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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 of Concrete Subjected to Cyclic and Sustained Loading
Author(s): Surendra P. Shah and Sushil Chandra
Publication: Journal Proceedings
Appears on pages(s): 816-827
Keywords: cement pastes; compressive stress;concretes; crack propagation; creep properties;cyclic loads; deformation; failure mechanisms;microcracking; research; strains; ultrasonic tests;volume change.
Abstract:To study the mechanics of failure of concrete subjected to slowly applied cyclic or sustained stresses, sealed specimens of paste and concrete were tested under the maximum cyclic or sustained compressive stresses of 60 to 90 percent of the ultimate stress. Volumetric strains, ultrasonic velocity and attenuation, and internal microcrack propagation were examined. Sustained or cyclic loading resulted in progressive crack propagation. For stresses lower than 70 percent of the ultimate, when failure did not occur within the test duration, cracks propagated at a relatively slow rate. This crack growth was called Stage I. Stage II crack growth was associated only with failure and was characterized by a faster growth rate of microcracks, a sharp increase in volume dilation, and rapid changes in ultrasonic measurements. Crack growth under sustained stresses appeared to result from the phenomenon of stress corrosion while under cyclic loading the process of load repetition seemed to play an important role. Sustained loading also had a strengthening effect on concrete, probably because of the consolidation of the hardened cement paste.
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