A slab may appear dry but actually have a detrimental level of moisture passing through it. A concrete slab is a common structural element of modern buildings, horizontal slabs of steel reinforced concrete, typically between 10 and 50 centimeters thick, are most often used to construct floors and ceilings, while thinner slabs are also used for exterior paving. They are either oneway spanning systems known as ribbed slab or a twoway ribbed system known as a waffle slab. The ribbed floor slab systems of pier luigi nervi form finding. I guess any number such as the rh in slab is better than no number. Reported by committee 302 american concrete institute. Moisture problems plague flooring from concrete slabs fg. Slabs represent a significant consumption of concrete in the case of buildings with multiple floors. Basement floor slabs with integral footings must provide for 5000 psi concrete in that portion of the slab acting as a footing. The historical discussion includes the evolution of the floor slab from a nonstructural element to an inspired structural. Ive used mapei 795 built in the adhesive by formula moisture reducer, the barrier under slab is best, then you get an rh of the slab, then the next is the topical barrier, and least is the adhesivebarrier mix. This paper presents an historical and analytical evaluation of the ribbed floor slab systems developed by the italian structural artist pier luigi nervi 18911979. Concrete floor slabs on grade are subjected to a variety of loads and loading conditions. Steelreinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving see below.
In many domestic and industrial buildings, a thick concrete slab supported on. Standard practice for preparing concrete floors to receive. Under floor heating is a popular build consideration when using a concrete slab. I do know that the house has a concrete slab foundation, and i suspect that there is not a substantial subfloor between the concrete and the laminate, but i am not sure yet. A floor is usually made of ribbed slabs with hollow blocks concrete or clay or polystryrene infills. Slabs for detached garages with a thickened edge acting as the footing must provide for 5000 psi concrete in that portion of the slab acting as the footing. Such a grid of beams reduces the span of the slab and thus permits the designer to reduce the slab thickness. Crown floor slab can also be used in this application where a mineral wool product is preferred. What is the importance of a reinforced concrete slab.
A ribbed slab, giving considerable extra strength on one direction. Just goto travis perkins and ask them for slab expansion strips. This type of construction is structurally efficient because it exploits the tensile resistance of the. The single most important element of warehouse construction is the quality of the floor. The laundry room just has concrete and there is little if any difference in the floor level with the rest of the house.
Flooring materials for passive solar floor slab designs where direct solar gain and passive solar heat storage are desired. Floor slab the floor slabs, also colloquially referred to as filigree floors or halffinished slabs, are used in residential and industrial construction. Ribbed floor slab beam structure building technology scribd. If the slab is too thick, it costs more than it should. My research into compiling this assignment has led to the opinion that creating a floor, whatever materials, mean and location require careful consideration and experienced professional analysis of what is required of the floor, what it is intended to be used for and what materials. The lateral loads are independently resisted by shear walls.
Pdf the ribbed floor slab systems of pier luigi nervi researchgate. Guide to concrete floor and slab construction reported by committee 302 dennis c. Minimum slab thickness of rc slab to prevent undesirable. The slab which is provided above the normal floor level at a height of 200mm to 300mm and filled with coal or broken pieces of bricks called sunken slab. This paper presents an historical and analytical evaluation of the ribbed floor slab systems developed by. The cupolex floor slab can be fully or partially suspended. Concrete flooring is popular in this room because it is durable and easy to clean. Recommendations in the new edition of the aci guide to floor and slab construction apply to every kind of concrete floor. Nowadays approximately 40% of all new multi storey buildings fig. Floors can be quickly and easily constructed because the. For all of its strength and durability, concrete slab construction is a delicate thing. Lightness of the new slab structure is therefore an essential argument. Waffle slab twoway pan joist twoway joist slab, also called a waffle slab.
Thats a large number of hardwood for a failure, again. Seismic control research of the multiribbed slab structure using. Table 1 climafoam xps board under slab insulation wall stud depth mm climafoam thickness mm 90 140 1. While more than twice the cost, because of the sum of the rebar, reinforced concrete slabs with cages are strong enough to hang and still support weight above. For cutting the shape into the ground, use a spirit level to cut the dimensions. A floating floor is the perfect companion for a concrete subfloor. Functional requirements of ground floors construction essay. The site is benched and the beams formed into the excavation. The slab which is provided below the normal floor level at a depth of 200mm to 300 mm and filled with broken pieces of bricks is called sunken slab. Elements of engineering a damn good industrial floor part 1 posted september 23, 2015 by amy manghelli. The distribution of floor loads on floor beams is based on the geometric configuration of the beams forming the grid. The construction loads on the composite slab during concreting is composed of the weight of worker, fresh concrete, pipelines, formworks and load bearing elements, weight of small equipments, and impact.
Installation can be completed within very short time period. What is the best type of flooring to install on a slab. Flooring choices for use over concrete slabs using thermal. Guide for concrete floor and slab construction aci 302. Ribbed slabs are made up of wide band beams running between columns with narrow. The goal is installation of a flooring systemsubgrade, subbase, vapor retarderbarrier, concrete slab and possibly reinforcement, coating or flooring adhesive, and floor coveringthat satisfies performance requirements.
