes are closed, and after that they are covered with earth. Thus, the heating pipes remain safe and sound.
All floor slabs can be divided into six main types:
- Void;
- Ribbed;
- Full-bodied;
- Monolithic;
- Solid additional ones;
- Lightweight.
Full-bodied are able to protect the building much better and more reliably from cracks and possible deflections. Their thickness is at least 160 mm and they have excellent sound insulation.
Void have found their wide application in the construction of buildings and structures made of concrete, brick or wall blocks; They are used in this case for floors between floors. Due to the fact that the stove is not monolithic design, the degree of its heat and sound insulation increases.
Ribbed structures are ideal for roof installation various kinds buildings that have industrial purposes. Suitable for warehouses, industrial garages or hangars. As a rule, such rooms are not heated and have a very large area.
Monolithic the products are also considered durable, since they are made from reinforced concrete structures of a continuous reinforced type. Able to withstand increased power load. Perfectly suitable for multi-storey construction.
Solid additional slabs are made of concrete, which has a higher strength class. Used as carriers. Due to the fact that they are made of concrete high density, able to withstand heavy loads.
Lightweight floor slabs They differ from the others in their light weight. They have a multi-hollow structure. They are used in the construction of buildings that have an insufficiently strong foundation. When using this type, there is no additional load on the foundation. These include slabs made of polystyrene concrete.
In addition to these divisions into types, floor slabs also differ from each other in thickness values and the absence or presence of voids.
Advantages and disadvantages
Reinforced concrete slabs are considered the most common, and it is their advantages that are worth considering in more detail. Compared to pouring and monolithic concreting, reinforced concrete slabs have significant advantages.
Due to the fact that most types have voids in their design, this improves their soundproofing qualities. Due to the same voids it is achieved lightest weight the slabs are thus the load on the foundation becomes significantly lower, which, of course, also has a positive effect on the structure itself. However, it is worth remembering that not all types of products have a sufficient number of voids, due to which their weight is reduced. That is why when purchasing you should pay attention to the product labeling.
If you need to lighten the load on the foundation, you should choose slabs with the largest number of voids. However, if you need a more stable and durable structure, if the building is being built multi-story, then it is better give preference more durable structures . Slabs with many voids in their structure also contain prestressed reinforcement, which gives the greatest strength. Due to this, the slabs can easily be used in the construction of buildings with medium load.
Specifications
Various products With different markings Each has its own thickness, void size and diameter. The dimensions and presence of voids, their diameters are determined in accordance with GOST 9561-91. Marking is carried out using alphabetic and digital designations. It is divided into two parts. Marking is carried out according to GOST 23009. For example, a slab marked 1PK 68−10−8 A T.V. The first part indicates that this product with round voids has:
- thickness 220 mm,
- void diameter equal to 159 mm,
- support occurs on 2 sides,
- length - 680 cm,
- width -1 meter.
Using the second part of the marking, you can determine the load on the floor that can be exerted (800 kg per m 2), and A T V - prestressed reinforcement of class A T. V. Also in the same marking the frost resistance of the product, embedded parts and much more can be indicated.
| Marking | Description of floors | Diameter voids, mm | Thickness, mm | Number of sides for support |
| 1P | Single layer solid | – | 120 | – |
| 2P | Single layer solid | – | 160 | – |
| PB | Produced by the method without formwork molding, multi-hollow | – | 220 | – |
| 1pc | With round voids | 159 | 220 | 2 |
| 1PKT | 159 | 220 | 3 | |
| 1PKK | 159 | 220 | 4 | |
| 2pcs | 140 | 220 | 2 | |
| 2PKT | 140 | 220 | 3 | |
| 2PKK | 140 | 220 | 4 | |
| 3pcs | 127 | 220 | 2 | |
| 3PKT | 127 | 220 | 3 | |
| 3PKK | 127 | 220 | 4 | |
| 4pcs | 159 | 260 | 2 | |
| 5pcs | 180 | 260 | 2 | |
| 6pcs | 203 | 300 | 2 | |
| 7pcs | 114 | 160 | 2 | |
| PG | With elliptical voids | – | 260 | 2 |
Reinforced concrete floor slabs do not occupy a dominant place in the overall construction estimate, but in terms of mass indicators this structural element cannot be discounted. At the project development stage, it is necessary to clearly calculate what loads the walls and base of the building can bear, and then make a choice in favor of one or another type of interfloor covering.
