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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: X-Rays for Study of Internal Structure and Microcracking of Concrete
Author(s): Floyd O. Slate and Stanley Olsefski
Publication: Journal Proceedings
Appears on pages(s): 575-588
Abstract:Use of x-radiography for studying the internal structure of concrete is described and discussed. Thin slices of concrete are sawed out of a mass and irradiated. Radiographs provide a permanent record for further study. Miscrocopic examination of stained specimens is used as a companion method and as a check. . Both methods revealed cracks formed during drying (and possi ble carbonation), almost exclusive1 Y at th e interfaces between aggregate andes. These mortar, predominantly on larger aggregate cracks were observed in concrete not subjected to any prior loading. In concrete subjected to large compression strains, bond cracking at the interfaces was observed to be areatlv increased, with additional cracks through mortar- bridging between bond cracks. Internal segregation of unhardened concrete is also observable (on the hardened concrete) by this technique. The x-ray‘technique described is a powerful new tool for study of the internal structure, and changes in the internal structure, of concrete.
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