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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: Fracture Energy of Concrete: Its Definition and Determination From Size Effect Test
Author(s): Z. P. Bazant and P. A. Pfeiffer
Publication: Special Publication
Appears on pages(s): 89-110
Keywords: concretes; cracking (fracturing); energy; failure; mortars (material); statistical analysis; Structural Research
Abstract:The previously derived size-effect law for concrete may be used to define the material fracture parameters in a less ambiguous, size-independent manner. By exploiting the size-effect law, the fracture characteristics can be defined for an extrapolated infinite specimen size, for which they must be independent of the specimen geometry. It is demonstrated experimentally that this definition yields less scattered results for the fracture energy than the existing methods. Three very different types of specimens, including three-point bent, edge-notched tension, and eccentric compression specimens, are found to yield approximately the same fracture energy values. Furthermore, the R-curves calculated from the size effect measured for various types of specimens are found to have approximately the same final asymptotic values for very long crack lengths, although they differ very much for short crack lengths. Finally, certain refinements of the size-effect law are discussed and their consequences pointed out, particularly with regard to the effect of aggregate size.
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