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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For more information on control, causes, evaluation, and repair of cracks in concrete structures, refer to ACI R and Cover with damp burlap or with white polyeth- ylene sheeting Section 9.
Contraction joints sawn early enough; 4. Prevent rapid drying by one of the following: Adequate supervision and inspection are required for job operations, particularly those of finishing. Dampen the base when no vapor retarder is used; 2. Classes 1, 2, 4, 5, and 6 2. The timing of concreting operations–especially finishing, jointing, and curing–is critical. 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 When the temperature is high and the sun is shining with high winds and low humidity, some method of moist curing should be used to stop rapid drying.
Classes 3, 7, and 8 2. Cracking from settlement of concrete around reinforcing bars or other embedments Sections 5.
ACI Committee Publication: This is especially important when weather conditions are adverse. International Concrete Abstracts Portal. Moreover, because the drying and cooling rates at the 3021.r-04 and bottom of the slab will never be the same, the shrinkage will vary throughout the depth, causing the as-cast shape to be distorted and reduced in volume.
Refer to Section 5. Even with the best floor designs and proper construction, it is unrealistic to expect crack-free and curl-free floors.
This document was replaced by Application of present technology permits only a reduction in cracking and curling, not elimination. Contraction joints deep enough; 3.
R Guide for Concrete Floor and Slab Construction
Dusting dry cement onto a surface to hasten drying before finishing; 7. Thus, drying shrinkage of concrete containing water reducers can still cause unsightly cracking, unless the following good practices are employed: Alternate wetting and drying of the concrete surface at early ages; 3. The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Failure to address this issue can contribute to undesirable characteristics in the wearing surface such as cracking, low resistance to wear, dusting, scaling, high or low spots, poor drainage, and increasing the potential for curling.
Plastic-shrinkage cracking Sections 9. Damage from form removal. The cracks encompass small concrete areas less than approximately 2 in. Slabs cast upon a base which has a low coefficient of friction, such as a fine-graded crushed 302.1r-4. Concrete floor slabs employing portland cement, regardless of slump, will start to experience a reduction in volume as soon as they are placed. Crack formation begins at the surface and continues downward for some distance, rapidly becoming narrower with depth.
Isolation joints provided around columns Fig. Ayers Jerome Kenneth L. This guide describes how to produce high-quality concrete slabs-onground and suspended floors for various aaci of service. Expansive clay in the subgrade; 1. Keep burlap moist until the concrete is ready for finishing.
ACI 302.1R 04 Guide for Concrete Floor and Slab Construction MyCivil.ir
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. Early thermal cracking; and 5. Slabs not restrained by a rutted or uneven base and changes in slab thickness;