Types of reinforced concrete floor slabs
The variety of modifications of this building element is relatively small, all of them are standard, as they are produced exclusively in accordance with GOST standards. All existing types of reinforced concrete products meet safety requirements for the construction of high-rise, low-rise or industrial buildings.
- A solid floor slab is a monolithic product that does not have large internal voids. The weight of a 120 mm thick slab is from 4300 to 7100 kg. Moreover, the higher the grade of concrete, the greater the strength and weight of the floor element. The weight of a 160 m thick floor slab is up to 8700 kg.
A type of solid floor slabs is additional elements. The length of such products is standard for full-size slabs (1.8 - 5 m), but the width is much smaller, as is the weight (up to 1500 kg).
- Hollow (lightweight) floor slabs have less weight, since their body is pierced with technological holes of a certain shape. These are mainly round chambers with a diameter of 140 to 159 mm (PK1, PK2); there are types of hollow slabs with ellipsoidal chambers (PG) and different shapes (PB).
The presence of voids in the body of the slab allows the weight of standard 6-meter floors to be reduced to 3 tons. The advantage of hollow slabs is their good heat and sound insulation characteristics.
- Ribbed reinforced concrete products can be classified as monolithic, since they do not have internal cavities. These are slabs with enhanced load-bearing capacity, which they received thanks to side solid-cast ribs. Standard 6-meter slabs weigh from 1500 to 3000 kg, and industrial 12-meter “giants” reach 7000 kg.
- A floor slab made of polystyrene concrete is a lightweight version of a floor slab, where thermal insulation material is used as a filler. The strength of such slabs is slightly lower than classic reinforced concrete products, but is sufficient for loads of 400-500 kgf/cm2. The weight of polystyrene concrete slabs is two times lower than classic solid ones, while the insulating qualities are several times higher than those of conventional reinforced concrete products.
How much do different floor slabs weigh?
The weight of the slabs depends on many factors, in particular on the brand of concrete used, the number of reinforcing elements, samples, voids and other factors.
| Type of concrete products | Marking | Dimensions (m) | Weight, kg) |
| Full-bodied | PRTm-3 | 1600x400x80 | 85 |
| TP-43-8 | 4300x800x220 | 1400 | |
| PTP 24-12 | 2400x1200x120 | 840 | |
| Ribbed | 1P7-2 | 5550x740x400 | 1500 |
| 2PG-5 | 5970x1490x250 | 1230 | |
| 1P3-1 | 5550x1490x400 | 2650 | |
| Hollow | PK26.10-8 | 2580x990x220 | 78 |
| PK30.15-8 | 2980x1490x220 | 790 | |
| PK50.12-8 | 4980x1190x220 | 1320 | |
| Polystyrene concrete | 36.10.3 | 3600x1000x300 | 1150 |
| 42.12.3 | 4200x1200x300 | 1610 | |
| 51.15.3 | 5100x1500x300 | 2450 |
In the construction of permanent multi-storey buildings and structures, several types of slabs are used as interfloor floors: factory-made monolithic slabs, monolithic slabs poured directly at the installation sites and factory-made hollow floor slabs.
All other things being equal, the latter option has fundamental advantages: relatively lower weight of the hollow floor slab, saving on concrete, good thermal insulation and sound insulation qualities.
Features of hollow floor slabs GOST 9561-91
Plates are a standard product manufactured in accordance with the requirements of the current regulatory document GOST 9561-91. In accordance with the permissible sides of support, overall dimensions, as well as the dimensions and geometry of voids, products are divided into types.
