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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: Chemical and Physical Properties of Cement Paste and Concrete Containing Fly Ash After Hydrothermal Exposure
Author(s): J. Kropp, J. Seeberger, and H. K. Hilsdorf
Publication: Special Publication
Appears on pages(s): 201-218
Keywords: cement pastes; chemical analysis; concretes; fly ash;
hydration; hydrothermal reactions; microcracking; physical
properties; porosity; strength.
Abstract:Concrete subjected to elevated temperatures may suffer considerable loss in strength due to the development of microcracks or phase transformations in the matrix. The prevailing mechanism depends on the type of aggregate as well as on the moisture content of concrete. Experiments on different hydrated cement systems showed that under hydrothermal conditions phase transformations in neat cement paste lead to an increase in porosity and reduction in strength. In cement pastes containing fly ash or ground quartz in sufficient amounts, gel-like compounds are formed in pozzolanic reactions during hydrothermal exposure. An increased specific surface area as well as an increase in strength is observed. Concrete exposed to hydrothermal conditions is affected by these phase transformations of the matrix; a loss in strength can be prevented by addition of fly ash or ground quartz. Due to a higher shrinkage of the modified matrix which causes increased microcracking these concretes, however, show a loss in strength when drying during temperature exposure.
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