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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: Effect of Strain Gradient on the Stress-Strain Curve of Motar and Concrete
Author(s): Llewellyn E. Clark, Kurt H. Gerstle, and Leonard G.
Publication: Journal Proceedings
Appears on pages(s): 580-586
Keywords: cracking (fracturing);microcracking;mortars (material);plain concrete;strains; stress-strain relationship
Abstract:Recent investigations have indicated that the microcracking of concrete and the associated stress-strain curve depend on the strain gradient. It is also recognized that the time rate of straining affects the stress-strain curve. The relative significance of these two effects, strain rate and strain gradient, has not previously been investigated. An experimental procedure was developed which provided for the individual control of bending and axial loads permitting maintenance of a constant strain gradient under uniform strain rates, making it possible to separate these two effects. Rectangular prisms of two different materials, mortar and concrete, were tested. The results indicate that the effect of a strain gradient on the stress-strain curves of mortar and concrete is minimal, except that the presence of a strain gradient tends to increase the maximum strain that can be reached before crushing occurs.
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