Investigation of concrete expansion in Nova Scotia

From National Research Council Canada

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Author	Search for: Duncan, M. A. G.; Search for: Swenson, E. G.
Format	Text, Article
Subject	Concrete; concrete (materials); concrete admixtures; expansion; crackings (breaking); cement
Abstract	Excessive expansion and cracking of some concrete in Nova Scotia, which were first observed over 25 years ago by the Nova Scotia Power Commission in some of its dams, have been shown by laboratory and field studies to be a form of alkali- aggregate reaction. Test rocks were selected on the basis of use and probable use as concrete aggregates. Length change tests were carried out on concrete beams and mortar bars using high and low alkali cements, and on rock cylinders immersed in alkali solution. Petrography was employed to relate rock type to expansion of test specimen, and to relate performance of field concrete to laboratory test results by examination of cores. Rock types found to produce excessive expansivity, as indicated by preliminary length change results, include mainly some Meguma greywackes and phyllites, impure quartzites and quartz-mica schists. In this preliminary report, however, the conclusions are to be taken as tentative.
Publication date	1969-10-01
In	Professional Engineer in Nova Scotia 10, no. 2 (1 October 1969): 16–19.
Language	English
Peer reviewed	No
Identifier	DBR-TP-309
NRC number	NRCC 11015 NRC-IRC-2540
NPARC number	20374798
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Record identifier	ad70a407-9fec-45a4-8eba-f989d6835bf5
Record created	2012-07-23
Record modified	2024-01-29

Date modified:: 2024-07-17