Since 1983 numerous pavements statewide have exhibited various degrees of ASR. In addition, Sioux quartzite, the primary coarse aggregate used in eastern South Dakota, has proven to be reactive. The impact of ASR on concrete durability and pavement life and the need to develop strategies to minimize the risk of premature deterioration of PCC pavements prompted further research. Because the use of lithium salts is a recognized method of mitigating potential ASR in new concrete, SDDOT participated in the Strategic Highway Research Program (SHRP) Concrete and Structures ASR Showcase Test and Evaluation Project 34 Mitigation of Potential Alkali-Silica Reactivity Using Lithium. This work involved the construction of new concrete test sections incorporating various lithium admixtures as well as treatment of a series of 500-foot test sections on an ASR affected severely deteriorated pavement with several dosage levels of lithium nitrate and acetate solutions in 1995. Monitoring of these test sections over the last five years has provided strong evidence of the beneficial effects of lithium treatments on ASR in existing pavements. It has also led to the development of strategies designed to monitor in situ changes in pavement properties that reflect a reduction in the magnitude of expansive stresses. A paper detailing these results, which was presented at the 11th International Conference on Alkali-Aggregate Reaction in June 2000, is attached. The work did not directly address determining the optimum point for applying the treatment or evaluating its cost benefit ratio. This research should address these issues.