The relationship between the crack density and compressive strength of the core cylinder, which drilled from actual structure damaged by ASR, was investigated. The results showed that even if the crack density increased about 1.0m/m
2, the compressive strength decreased only 2N/mm
2. Then, the new method for estimating future compressive strength using the accumulation crack density in the current is proposed. In addition, the declining tendency of compressive strength by the ASR expansion was early proportional to the expansion, and it was examined on the reason for becoming gentle curve afterwards. As a technique, the detailed observation of ASR crack which arose in the loading test for the plane was carried out, after cylindrical specimen for test was cut in longitudinal direction. As the result, It was proven that the proportion in which line of rupture overlaps with the ASR crack was low, and the load is resisted by interlocking between coarse aggregate and concrete in the crack plane.
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