Recently identified occurrences of concrete deterioration resulting from alkali-silica reactivity (ASR) have prompted an effort to evaluate Virginia aggregates for their susceptibility to this reaction. The aggregates thus far associated with ASR have been metamorphic rocks of varied composition and quartzose sands and gravels in which the reactive constituents are believed to be microcrystalline or strained quartz. These forms of quartz are present in many aggregates from Virginia. A review of the literature suggests that although the traditional tests (ASTM C227 and C289) for identifying aggregates susceptible to ASR are not effective with aggregates containing microcrystalline or strained quartz, ASTM P214, which is a new method, is promising. To evaluate P214's effectiveness, tests have been conducted on aggregates from Virginia, and the results are being compared with field performance and other relevant information. The results thus far indicate that expansions in P214 may be caused by both ASR and alkali-carbonate reactivity and that current P214 criteria are not suitable for aggregates in Virginia. Further experience with the method is necessary to determine whether suitable criteria can be established to discriminate between nonreactive aggregates and reactive aggregates containing microcrystalline or strained quartz.