Ribbed and waffle slabs types, advantages, disadvantages. The tt slab consists of an upper board and two longitudinal ribs. Reinforcing steel for slabs is primarily parallel to slab. Method of statement construction of flat concrete floor.
Slab construction a construction technique in which clay is rolled into thin sheets and manipulated into shapes. Waffle slab or ribbed slab construction procedure and. Data is taken from manufacturers tables yield strength of steel, f. Construction joints should be worked into the overall joint plan, where they can also function as contraction joints. Slabs are constructed to provide flat surfaces, usually horizontal, in building floors, roofs, bridges, and other types of structures. What are the 16 different types of slabs in construction. Construction detail in a 105 mm wall, with s and flat profiles. For socalled shotcrete applications such as tunnel linings and swimming pools, the concrete mixture is blown under high pressure through. The code recommends that the ribs should have a width bw not greater than 100 mm. Nervi, ribbed slabs, isostatics, floor systems, computational tool. Findotek date rev no prepared by checked by approved by remarks. Slab foundations are often laid over soilbased areas. For spans over 9 m posttensioning should be considered.
Reported by committee 302 american concrete institute. Structural ribbed concrete slabs the cupolex floor slab can be fully or partially suspended on piles, stem walls or gradeedge beams. It is applicable to the construction of normalweight and structural lightweight concrete floors and slabs made. All the electrical appliances can be installed easily in the gap of the ribs which can be architecturally aesthetic.
A slab pour requires efficient planning so that all of the elements that go into producing a highquality slab are done in time before the concrete sets and done correctly. These bulkheads are often used as screed rails during placement and finishing of the slab. Singh central building research institute, roorkee, india abstract flyash is a major industrial waste which pollutes the atmosphere. Concrete construction how to build high quality slabs on. Twoway joist concrete slab floor waffle slab system. A type of precasting used in building construction involves casting floor and roof slabs at or near ground level and lifting them to their final position, hence the name liftslab construction. Gallery of the tallest residential building in the world is coming to new york city 3. The attached excerpted resource materials have been made. The construction and design of concrete slabs on grade d. The reason why, concrete and steel are used together to construct rcc slab, is in their individual properties as separate building materials and their individual limitation. The use of flat slab building provides many advantages over conventional rc frame building in terms of architectural flexibility, use of space, easier formwork and shorter construction time. Slab system for construction of commercial buildings. If these are not available, use a bat or board covered in sturdy canvas. After the blinding is casted and placement of waterproofing is done, the preparation and casting for slab on grade shall be done.
Ribbed slabs types and its advantages in construction. They have been found in pyramids, the ruins of babylon and the ruins of ancient greek cities, according to design boom. Slip suspension of clay in water, used as a glue or for decorating. The aim of this study is to demonstrate that oneway ribbed slab with lightweight foam concrete can be used to reduce the dead load on slab concrete structure. A slab foundation is a foundation that is made of a concrete slab. Eliminating drops results in simpler falsework and formwork arrangements, enabling rapid floor construction and giving maximum flexibility to the occupier. There are 16 different types of slabs in construction. Slabonground construction is the most commonly used method for residential floor construction as it provides an even, durable, waterproof, maintenance free structure. Flatslab construction definition is reinforcedconcrete floor construction not requiring beams and girders to transmit the floor load to supporting columns. Pdf comparison between ribbed slab structure using. Fix the reinforcement steel as per the approved drawings, sometimes a393 brc mesh is indicated in the drawing and most commonly use in 250mm thick concrete grade slab.
In reality, sandwich slabs are ribbed slabs with a slab placed both to their upper and lower surface. Filler slab technology is a simple and a very innovative technology for a slab construction. The ribbed floor slab systems of pier luigi nervi form finding lab. While the wheel provides a way to quickly and efficiently produce multiple round forms, handbuilding allows me to slow down and enjoy the whole clay experience in a much more relaxing way. Wedging the process by which air pockets are forced out of the clay and the clay is mixed. Pdf construction live loads on slab formworks before. Your foundation should be leveled, consistent and in accordance with the local building code. A rc filler slab with nonautoclaved cellular concrete. Rib and block slabs installation by royal concrete slabs. This is another useful construction video tutorial presented by sami ullah stanikzai, the renowned engineer. The two remaining concrete slabs were supported on compacted fill pads. The construction and design of concrete slabs on grade. In addition, i enjoy the ability to add textures and decoration at every step of the forming process from soft slab to leather. Reusable formwork in abs technopolymer for oneway ribbed slabs.
Use of costeffective construction technologies in india. Waffle slab grid slab it is a type of reinforced concrete slab that contains square grids with deep sides. This is an important section to read prior to ordering. Costs represent work that progressed during a 2year time cost and time study for.
We, like many in the industry, have struggled to get consistently level slabs and reduce the amount of money spent on floor leveling products. Construction joints are formed using some sort of bulkhead, made of wood, steel, plastic, or precast concrete. For underwater construction, the concrete is placed in a large metal tube, called a tremie, with a hopper at the top and a valve arrangement at the submerged end. Slab construction 1 roll out the slab to approximately ikinch with a rolling pin using guide sticks to assure even thick ness. Concrete slab construction requires great deal of preparations prior to the actual pouring concrete slab which should be part of slab on grade design as well as concrete slab insulation if extreme hot and cold is to be considered in your area. Architecture symbols architecture design simple workbench plans brutalist design door jamb house information wood exterior door door detail diy door. In this article, ill give a detailed explanation of each slab where to use particular slab. Identifying cracks in slabs concrete construction magazine. Construction live loads on slab formworks before concrete placement. Waffle slab or ribbed slab construction procedure and advantages. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Carbon dioxide, produced from burning of fossil fuels, is the principle greenhouse gas and efforts are being.
