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Cement-aggregate reaction in concrete of a canadian bridge

From National Research Council Canada

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SubjectBridges; Concrete; concrete admixtures; bases (chemistry); expansion; cement; freeze thaw cycles
Abstract
A study was made of a concrete bridge deck which had expanded abnormally over a period of more than 25 years. The two deck sections involved, many with different aggregate, were found to have been affected by different types of cement-aggregate reaction. One section had been seriously affected by alkali-aggregate reaction involving mainly a phyllite in the coarse aggregate, but the actual expansion and extensive deterioration of the concrete was attributed in large part to freezing and thawing under adverse moisture conditions. A feature of this case was the failure of the mortar bar test to reveal potential reactivity in the source material in spite of other evidence. Some possible explanations are considered. In the second section, abnormal expansion was probably due to the sand component which was shown to be reactive in the Conrow test, ASTM Method C 342.
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  • Proceedings of the American Society of Testing and Materials (1 July 1958): 1043–1056.
LanguageEnglish
Peer reviewedNo
IdentifierDBR-RP-59
NRC numberNRCC 4592
NRC-IRC-383
NPARC number20375069
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Record identifiercdc36f49-0c1c-4aed-a668-91e76d632ada
Record created2012-07-23
Record modified2023-12-18
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