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.
|Published (Last):||18 April 2014|
|PDF File Size:||18.4 Mb|
|ePub File Size:||20.36 Mb|
|Price:||Free* [*Free Regsitration Required]|
This document was replaced by Contraction joints not spaced too far apart Section 3. Prevent rapid drying by one of the following: Designers should pay careful attention to the causes of cracking, and contractors need to understand floor and slab design and concrete mixture proportioning to avoid problems. To prevent crazing, curing 302.r1-04 should begin imme- diately, within minutes after final finishing, particularly after hard troweling.
This phenomenon will continue as long as any water, heat, or both, is being released to the surroundings. Even with the best floor designs and proper construction, it is unrealistic to expect crack-free and curl-free floors.
Discontinued reinforcement at joints, thus encour- aging joints to open; and Contraction joints sawn early enough; 4. Patton Gulyas William S.
International Concrete Abstracts Portal
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. Crack formation begins at the surface and continues downward for some distance, rapidly becoming narrower with depth. Phelan arrison Dennis W.
Concrete in service, however, is usually restrained by foundations, subgrade, reinforcement, or connecting members, significant stresses can develop—particularly tensile stresses.
Smith cKinney Bruce A. A newer version of this document exists. ACI does not make any representations with regard to health and safety issues and the use of this document. Adequate supervision and inspection are required for job operations, particularly those of finishing.
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. This is especially important when weather conditions are adverse.
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. 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 Properties of the surface are determined by the mixture proportions and the quality of the concreting and jointing opera- tions.
Slabs not restrained by a rutted or uneven base and changes in slab thickness; Cracking along edges where forms are not rigid; 4. Properties of the surface are determined by the mixture proportions and the quality of the concreting and jointing operations. The amount of drying shrinkage will be reduced somewhat by taking practical measures to place the concrete with the lowest possible water content. The Institute shall not be liable for any loss or damage arising therefrom.
Callas Robert J Douglas W. 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. This guide describes how to produce high-quality concrete slabs-onground and suspended floors for various classes of service. The timing of concreting operations–especially finishing, jointing, and curing–is critical.
Early thermal cracking; and 5. Reference to this document shall not be made in contract documents.
R Guide for Concrete Floor and Slab Construction
Refer to the latest edition of ACI R for a detailed discussion of cracking in reinforced and nonreinforced concrete slabs. This document is intended for the use of individuals who are competent to evaluate the significance and limitations of its content and recommendations and who will accept responsibility for the application of the material it contains. Appears on pages s: For more information on control, causes, evaluation, and repair of cracks in concrete structures, refer to ACI R and Rohrer olland Philip A.
A thorough preconstruction meeting is critical to facilitate communication among 32.1r-04 participants and to clearly establish expectations and procedures that 302.11r-04 be employed during construction to achieve the floor qualities required by the project specifications.
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. Application of present technology permits only a reduction in cracking and curling, not elimination.