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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
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.
Title: Properties of Concrete and Their Influence on Prestress Design
Author(s): Raymond E. Davis and G. E. Troxell
Publication: Journal Proceedings
Appears on pages(s): 381-391
Keywords: no keywords
Abstract:Of the various properties of concrete that have to be taken into consideration in prestre,ss design, there are three that merit special attention: (1) the necessity. for uniformity of quality of concrete throughout a prestressed member, (2) the desirability of employing a concrete for which the drying shrinkage will be low, and (3) the desirability of employing a concrete for which the creep under the action of prestress will be low. Factors which influence the degree of uniformity and magnitude of drying shrinkage and creep are discussed and suggestions made concerning the use of materials and practices which may be expected to lead to most favorable results. To secure uniformity, there is required a concrete mix that is more than ordinarily plastic and sticky, and which when vibrated will flow readily into place without segregation and bleeding. Close job control is required with respect to grading of materials, batching, USC of admixtures, mixing, trans-porting, and placing. Other things being equal, within the ordinary range of richnesses of mix, drying shrinkage of concrete is nearly proportional to the quantity of mixing water employed; creep is proportional to the quantity of hardened cement paste and the water-cement ratio. To keep these effects at a minimum, it is , desirable that the paste content be the minimum and the water-cement ratio be the minimum which will produce,a fresh concrete of the desired properties and a hardened concrete of the desired strength. Additional factors affecting shrinkage and creep include cement composition; grading, maximum size, and character of aggregates; admixtures (affecting uniformity as well as shrinkage); size of prestressed members; and others.
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