Evaluation of test methods for alkali-aggregate reactivity

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ConferenceAlkalis in Concrete: Research and Practice, Danish Concrete Association. PROC. 6TH INT. CONF.: 22 June 1983, Copenhagen, Denmark
Pages30314; # of pages: 290
Subjectaggregates; alkalinity; test procedures; reactivity; concrete (materials); alkali; aggregate; evaluation; chemical, petrographic tests; expansivity measurement; Concrete
AbstractTest methods for alkali-aggregate reactivity can be divided into those that determine the potential reactivity of aggregate (the chemical test and the proposed petrographic method for determining the undulatory extinction angle of quartz) and those that purport to measure the expansivity of an aggregate in concrete (concrete prism, mortar bar, and rock cylinder methods). Several modifications have been developed for the chemical method, ASTM C289, to take into account regional variations in aggregates. The main disadvantages of the methods measuring expansion is that they take a long time. To try to overcome this problem, various methods of acceleration have been proposed, varying from immersion of the samples in salt solution at an elevated temperature to autoclaving. Autoclaving methods must be regarded with some caution, however, because at elevated temperatures and pressures hydrothermal reactions occur that do not take place at atmospheric pressure.
Publication date
PublisherThe Road Directorate, Denmark, Publ., G.M. Idorn, S. Rostam, Eds.
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number23749
NPARC number20378981
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Record identifierece430be-5fd0-4dbf-94b0-dd855ba4d1c6
Record created2012-07-24
Record modified2016-05-09
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