Investigation of concrete expansion in Nova Scotia

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Journal titleProfessional Engineer in Nova Scotia
Pages1619; # of pages: 4
Subjectconcrete (materials); concrete admixtures; expansion; crackings (breaking); cement; Concrete
AbstractExcessive 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
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number11015
NPARC number20374798
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Record identifierad70a407-9fec-45a4-8eba-f989d6835bf5
Record created2012-07-23
Record modified2016-05-09
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