Abstract
In this paper, properties of compressive strength in aging concrete are deduced from the examined data collected through the seismic diagnosis. The data were taken from examination on core samples removed from existing RC buildings. Through the statistical analyses on those data, following findings were obtained : 1. The distribution of the compressive strengths could be expressed by a log normal distribution curve. 2. The relative compressive strength expressed as percentage of the specified design strength was 1.28, and the percent defective was approximately 30 percent in average ; the former was lower and the latter was higher than those of the companion data in Kanto and Kansai districts.
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