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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: Influence of Fiber Reinforcement on
Restrained Shrinkage and Cracking
Author(s): R. N. Swamy and H. Stavrides
Publication: Journal Proceedings
Appears on pages(s): 443-460
Keywords: cracking (fracturing); crack width and spacing; drying shrinkage; fiber reinforced concretes; fibers; glass fibers; metal fibers; shrinkage; synthetic fibers; tensile stress; tests.
Abstract:Drying shrinkage, when restrained, contributes to nearly all the cracking observed in concrete members before loading. A free shrinkage test cannot therefore give the true potential of fiber reinforcement to resist restrained shrinkage stresses and to control shrinkage cracking. A ring type of restrained shrinkage test is reported to demonstrate the ability of short, discrete fibers such as polypropylene, glass, and steel to control cracking and resist tensile stresses arising from restrained shrinkage. Three series of free and restrained shrinkage tests are reported with different matrices, types of fibers, and fiber contents. It is shown that the presence of fibers exercises a clear but small restraint to free shrinkage, and reduces drying shrinkage by up to 20 percent. When shrinkage is restrained, fiber reinforcement delays the formation of the first crack, prevents sudden failure observed with unreinforced matrices, enables the composite to suffer multiple cracking without failure, and reduces crack widths substantially. The fiber reinforced specimens were able to resist 50 to 100 percent more tensile stresses, and continued to resist the shrinkage stresses even after 8 to 12 months.
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