Tributary areas many floor systems consist of a reinforced concrete slab supported on a rectangular grid of beams. Its typically used when stiffness is important or if there are abnormally heavy loads. The design procedure separately includes determining thickness of slab under wall load. To achieve this set a sacrificial floor drain 5mm below floor height and finish concrete 3 4 mm above floor drain. The design procedure includes determining slab thickness based on moving live loads and then checking adequacy of slab thickness for stationary live load. Waste water pipes must be left protruding from the slab as we cut them off level with the slab during the polishing. Reinforced concrete ribbed slabs with widebeam lajes. Twoway joist concrete slab floor waffle slab system analysis and design design the concrete floor slab system shown below for an intermediate floor with partition weight of 50 psf, and unfactored live load of 100 psf. Ensure cement is worked around drain to ensure tight encased drain.
Additional reinforced internal ribs are then used in the slab by introducing pontex, the structural cupolex accessory to provide a structure capable of spanning between foundations or piles. Does the ground bearing floor slab align with the project summary sheet and foundation design. Sandwich slab reinforcement details in reality, sandwich slabs are ribbed slabs with a slab placed both to their upper and lower surface. It is also inexpensive, which is a benefit for homes. Many flooring suppliers offer a kit that can be very useful, as it includes rubber shims to provide proper spacing between the wall and the new floor during installation and a rubber tappingblock for use with installing clicklock flooring. Flooring choices for use over concrete slabs using thermal mass, what finish flooring materials are best to use over a concrete floor slab to retain the thermal mass properties of the slab. Climafoam xps board concrete slab insulation guide. The attached excerpted resource materials have been made.
What determines the most suitable flooring is your budget and where the flooring is being installed. Slab can be utilized immediately after installation. Ribbed floors consisting of equally spaced ribs are usually supported directly by columns. Ribbed and waffle slabs provide a lighter and stiffer slab than an equivalent flat slab, reducing the extent of foundations. Because there are joists in both directions, this floor system is the strongest and will have the least deflection. The ease of durability is also making concrete a popular bathroom floor choice. This kind of floor performs well, resists moisture and is easy to install. The anchor design tensile strength shall be calculated from 17. Structural ribbed concrete slabs the cupolex floor slab can be fully or partially suspended on piles, stem walls or gradeedge beams. A number in parentheses indicates the year of last reapproval.
Ribbed slabs oneway joists introducing voids to the soffit of a slab reduces dead weight and increases the efficiency of the concrete section. Composite floor decking constructalia arcelormittal. Twoway joist concrete slab floor waffle slab system. Floor slab article about floor slab by the free dictionary.
According to flooring experts, the best kind of wood flooring to use with a concrete subfloor is a floating engineered wood floor. They are either oneway spanning systems known as ribbed slab or a twoway ribbed system known as a waffle slab it consists of a floor slab, usually 510cm thick, supported by reinforced concrete ribs. Floor slab construction information sheet 1 types of floor slab construction stiffened raft slab a stiffened raft slab is a reinforced concrete slab that is poured directly on to the ground with concrete external edge beams and internal beams. Ribbed floor slab beam structure building technology. This tool can be used by designers in the conceptual design phase to develop ribbed floor systems inspired by nervi.
This form of construction is not very common because of the formwork costs and the low fire rating. Sandwich slabs may have the disadvantage of a larger weight compared to the ribbed ones but on the other hand, they have the advantage that their spans and supports behave in the same proper way. Would be much cheaper than radiators and gives the added possibility of solar heating. Cutting the shape into the ground method or by making a timber frame.
Slab thickness is a major factor in the cost of a concrete floor, so theres often pressure, which can become intense, to make the slab as thin as possible. A slightly deeper section is required but these stiffer floors facilitate longer spans and provision of holes. Pdf comparison study for various structural slab systems ismaiel. Reinforced concrete slab is the most popular floor slab system used in residential building construction in sri lanka. Slabs are usually used in floor and roof construction. For moment and for determining the distribution steel, put. Standard practice for preparing concrete floors to receive resilient flooring1 this standard is issued under the. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. Reinforced concrete solid slabs can be either oneway spanning or two way. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. Yes no continues on reverse ground bearing floor slabs general is the proposed slab a minimum of 100mm thick. Placing the floor slab put a mortar layer on the top course of the bricks.
In this space textured techniques can be used to ensure that the surface is slip resistant even when wet. I would also suggest wet under floor heating if your looking to heat the place. Pdf the ribbed floor slab systems of pier luigi nervi semantic. It can be sealed against moisture damage and made virtually impervious to staining agents. The time required for slabs to dry out sufficiently so that floor coverings and finishes are not adversely affected ranges from six weeks to six months. Moisture passing through the slab can carry damaging alkaline salts from the ground or concrete itself. Concrete slab on grade thickness analysis for slab. They provide a very good form of construction where slab vibration is an issue, such as laboratories and hospitals. About to start another solid oak install over sog and this time would like to float the subfloor to avoid penetrating the vapor barrier. Pdf this paper presents an historical and analytical evaluation of the ribbed floor slab systems developed by the italian structural artist pier. Details of underfloor and floor edge insulation and cavity insulation, where relevant if information is unavailable request its provision. As stacking heights have increased, floor quality has become even more critical. It is essentially a twodimensional reinforced or nonreinforced cement. Installing floating subfloor over slab on grade the.
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