Types, permissible supporting sides, hole diameters and overall dimensions of hollow floor slabs according to GOST 9561-91 are tabulated:
Table 1
| Product type | dimensions | Hole diameter, mm | Hole geometry | ||
| Length, m | Width, m | Thickness, mm | |||
| 1pc | 2,4-7,5 | 159 | round | ||
| 2pcs | 140 | ||||
| 3pcs | 127 | ||||
| 1pc | 9 | 1,1,2,1,5 | 159 | ||
| 1PKT | 159 | ||||
| 2PKT | 140 | ||||
| 3PKT | 127 | ||||
| 1PKK | 159 | ||||
| 2PKK | 140 | ||||
| 3PKK | 127 | ||||
| 4 pcs | 2,4-9,0 | 260 | 159 | ||
| 5 pcs | 6,0;9,0, 12,0 | 260 | 180 | ||
| 6 pcs | 12,0 | 300 | 203 | ||
| 7 pcs | 3,6;6,3 | 1,0;1,2;1,5;1,8 | 160 | 114 | |
| PG | 6,0;9,0;12,0 | 1,0;1,2;1,5 | 260 | Pear-shaped | |
Note. Fasteners for hollow floor slabs are specified in technical requirements drawing for a specific object. The following are used as fasteners: steel embedded parts, overhangs of steel reinforcement, cutouts, holes, etc.
The movement and installation of products is carried out using grippers, the design of which is agreed upon in each specific case. As a rule, this is a steel loop-shaped embedded product located at the 4 corners of the slab.
Marking of slabs
Material for the manufacture of hollow core slabs: heavy, silicate, lightweight concrete and reinforcing steel various classes. The type of concrete and class of reinforcement, as well as other information (dimensions, permissible load, seismic resistance, etc.) about a specific product is contained in its marking. In particular, lightweight concrete is designated by the letter “L”, silicate concrete by the letter “C”, heavy concrete is not designated. Marking example: 2PK24.10-5A-VC-C6.
Explanation of markings:
- 2PCS: hollow core floor slab 220 millimeters thick with round voids 140 millimeters in diameter, supported on two sides.
- 24: length 2,400 m.
- 10: width 1 m.
- 5: the permissible load on the slab is 5 kPa (500 kg/m2).
- A-V: rod reinforcement of class A-V is used.
- C: silicate concrete.
- C6: can be used to equip buildings with earthquake resistance up to 6 points.
How much does a hollow slab weigh?
The weight of the floor slab is indicated in the seller’s price list and depends on the dimensions and number of voids. If the developer has an old hollow core slab purchased on occasion, you can calculate its approximate weight yourself.
Let's consider the calculation technology using the following example:
Hollow core slab 2.5 m long, 1.5 m wide, 0.25 m thick, with 5 round holes with a diameter of 0.14 m. The slab is made of concrete with an average density of 2,500 kg/m3. Calculation:
- Using the formula for determining the volume of a parallelepiped, we determine the mass of a monolithic slab without holes: 2.5x1.5x0.25x2500=2343 kg. Here: 2.5 slab length, 1.5 slab width, 0.25 slab thickness, 2500 concrete density.
- Using the formula for calculating the volume of a cylinder, we determine the “mass” of one hole: 3.14x(0.14/2)2x2.5x2500=96kg. Here: 3.14 number of Pi, (0.14/2)2 radius of the hole squared, 2.5 length of the cylinder equal to the length of the slab, 2,500 concrete density.
- We determine the total weight of the “holes”: 96x5 = 480 kg. Here: 5 is the number of holes.
- We determine the weight of the slab without “holes”: 2343-480 = 1863 kg our hollow core slab weighs.
Note. Considering that the design of floor slabs of one design or another has bevels and mounting grooves, the actual weight of a particular product will be slightly less than the calculated one.
Permissible loads of a hollow floor slab
The exact calculation of permissible static loads on a floor slab is complex and is the topic of a separate publication. Within the framework of this article, an example of an enlarged calculation of the permissible load on a hollow-core floor slab will be given. As an example, consider the product 2PK24.10-5A-VC-C6.
Initial data:
- A product marked 2PK25.15-5A-VC-C6, the weight of which is calculated above. This floor slab allows a static load of 500 kg/m2.
- The total load from furniture, household members and other equipment is 50 kg/m2.
- The load from the slab’s own weight is: 1863/(2.5x1.5)=496 kg/m2.
- The total load on the slab is 496+50=546 kg/m2.
Conclusion. The 2PK24.10-5A-VC-C6 floor slab does not correspond to the actual load. A floor slab with a higher load capacity should be used.
