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designing floor slabs on grade pdf

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I think it is out of print - eBay might have one but you pay a bit for it if I recall. Red Flag This Post Please let us know here why this post is inappropriate.

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Floor Slabs

Students Click Here. Related Projects. Ringo and Robert B. Anderson Second Edition thread Anderson Second Edition?? The publisher must not want to sell very many copies of that book.

No book is worth that to me. Pick up a version of CRSI; it has a grand total of 1 one page dedicated to slabs on grade. Not the most precise thing in the world but I'm guessing that the majority of slabs built in accordance with the chart on that page fared fairly well. Now if I specialized in slabs on grade I might feel differently but since I don't, I don't. Good luck with your pursuit. Thanks Archie - I have that book but it is not detailed enough for heavy fork lifts or concentrated loads I use the TM now.

Thanks again. Ok, good. I figured there would be a reason you would want the book. Have you tried ACI R? Link here. Will look for my copy for you, love the book, Great book. Will look this weekend and get back to you. I bought a copy off Scribd. It's a PDF download that you can print.A foundation is an extremely critical part of the building; it is the first part to be built, and everything that comes afterward depends on it.

Foundations come in many types, and each one has its strengths and weaknesses. Concrete slabs on grade are widely used for residential, single-family structures where the foundation is not subjected to heavy loading and is in warm climates.

designing floor slabs on grade pdf

Sometimes these slabs are adapted to cold climates by insulating their edges. Slab on grade is a misnomer, since these types of foundations invariably include turned-down edges similar to, but not as deep as, a stem wall on a foundation for a cold climate. Find out the soil type where the slab will be constructed.

Check with people who have slab foundations in the area to find out what soils they encountered. In many cases, it is a good idea to hire a geologic engineer to assess the soils and make recommendations regarding the correct foundation to use. Soils with high clay concentrations need to have the water retention tendency of the clay mitigated with a layer of gravel between the clay and the slab.

Check the soil conditions. Note any surface drainage that may cause undercutting to the slab so you can plan on either locating the slab out of the path of the water or rerouting the flow to avoid the slab.

Stony soils may limit the depth that the edges of the slab can be turned down, and that may affect the location of the slab if surface drainage poses a threat of undercutting the slab. Soils with high water content will require drainage along the perimeter of the slab. Find out the local building code requirements for foundations. The codes will specify the maximum depth of the turndowns on slabs, the insulation that should be used if adopting the slab to a cold climate, and sometimes even the soil preparation necessary for slab installation.

These codes will also specify any special requirements for seismic and wind loads in your area. Determine the building loads by consulting the building plans. Wood-framed, single-family homes of two stories or less will generally be well suited to 4-inch-thick slab on grade foundations.

Buildings that will house heavy equipment will require thicker slabs and may also require stronger concrete. Set the excavation depth for the turned-down edges based upon the soil type, soil conditions, building code requirements and building requirements. Use the same information sources to also determine the type, size and amount of gravel for below the slab and the turned-down edges. Determine the slab reinforcement. Use three or four continuous 4 rebar all around the perimeter of the slab turn-downed edge at a minimum, but final determination will depend upon local building codes.

For slabs with light loads, as those for homes, include wire mesh midway up the thickness of the slab to reduce cracking. For heavier loads consider using 4 rebar laid out in an inch by inch grid midway in the slab. Determine the concrete strength for the loads anticipated based upon seismic, wind and building loads. Concrete of psi is widely used for residential.

If your local building code office allows the viewing of previously approved building plans, you can get an idea of the kinds of slab on grade foundations that have been used in your area by studying the foundation plans for those structures. Every building location is unique, so consult professional engineers, architects or soils engineers when developing foundation designs.

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Concrete Slab Foundation - Process & Best Practices

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Magazine Social Media Sports Travel. All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you. General SOG construction consists of placing a concrete slab on the existing native soil. The existing native soil may consist of a layer of engineered fill to bring the slab to proper elevation. The existing native soil, in many instances, is. The existing native soil, in many instances, is considered the sub-base.

On top of the sub-base, the base course is compacted. This provides additional bearing support and a generally flat surface. On the flat base course, a concrete slab is constructed. The thickness of the concrete slab depends on the type of loading and the quality of the native soil on which the construction is founded.

To prevent moisture from 'wicking' up through the concrete from the native soil, often a vapour retarder is installed between the base course and the concrete slab. You can never guarantee cracking will not occur, but you can, however, minimise it with care.

For proper construction, it is necessary to specify the proper base and sub-base, concrete mix design, provide control joints, and provide a manner of curing. Concrete is a brittle material and to minimise random cracking, if the minimum dimension of the slab isgreater than 5m, it is also necessary to provide proper control joints.

The use of control joints should always be considered as part of the SOG construction.

Designing Floor Slabs on Grade

For high quality or special purpose SOG construction, review of the Work should be considered as part of the project. In many locales, there are specialty designers and contractors that work with SOG construction. SOG construction is one of the most trouble prone and litiguous elements of concrete work; care and diligence is essential.

There are several good publications for SOG construction. These should be reviewed prior to commencing a significant SOG project. Design Most SOG construction is subject to minimal, static loading and these are generally infrequent. If frequent and moving loads are encountered, then the SOG should be constructed as a pavement. Pavement design includes consideration of both flexural stresses encountered and repetitive loading.

