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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: A New Look at Tensile Creep of Fiber-Reinforced Concrete
Author(s): S. A. Altoubat and D. A. Lange
Publication: Special Publication
Appears on pages(s): 143-160
Keywords: basic creep; curing; drying creep; early age behavior; fiber reinforcement; restrained shrinkage; shrinkage cracking; shrinkage stress; steel fibers; tensile creep
Abstract:Creep of concrete is composed of basic and drying creep components, and the drying creep is primarily caused by two mechanisms: stress induced shrinkage and microcracking. The effects of steel fibers on basic creep, stress induced shrinkage, and microcracking components for two concrete mixtures with w/c of 0.4 and 0.5 are discussed. The steel fibers were found to enhance the basic creep mechanisms and reduce the drying creep mechanisms. The reduction in drying creep offsets the increase in basic creep leading to a net tensile creep similar for both plain concrete and FRC; a conventional conclusion that usually obscures the role of fibers on shrinkage stress relaxation and cracking. A new look that is consistent with material behavior is introduced by dividing the creep mechanisms into beneficial aspects associated with real creep mechanisms and detrimental aspects associated with apparent creep mechanisms (microcracking). Basic creep and stress-induced shrinkage are real creep mechanisms associated with deformation of hydration products, while microcracking is detrimental because of the associated microstructural damage. Steel fibers tend to enhance the beneficial mechanisms and reduce the detrimental ones, thus enhancing the overall performance. The results explain the difference in shrinkage cracking between plain concrete and FRC; an insight that would not be achieved by looking at total tensile creep alone.
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