Testing Canadian aggregates for alkali expansivity

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ConferenceProceedings, 1976 Alkali Symposium: 1976-09, London, England
Pages227245; # of pages: 19
Subjectconcrete admixtures; chemical tests; alkalinity; prismatic shape; Concrete; adjuvant; essai chimique; alcalinite; forme prismatique
AbstractThe applications of the chemical test ASTM C289, the mortar bar test C227, a modification of it, the rock prism test, and the rock cylinder test C586 to selected Canadian aggregates are discussed. The chemical test C289 is shown to be unsatisfactory. The concrete prism test proved to be the most satisfactory, but it took up to two years to obtain results and its use is therefore impractical in many instances. A new accelerated test is proposed--The Rock Prism Test--a modified form of ASTM C586. Thin prisms of rock are vacuum saturated in alkali and the length change with time is recorded; results are obtained in about three months. Tests on similar rocks by the rock cylinder method C586 took up to two years. The new test would be useful for preliminary screening of potential aggregates to determine which would need further testing by the mortar bar or concrete prism methods.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number16086
NPARC number20378941
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Record identifier44e5ed3d-c5c9-4b9e-a733-6b9e69367599
Record created2012-07-24
Record modified2016-05-09
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