The effect of a pattern point load may influence stresses in the concrete slab at point load locations adjacent to the load under consideration. This additional loading should be considered in the slab design.Learn more about Scribd Membership Home.

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designing floor slabs on grade pdf

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Document Information click to expand document information Description: This comprehensive book will help you select the most cost-effective approach to achieve high-performance concrete floors. Discusses a variety of slab types and different loading and support conditions. The 2nd edition includes new chapters on The Hybrid Post-tensioned Slab and Troubleshooting, plus expanded commentaries and details. Date uploaded Feb 08, Did you find this document useful? Is this content inappropriate?

Report this Document. Description: This comprehensive book will help you select the most cost-effective approach to achieve high-performance concrete floors. Flag for inappropriate content. Download Now. Related titles. Carousel Previous Carousel Next. Design of Portal Frame Buildings by S. Amrhein - Reinforced Masonry Engineering Handbook 6e.

Jump to Page. Search inside document. Related Searches Designing floor slabs on grade. Vikram Kothari. Francisco Faggioni. Ahmad Firdaus. Hung Nguyenthe. Anh Do Vo. Chris Rey. Sarah Jane Pahimnayan.The base floor within a building may simply be a cast-in-place concrete slab-on-grade with limited design considerations for structural support or environmental control functions.

The base floor may also be comprised of a mud or structural foundation slab complete with waterproofing and wearing slab with the overall system designed to carry structural hydrostatic pressure loads and maintain a controlled environment. Floor slabs are often the source of leakage into the building with slab cracking of common concrete materials being a primary cause. Issues of controlling soil gas emissions such as radon may also be of importance.

Because the cost penalty to correct a foundation or slab on grade waterproofing failure is either extraordinarily expensive up to 7 times the initial cost of waterproofing or practically impossible to correct at all after construction is complete, it is better to err on the side of caution on the initial installation.

Approach critical areas that will later be buried in construction with extreme conservatism. The recommendation is to raise the quality of approach one degree more than the existing condition reports suggest, that is, use the higher quality material and detail it with additional reinforcements and belt and suspenders precautions applied at each level of risk perceived.

This section provides specific description of materials and systems common in floor slab systems. Descriptions and guidelines are provided in the following sections:. Depending on the interior space the finish floor covering may be the exposed concrete surface itself or various floor coverings such as wood, vinyl floors or carpet.

Many adhesives used in applying floor coverings are sensitive to moisture requiring the use of a waterproof system or lengthy drying times if a poly vapor retarder is used. In typical office environments, the concrete floor slab itself is comprised of 4" to 6" thick concrete reinforced with one layer of welded wire fabric at mid depth, unless below the water table, when hydrostatic heads may exert upward pressure, requiring stronger construction.

Poly sheets are usually 15 mils thick with taped seams, edges, and penetrations. Where high water tables create contact with the slab on grade, it is necessary to waterproof the slab on grade to resist hydrostatic pressures. A mud slab can be utilized to facilitate the installation of vapor retarder membranes and waterproofing membranes. Mud slabs are usually a 2" to 3" unreinforced concrete slab with a float finish.

They provide a flat surface for the membranes, which are then fully supported and much less likely to be punctured by subsequent construction activities. The granular material serves as a capillary break and a place to "store" the water until it can be absorbed back into the surrounding soil.

How to Design a Concrete Slab on Grade

Figure 3 contains an overall schematic that characterizes the four functions i. Structural Support, Environmental Control, Finish, and Distribution as they relate to the below grade enclosure element of floor slabs.

The four function categories, i. Structural Support, Environmental Control, Finish, and Distribution, are expanded in general terms for floor slab systems. Structural Support Functions —The floor slab of the below grade building enclosure must be designed to carry downward vertical gravity loadings as well as any upward soil or hydrostatic pressure loadings.

Downward vertical gravity loadings exist from the dead weight of the floor slab and any occupancy live loads. In many deeper structures the floor slab may also be a mat foundation slab carrying significant building column and wall loads.

Floor slabs may also resist upward soil or hydrostatic pressure loadings. Upward soil pressures may be applied to the floor slab in situations where it is acting as a matt foundation and the building point loads on the foundation results in an upward pressure on the floor slab.

In areas such as crawlspaces and unoccupied basement areas the structural support component involving a concrete slab may not be needed. In these areas, environmental control functions may still need to be addressed. Environmental Control Functions —The exterior environment that the floor slab is subjected to includes environmental control loadings such as thermal, moisture, insects, and soil gas.

The interior environment that the floor slab is subjected to includes environmental control loadings such as thermal and moisture. As with foundation wall systems, the control of moisture is likely the most important environmental control function.

Design of Slab-on-Grade/Ground (SOG) Construction

Moisture control is dealt with in a drainage and barrier type of design approach. For cases with hydrostatic pressure from ground water levels the first phase of control of moisture can be accomplished through pumping and dewatering systems to artificially drive down the natural water table level. The second component of the moisture control system includes a granular aggregate capillary break layer below the floor slab to allow an area for moisture to accumulate and dissipate or to be pumped out or drained into an exit drain or sump system.

In many floor slab situations with low water table elevations or dry conditions, the granular aggregate capillary break layer with exit drain if required will control the majority of the water. There may be no need for an active pumping system. The key question that remains is whether to provide a waterproof membrane or a vapor retarder below the floor slab. A vapor retarder resists vapor migration in the absence of hydrostatic pressure.Amazing customer service, so impressed.

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