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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: Microcracking of Plain Concrete and the Shape of the Stress-Strain Curve
Author(s): Thomas T. C. Hsu, Floyd O. Slate, Gerald M. Sturman, and George Winter
Publication: Journal Proceedings
Appears on pages(s): 209-224
Abstract:Internal cracking of plain concrete observed directly with a microscope and with x-ray photographs is reported. Cylinders were axially loaded in compression to various strains from 0 to 0.0030. Thin slices were made from the strained specimens, and internal cracks examined by newly-developed techniques. Cracks at the interface between coarse aggregate and mortar are widespread even in nonloaded concrete. These bond cracks are preponder-ate at all stages of straining, while mortar cracks begin to increase noticeably, and bridge between bond cracks to form continuous crack patterns at loads of about 70 to 90 percent of ultimate. This condition leads to a descending stress-strain curve and eventual disruptive failure. Correlationwith previous investigations by others is shown. Hypotheses concerning the relation between microcracking and the shape of the stress-strain curve are presented.
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