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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: Shrinkage and Creep of High Strength Concrete
Author(s): Ali S. Ngab, Arthur H. Nilson, and Floyd
Publication: Journal Proceedings
Appears on pages(s): 255-261
Keywords: autogenous healing; compressive strength; creep properties; deformation;
drying shrinkage; high strength concretes; loads (forces); shrinkage;
specimens; strains; stresses.
Abstract:Results of an experimental program on the time-dependent deformation and sustained load strength of high strength concrete are presented. Comparison with normal strength concrete under similar conditions indicates significant differences which should be accounted for in design. Sealed and unsealed specimens were subjected to uniaxial compressive stress for load periods up to 90 days. The main variables investigated included concrete strength, conditions of drying, age at first loading, intensity of load, and duration of load. It was found that creep may be much less for high strength concrete than for normal strength material, especially when specimens are permitted to dry under sustained load, as would normally be the case in structures. Shrinkage appears to be somewhat greater than for normal strength concrete. The effect of sustained compressive stress up to about one-half the short-term strength is to increase the compressive strength of both high strength and normal strength concrete. Higher sustained stress has a detrimental effect on the strength of both. Regardless of stress intensity, the ratio of sustained load strength to short-term strength is higher for high strength than for normal strength material. All behavior was correlated with progressive in ternal microcracking. Microcracking studies are reported in a separate paper.
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