Evaluation of Alkali-Silica Reactivity Using Aggregate Geology, Expansion Limits of Mortar Bars and Concrete Prisms, and Kinetic Model

The main objective of this study was to evaluate and classify the alkali-silica reactivity of thirteen aggregate groups using aggregate geology, and early and extended expansion limits of mortar bars and concrete prisms submerged in the 1N NaOH for 4, 8 and 13 weeks. The previously suggested ASR kinetic model, known as Kolmogorov-Avrami-Mehl-Johnson (K-A-M-J) model, was fitted with the prism expansion data over the test durations of 4, 8 and 13 weeks, and a new failure criteria was developed to better predict the degree of reactivity of the trial aggregates. The ASR classifications of the investigated aggregates evaluated by the failure criteria of alkali-cured prisms and ASR kinetic model were in good agreement with the results generated from the failure limits of mortar bars and from aggregate potential reactivity based on aggregate type.