Important note! Based on the practice of constructing buildings and structures, builders have developed a very simple calculation of the thickness of the floor slab depending on the span length. Calculation formula: distance between supports (walls) /32.
Example. The distance between the supports (walls) is 6 meters. Therefore, the thickness of the floor slab must correspond to 6/32 = 180 mm, no less.
Conclusion
Calculation of hollow floor slabs based on their applicability for the construction of buildings and structures should be carried out by specialized companies with a staff of experienced, qualified engineering personnel.
4583 09/16/2019 4 min.
Floor slabs are a very popular and inexpensive material, which allows you to complete the construction of a garage, basement, or remove the floor. To obtain such a product, reinforced concrete is used, which today is actively used in various branches of construction.
Hollow floor slabs serve great solution for covering the roof or as interfloor partitions.
Description of material
The production process is carried out in accordance with GOST 23009-78. This standard also requires special markings, which include dimensions, concrete grade and withstand load.
You can learn about how to use hollow core slabs assortment from this
The installation process is carried out using special equipment. But it is not recommended to use hollow slabs in aggressive environments. Therefore, before installing them, it is necessary to perform a qualitative calculation of the possible load on the walls.
The video shows hollow-core floor slabs and their technical characteristics:
When you have previously installed the frames for the technological holes, you can carry out direct pouring. Materials and work time must be distributed in such a way that the concrete filling process occurs continuously. Filling must be done until the formwork is completely filled.
When these steps have been completed correctly, you need to compact it, using for these purposes deep vibrator. Now you just have to wait 30 days for the concrete to completely harden. At the same time, treat the surface with water throughout the entire time.
Reinforced concrete hollow-core floor slabs are used in accordance with GOST specified
The video shows the load-bearing capacity of hollow-core floor slabs:
Price
Today, hollow floor slabs are available in a wide range. For this reason, it will not be possible to indicate the cost of each product. Let's consider the price (price) of the PK24-10-8 slab, it is 2,200 rubles, but the PC 90-15-8 slab will cost you 18,990 rubles.
Calculations
The presented products are characterized by their sizes and thickness. It is these parameters that influence their resistance to loads. To determine the load that the floor slab can withstand, you must first prepare a drawing of the house. After this, calculate the mass of everything that will be carried by the ceiling. It's worth considering here plasterboard partitions, floor insulation, cement screed, parquet flooring. Now the resulting value must be divided by total number slabs
The video shows the calculation of a hollow-core floor slab:
Let's consider calculating the load on specific example. Let's assume that a PC 60-15-8 plate will be used. According to GOST 9561-91 its weight will be 2850 kg. First, it is worth determining the area of the bearing surface of the product: 6 m × 1.5 m = 9 m2. To determine the load that the calculated area can withstand. As a result we get: 9 sq. m × 800 kg/sq.m = 7200 kg. We now get the mass of the plate itself: 7200 kg – 2850 kg = 4350 kg.
To determine the total load, it is necessary to take into account all flooring and insulation. In general, the resulting value should not exceed 150 kg/m2. As a result, 9 m2 of slab will have the following load: 9x150 = 1350 kg. The total load is determined as follows: 4350 kg – 1350 kg = 3000 kg.
The video shows what load a hollow core slab can withstand:
Series 1.141 1
Today this material is in great demand in the construction of residential and public buildings. The brand includes numbers and symbols that indicate the size of the panel and the design load. Such products are characterized high performance strength, durability, and the frost resistance level is F50. When making slabs I use heavy concrete, which is equipped with liners. In product labeling this is indicated by the letter A.
Hollow floor slabs today are in great demand when arranging residential buildings. But before you use them, you need to accurately calculate everything required parameters. This is the only way you can determine the advisability of using such material in certain conditions.
Anyone who has at least once dealt with the construction of a house knows how important hollow reinforced concrete slabs or floor panels are. Hollow-core concrete floor slabs, in fact, make up about 90% of the total weight of the house. Floor slabs (PC) can vary greatly in both weight and size, depending on the specific purposes for which they are used.
