Abstract
The deleterious phenomenon in concrete due to alkali–silica reactivity of an aggregate can be evaluated by an accelerated mortar bar test. This study investigates the individual and combined effect of solution concentration, cement alkali and test duration on expansion, and proposes expansion models consisted of the above-mentioned three parameters. The specimens of this study were prepared from six aggregates having different mineralogy, and three dosages of cement alkalis of 0.42, 0.84 and 1.26 % Na
2
O
eq
. They were submerged in three concentrations (1.0, 0.5 and 0.25 N) of NaOH solution, and were tested at 14, 28, 56 and 98 days. The results showed that the major contributions to expansion were due to solution concentration, followed by test duration and cement alkali.