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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Ault Edward Charles M.
Patton Gulyas William S. Phelan arrison Dennis W. 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.
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. These cracks range approximately from 4 in. 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.
ACI Committee Publication: 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. Although crazing cracks can be unsightly and can collect dirt, crazing is not structurally serious and does not necessarily indicate the start of future deterioration in interior slabs.
Cool aggregates and mixing water before mixing; and 5. Refer to the latest edition of ACI R for a detailed discussion of shrinkage and curling in slabs-on-ground.
Overuse of jitterbugs, vibrating screeds, and bull floats Section 8. For more information on control, causes, evaluation, qci repair of cracks in concrete structures, refer to ACI R and This is especially important when weather conditions are adverse. The Institute shall not be liable for any loss or damage arising therefrom.
The timing of concreting operations–especially finishing, jointing, and curing–is critical. 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 302.1r-4, and increasing the potential for curling. The concrete should be protected against rapid changes in temperature and moisture wherever feasible. Smith cKinney Bruce A.
When concrete is just beginning to gain strength, climatic conditions, particularly the relative humidity during the drying period in a wetting-and-drying cycle, are an cai cause of crazing. Classes 1, 2, 4, 5, and 6 2. acl
International Concrete Abstracts Portal
Protect concrete with moisture-retaining coverings Section 9. Early thermal cracking; and 5. Discontinued reinforcement at joints, thus encour- aging joints to open; and 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.
To prevent crazing, curing procedures should begin imme- diately, within minutes after final finishing, particularly after hard troweling. Contraction joints deep enough; 302.1r–04. Applica- tion of present technology permits only a reduction in cracking and curling, not elimination.
This phenomenon will continue as long as any water, heat, or both, is being released to the surroundings. Neudeck oreman Scott E. Dampen the base when no vapor retarder is used; 2.
ACI 302.1R 04 Guide for Concrete Floor and Slab Construction MyCivil.ir
Even with the best floor designs and proper construction, it is unrealistic to expect crack-free and curl-free floors. International Concrete Abstracts Portal. Classes 3, 7, and 8 2.
Ayers Jerome Kenneth L. Though usually only 1 to 3 in.
R Guide for Concrete Floor and Slab Construction
Concrete mixtures of necessary strength with the proper amount of cement and water, 302.1r–04, mixtures that do not include any ingredient, such as aggregates or admixtures, with high-shrinkage characteristics; 8.
Plastic-shrinkage cracking Sections 9. Plastic-shrinkage cracks in the still-unhardened concrete can sometimes be closed by Dusting dry cement onto a surface to hasten drying before finishing; 7. Moreover, because the drying and cooling rates at the top 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.