Structural features of hollow core slabs
As you might guess, the inside of reinforced concrete floor slabs (RC) are hollow, which is why they are labeled for sale as multi-hollow. But the holes inside such slabs, contrary to misconception, can have not only oval, but also round, square and other shapes.
Scheme of supporting a hollow core slab However, in most cases, floor slabs (PCs) have cylindrical hollow circles inside.
Interestingly, floor slabs (PC) can be either unreinforced or reinforced. Reinforced concrete floor slabs (PC) will be reinforced.
Such floor slabs (PCs), although they have a significantly greater weight, which ultimately increases both the load on the building and the cost of construction, however, have a large margin of safety. Installation of floor slabs, namely the installation method itself, depends on what support the slabs will be placed on, because support is also an important criterion.
For example, if the support of the slab is not stable enough, this can lead to unpleasant consequences, which, of course, must be avoided.
Scheme of laying a hollow core slab on the second floor Characteristics of hollow core slabs
Size
Its final cost also depends on the size of the hollow core PC; in addition to parameters such as width and length, weight is also important.
PC sizes vary as follows:
- the length of the PC ranges from 1180 to 9700 millimeters;
- The width of the PC ranges from 990 to 3500 millimeters.
The most popular and in demand are hollow-core panel slabs, the length of which is 6000 mm and the width of 1500 mm. The height or thickness of the panel is also important (it would be more correct to talk about height, but builders, as a rule, say “thickness”).
So, the thickness that hollow-core panels can have is always the same value - 220 mm. Great importance has, of course, the weight of the floor panel. Concrete floor slabs must be lifted by a crane with a minimum lifting capacity of 4-5 tons.
comparison table coordination dimensions of hollow core slabs The length and weight of the panels are of utmost importance for construction; length is an even less important indicator than weight.
Weight
As for such an important parameter as weight, everything is very clear the first time: the range of products produced in Russia ranges from 960 kilograms to 4.82 tons. Weight is the main criterion by which the method by which the panels will be installed is determined.
Typically, cranes are used, as noted above, with a lifting capacity of at least 5 tons (of course, cranes must lift weight with some margin).
The weight of panels with the same markings may differ, but only slightly: after all, if we consider the weight with an accuracy of one gram, anything can affect it.
Comparative characteristics main brands of hollow core slabs If, for example, a product is caught in the rain, then it will a priori be slightly heavier than the product that was not exposed to rain.
Types of loads
To begin with, it should be noted that any overlap requires the presence of the following 3 parts:
- The upper part, with the floor where people live. Accordingly, the panel will be loaded by the floor covering, various insulating elements and, of course, concrete screeds - the main component of the load;
- The lower part, with the presence of the ceiling, its decoration, lighting fixtures. By the way, you shouldn’t be skeptical about the availability of lighting fixtures. Firstly, the same LED lamps require partial destruction of the plate with a hammer drill to lay the cable. Secondly, if we take large premises, with columns and halls, huge crystal chandeliers can hang there, which will give more load than any other device or type of decoration. This must also be taken into account;
- Structural. It unites both the upper and lower parts at once, as if supporting them in the air.
A hollow core slab is a structural slab that supports both the upper and lower parts of the floor in the air!
By the way, you should not discount the dynamic load. It, as you might guess, is created by people themselves, as well as the things they move. All this affects the properties and states of the panel.
Diagram of a hollow core slab with holes For example, if you once transport a heavy piano in a small two-story house from one place to another is normal, but daily movement will create much more on a multi-hollow slab Negative influence. It is unlikely to fall, but there may be serious problems with ventilation later.
Based on the type of load distribution, they are divided into 2 groups:
- distributed;
- point.
To understand the difference between these two types, it is worth giving an example. The same huge crystal chandelier, which weighs one tone - this is a point load. And here suspended ceiling with a frame over the entire surface of the slab - this is already a distributed load.
Construction of a technological line for the production of hollow core slabs But there is also a combined load, combining point and distributed. For example, a bathtub filled to the top. The bathtub itself stands on legs, and its pressure on the legs is a type of distributed load. But the legs standing on the floor are already a point load.
Its cost directly depends on the weight of the hollow core slab.
It's complicated, but you can figure it out. And it is necessary! After all, calculations for floors and hollow core slabs during construction will still need to be made.
Brands of hollow core slabs
As a matter of fact, hollow core slabs don’t even have brands as such. We are talking about markings that reflect some parameters. It is enough to give a small example.
Scheme of laying a hollow core slab on a crossbar Let's say the panel has the following markings: PC 15-13-10 PC - means hollow core slab; All digital designations indicate any technical parameters.
15 would mean that the panel is approximately 15 decimeters (1.5 meters) long. Why approximately? It’s just that the length can be 1.498 meters, but on the marking the manufacturer has the right to round this figure to 1.5 meters (15 decimeters).
The number 12 means that the product is 10 decimeters wide. The last digit (in this case 10) is the most important indicator.
This is the load that the material can withstand (maximum permissible). In our case, the maximum load will be 10 kilograms per 1 dm². Usually builders calculate the load per square meter, here it will be 1000 kilograms per 1 m². In general, everything is not so difficult.
The panel brand always looks like PC-XX-XX; if sellers offer other options, then you should be wary.
Load calculation
Calculation of limiting impact Calculation of limiting impact - required condition
when designing a building. The dimensions and other parameters of the panels are determined by the old, good Soviet GOST number 9561-91. Construction of a hollow core slab with a reinforced screed
In order to determine the load that will be exerted on the product, it is necessary to indicate on the drawing of the future structure the weight of absolutely all elements that will “press” on the ceiling. Their total weight will be the maximum load.
- First of all, you need to consider the weight of the following elements:
- cement-sand screeds;
- gypsum concrete partitions;
- weight of flooring or panels;
thermal insulation materials.
Subsequently, all the obtained indicators are summed up and divided by the number of panels that will be present in the house. From here you can get the maximum, maximum load on each specific product.
Calculation of optimal load It is clear that the maximum- this is a critical indicator, which must not be brought to the level under any circumstances. Therefore, it is best to calculate the optimal indicator. For example, a panel weighs 3000 kg. It is needed for an area of 10 m².
It is necessary to divide 3000 by 10. The result is that the maximum permissible load value will be 300 kilograms per 1 m². This is a small indicator, but you also need to take into account the weight of the product itself, for which the load was also calculated (let’s say its value is 800 kilograms per 1 m²). From 800 you need to subtract 300, the result is 500 kilograms per 1 m².
Now you need to roughly estimate how much all the loading elements and objects will weigh. Let this figure be equal to 200 kilograms per 1 m². From the previous indicator (500 kg/m²) you need to subtract the resulting one (200 kg/m²). The result will be a figure of 300 m². But that's not all.
Diagram of a hollow core slab with waterproofing Now you need to subtract the weight of the furniture from this indicator, finishing materials, the weight of people who will constantly be indoors or in the house. “Live weight” and all elements, their load, let it be 150 kg/m². From 300 you need to subtract 150. As a result, the optimal permissible indicator will be obtained, the designation of which will be 150 kg/m². This will be the optimal load.
Advantages of hollow core slabs
Among the advantages of these products are the following:
- relatively small load on the perimeter of the entire building, in contrast to the same solid products;
- high strength indicators, despite the fact that the panels at the bottom are hollow;
- reliability;
- settlement of the house will be much less intense than when using solid products (in fact, this advantage comes from the relatively low weight);
- relatively low cost.
In general, hollow-core panels are one of the most important building materials. Today it is produced by only a few factories throughout vast Russia. The main thing, as noted above, is not to be deceived when purchasing.
Diagram of the arrangement of reinforcement blocks in a hollow-core floor slab Sometimes (this is rare, but still) sellers try to sell low-quality panels, so-called lightweight ones. For example, they may have markings indicating that the product is designed for a load of 500 kilograms per square meter, but in reality this parameter is several times lower.
This is not even fraud, it is a criminal offense that should be punished to the fullest extent of the law. After all, if you buy a panel designed for a smaller load, there is a serious risk of building collapse. This situation can be observed not only in the provinces, but even in Moscow or St. Petersburg.
In general, you need to be extremely careful when purchasing such products. It is important to remember that any design mistake can even have tragic consequences.
Video
You can watch a video where experts talk in detail about the features various types hollow slabs.
