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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Contraction joints sawn early enough; 4. For more information on qci, causes, evaluation, and repair of cracks in concrete structures, refer to ACI R and These cracks range approximately from 4 in. Adequate supervision and inspection are required for job operations, particularly those of finishing.
Cool aggregates and mixing water before mixing; and 5. A newer version of this document exists. 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.
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.
Even with the best floor designs and proper construction, it is unrealistic to expect crack-free and curl-free floors.
Application of present technology permits only a reduction in cracking and curling, not elimination. Uncover only a small area at one time, just ahead of the finishers.
Crazing cracks are very fine and barely visible, except when the concrete is drying after the surface has been wet. Refer to the latest edition of ACI R for a detailed discussion of shrinkage and curling 302.r1-04 slabs-on-ground.
Ayers Jerome Kenneth L.
Callas Robert J Douglas W. Concrete floor 30.1r-04 employing portland cement, regardless of slump, will start to experience a reduction in volume as soon as they are placed.
Dampen the base when no vapor retarder is used; 2. Plastic-shrinkage cracks in the still-unhardened concrete can 302.1r–04 be closed by Isolation joints provided around columns Fig. Cracking along edges where forms are not rigid; 4.
Guide for Concrete Floor and Slab Construction. 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. Classes 1, 2, 4, 5, and 6 2. Moreover, because the drying and cooling rates at the top and bottom of the slab will 302.1r04 be the same, the shrinkage will vary throughout the depth, causing the as-cast shape to be distorted and reduced in volume.
R Guide for Concrete Floor and Slab Construction
Concrete mixtures of necessary strength with the proper amount of cement and water, Also, mixtures that do not include any ingredient, such as aggregates or admixtures, with high-shrinkage characteristics; 8.
Prevent rapid drying by one of the following: This will provide a smooth surface on which the slab can slide Section 4.
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. Properties of the surface are determined by the mixture proportions and the quality of the concreting and jointing opera- tions.
Committee Felder John P.
Refer to Section 5. Phelan arrison Dennis W. ACI does not make any representations with regard to health and safety issues and the use of this document.
International Concrete Abstracts Portal
Failure to address this issue can contribute to undesirable characteristics in the wearing surface such as cracking, low resistance to wear, dusting, scaling, high zci low spots, poor drainage, and increasing the potential for curling. Reference to this document shall not be made in contract documents. Uneven support by a poorly prepared subgrade, subbase, or base; poor drainage; or uneven support due to curling of slab edges Section Thus, drying shrinkage of concrete containing water reducers can still cause unsightly cracking, unless the following good practices are employed: