Evaluation of ASR potential in Wyoming aggregates and development of mitigation protocol

Alkali-Silica Reactivity (ASR) is a concrete deterioration problem requiring rapid and accurate classification methods and identification of sufficient mitigation measures. This research investigates the classification of eight Wyoming aggregate sources using boosted and unboosted field exposure, the Concrete Prism Test (CPT), and the Accelerated Mortar Bar Test (AMBT). Good correlation was found between field exposure and CPT results. Aggregates were classified in three groups: nonreactive, moderately reactive, and highly reactive. Preliminary research was also conducted using an ultra-accelerated Autoclaved Concrete Prism Test (ACPT). The ACPT test shows promise as a rapid test; results are compared with CPT and AMBT results. Baseline mitigation effectiveness for reactive aggregate sources was evaluated using the Mitigated Concrete Prism Test (MCPT) and the Mitigated Accelerated Mortar Bar Test (MAMBT) using 25 percent Class F fly ash replacement. This treatment was determined to be effective for all the aggregates tested.