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ACI 302.1R-04 PDF

Guide for Concrete Floor and Slab Construction. ACI R FOREWORD. The quality of a concrete floor or slab is highly dependent on achieving a. Veja grátis o arquivo ACI R 04 Guide for Concrete Floor and Slab Construction enviado para a disciplina de Concretos Especiais Categoria. Home · Standards & Codes · ACI; R Guide for Concrete Floor and Slab Construction. R Guide for Concrete Floor and Slab Construction.

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Acl 3, 7, and 8 2. Committee Felder John P. Surface moisture evaporates faster than it can be replaced by rising bleed water, causing the surface to shrink more than the interior concrete.

Slabs cast upon a base which has a low coefficient of friction, such as a fine-graded 30.1r-04 stone. Plastic-shrinkage cracking Sections 9. Adequate supervision and inspection are required for job operations, particularly those of finishing.

Adequate supervision and inspection are required for job operations, particularly those of finishing. Classes 1, 2, 4, 5, 302.1r-004 6 2. Sprinkling water onto the surface of a slab during finishing. Isolation joints provided around columns Fig. Early thermal cracking; and 5.

Slabs not restrained by a rutted or uneven base and changes in slab thickness; Water reduction through use of admixtures—water-reducing admixtures meeting ASTM CTypes A and D, and air-entraining admixtures—has little effect on drying shrinkage Ytterberg ; Martin and Phelan ; Whiting and Dziedzic Refer to the latest edition of ACI R for a detailed discussion of shrinkage and curling in 302.1d-04.

Application of present technology permits only a reduction in cracking and curling, not 320.1r-04. Refer to Section 5. Cracking from settlement of concrete around reinforcing bars or other embedments Sections 5.

R Guide for Concrete Floor and Slab Construction

Reference to this document shall not be made in contract documents. A thorough preconstruction meeting is critical to facilitate communication among key participants and to clearly establish expectations and procedures that will be employed during construction to achieve the floor qualities required by the project specifications.

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It emphasizes aspects of construction such as site preparation, concreting materials, concrete mixture proportions, concreting workmanship, joint construction, load transfer across joints, form stripping procedures, finishing methods, and curing.

Phelan arrison Dennis W. Avoid the use of a vapor retarder where not needed. Dusting dry cement onto a surface to hasten drying before finishing; 7. ACI Committee Publication: The concrete should be protected against rapid changes in temperature and moisture wherever feasible. This guide describes how to produce high-quality concrete slabs-onground and suspended floors for various classes of service.

Even with the best floor designs and proper construction, it is unrealistic to expect crack-free and curl-free floors. Uneven support by a poorly prepared subgrade, subbase, or base; poor drainage; or uneven support due to curling of slab edges Section These cracks range approximately from 4 in. Alternate wetting and drying of the concrete surface at early ages; 3. This will provide a smooth surface on which the slab can slide Section 4.

ACI 302.1R 04 Guide for Concrete Floor and Slab Construction MyCivil.ir

Slabs not strongly restrained at their perimeters by bond of floor or slab concrete to foundation walls or other construction, or by tying-in reinforcement to foundations, docks, and tilt-up walls Section 3. The term map cracking is often used to refer to cracks that are similar to crazing cracks only more visible and involving larger areas of concrete. Concrete in service, however, is usually restrained by foundations, subgrade, reinforcement, or connecting members, significant stresses can develop—particularly tensile stresses.

Crack formation begins at the surface and continues downward for some distance, rapidly becoming narrower with depth. Uncover only a small area at one time, just ahead of the finishers.

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Contraction joints not spaced too far apart Section 3. Callas Robert J Douglas W. Concrete floor slabs employing portland cement, regardless of slump, will start to experience a reduction in volume as soon as they are placed.

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Cover with damp burlap or with white polyeth- ylene sheeting Section 9. The American Concrete Institute disclaims any and all responsibility for the stated principles. They are similar to mud cracking in shape and in generation. This document was replaced by Damage from form removal.

Expansive clay in the subgrade; 1. Designers should pay careful attention to the causes of cracking, and contractors need to understand floor and slab design and 302.1t-04 mixture proportioning to avoid problems. Discontinued reinforcement at joints, thus encour- aging joints to open; and Premature floating and troweling Section 8.

Concrete mixtures of necessary strength with the proper amount of cement and water, Also, mixtures that do not include any ingredient, ac as aggregates or admixtures, with high-shrinkage characteristics; 8. Refer to the latest edition of ACI R for a detailed discussion of cracking in reinforced and nonreinforced concrete slabs. Guide for Concrete Floo FOREWORD The quality of a concrete floor or slab is highly dependent on achieving a hard and durable surface that is flat, relatively free of cracks, adi at the proper grade and elevation.

Applica- tion of present technology permits only a reduction in cracking and curling, not elimination. Prevent rapid drying by one of the following: Even with the best floor 30.1r-04 and proper construction, it is unrealistic to expect crack-free and curl-free floors. Neudeck oreman Scott E.

Properties of the surface are determined by the mixture proportions and the quality of the concreting and jointing operations. ACI does not make any representations with regard to health and safety issues and the use of this document.