The purpose of this method is to determine the susceptibility of cement-aggregate combinations to expansive reactions involving alkalis (sodium and potassium). These are determined by measuring the linear expansion that occurs in mortar bars stored under prescribed test conditions. Note 1: The alkalis involved in expansive reactions are generally derived from cement; Under some circumstances, they may be derived from other constituents of the concrete or from external sources. Two types of alkaline reactivity of aggregates are recognized: (1) an alkali-silica reaction involving certain silica rocks, minerals, and artificial glasses and (2) an alkali-carbonate reaction involving The dolomite that is found in certain calcitic dolomites and dolomitic limestones intervenes. The method does not recommend it as an adequate procedure - to put this last reaction in fvidtnoia.
NORVEN 76-39-1965 history
1965NORVEN 76-39-1965 Determination of potential alkalinity of cement mixtures (mortar stick method)