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. Concrete slab construction, pouring a concrete slab. Slab thickness of ribbed or waffle slabs is less than other slab systems. The spacing between the ribs should be in general 2030 inch. The lateral loads are independently resisted by shear walls. One of the most vital steps in the home construction process is the foundation of the building. Pdf ribbed slabs have been widely used in buildings due to their many. From that experience, our teams of architects, engineers, and construction managers have developed the following steps to improve slab levelness results.
In this video, sami shows in detail how to estimate the quantity of cement, sand and aggregate for a concrete slab. These elements can also be recovered after use, saving time and money. Things we learned along the way how are slabs poured in the home construction process. Pdf comparison study for various structural slab systems ismaiel. For cracks through the concrete, it is also important to know if the crack is active or moving. Comparison between ribbed slab structure using lightweight foam concrete and solid slab structure using normal concrete. Form and reshore loads were measured over a complete construction cycle for two highrise slab. Ribbed or waffle slabs are an easy solution for this purpose. Some of them are outdated and many of them are frequently used everywhere. Use of costeffective construction technologies in india to mitigate climate change nilanjan sengupta concentration of greenhouse gases play major role in raising the earths temperature. Learn what is a jamb and how to measure the width of your door jamb.
This document is intended for the use of individuals who are. The slab may be supported by walls, by reinforced concrete beams usually cast monolithically wit. Construction joints in concrete slabs the concrete network. Once the site waste management requirements have been assessed and implemented, the slab area is prepared by removing all vegetation, levelling the surface, excavating the. The total cure time allowed for the slab was five full days. A renaissance of form by lyla goldstein forget the mug, making a cup and saucer is a return to style and class. Ceramic slabs, also called ceramic tiles, are any tile made out of clay and have been around for 4,000 years. To this end, visits were made to con struction sites and slab manufacturing plants, and interviews were held with designers, manufacturers, construction site engineers, builders and workers helpers, bricklayers, and master builders. 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. Structural steel composite slab 1 of 7 rev design project. Method statement for pouring concrete on slab on grade. Concrete floor slabs may be in situ or prefabricated. New nautilus allows for the construction of flat intrados with spans up to 1516 m, while skydome spans are smaller roughly 14 m but still create an aesthetic finish.
Ribbed slabs oneway joists introducing voids to the soffit of a slab reduces dead weight and increases the efficiency of the concrete section. Ou tmb element manufactures ribbed slabs with prestressed reinforcement product. At this stage, it is good practice to revisit the concrete slab cost estimate used during planning and budgeting stage. The slab is propped at the centre during construction stage. A slightly deeper section is required but these stiffer floors facilitate longer spans and provision of holes. A new simplified procedure to estimate loads on slabs and. Column rcc reinforced cement concrete column is a structural member of. Ceramics definitions chandler unified school district.
Although there are more sophisticated ways, a simple clear plastic crack comparator is often all thats needed. The method of proof rolling well help us to know whether the full layer of soil is able to behave as a supporting system i. The thickened concrete slab edge must extend at least eighteen inches below finished grade, be at least twelve inches in width, and provide a slab height of at least six inches above finished grade. Construction of slabs on ground design considerations aci. Because of the ribs and double reinforcement, it is more stable and recommended for larger span slabs or foundations. The cross section of the profiled sheeting is shown in fig. Join veejay gahir for an indepth discussion in this video basic slab construction, part of surfacing an f1 wheel in alias. Waffle slab construction process includes fixing forms, placement of pods on shuttering, installation of reinforcement between pods, installation of steel mesh on top of pods, and pouring of concrete. Recover your resources reduce, reuse, and recycle construction and demolition materials at land revitalization projects w h a t s i n d y o u r u. The slab is the flange of the beam and the extended part is the web. Slab foundations can also be purchased and laid in concrete blocks. Work on plaster board sheet rock, drywall board to keep the slabs flat and to absorb the moisture in the clay. This guide presents information relative to the construction of slabonground and suspendedslab floors for industrial, commercial, and institutional buildings. Asce, secb course content slab on grades construction.
Slab construction process concrete slab construction methods. Liftslab construction is a precast method of construction of slab on the ground and then lifting it to the structure. Concrete slab types construction, cost, and applications. One of the most comprehensive resources available for designers, contractors and facility owners that can help them avoid potential debacles during concrete floor construction is the american concrete institute aci guide to floor and slab construction. Waffle slab or ribbed slab is a structural component which is plain on its top and contains grid like system on its contents. A rc filler slab with nonautoclaved cellular concrete blocks for sustainable construction m. The stem walls retained compacted fill material for support of the concrete slabs. 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. Concrete is good in taking compression and steel is good in tension. How are slabs poured in the home construction process. Introduction concrete slabs on grade are a very common type of concrete construction. Reinforced concrete ribbed slabs with widebeam lajes. The attached excerpted resource materials have been made available for use. A new simplified procedure to estimate loads on slabs and shoring during the construction of multistorey buildings article in engineering structures 335.
Check the adequacy of the continuous composite profiled deck slab with spans of 3. They provide an easy method of setting a base foundation by simply pouring the slab foundation mixture over the area and leaving it to harden. Ribbed or waffle slab is a slab system which consists of series of parallel reinforced concrete t beams framing into reinforced concrete girders. System for the construction of lightened bidirectional slabs with flat intrados and.
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