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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: Relaxation of Stress in Concrete and
Its Relation to Creep
Author(s): J. J. Brooks and A. M. Neville
Publication: Journal Proceedings
Appears on pages(s): 227-232
Keywords: coarse aggregates: creep properties; creep recovery: creep tests; expanded clay aggregates: expanded shale aggregates; fly ash; lightweight aggregate concretes;regression analysis: stress relaxation: stress relaxation tests;stresses: water-cement ratio.
Abstract:Stress relaxation data have been obtained for a range of lightweight aggregate concretes. For mixes having equal cement paste content, the loss of stress at any time is approximately proportional to the initial stress and inversely proportional to strength at the time of application of load. The process of stress relaxation at a constant strain is faster than creep under a constant stress, and, from an analysis of data of other investigators, the re-laxation ratio and creep coefficient appear to be related by an expression which is sensibly independent of the aggregate type, the mix proportions, and the storage environment. This relation can be accounted for by the rate of creep method when an allowance is made for creep recovery.
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