The quality of recycled aggregate derived from construction byproducts was recently standardized in the Japanese Industrial Standards (JIS). The JIS classifies recycled aggregate into three grades mainly by its absorptivity. Among the three grades, high-quality recycled aggregate is specified to be handled as having a quality level equivalent to that of ordinary aggregate, and low-quality recycled aggregate is assumed not to be used for structural concrete. This study discusses the long-term drying shrinkage properties of beams with medium-quality recycled coarse aggregate for two years after placement of the concrete. The authors also showed that substituting normal fine aggregate with melt-solidified slag aggregate with lower absorptivity derived from wastes can suppress drying shrinkage. In this study, beams were prepared using melt-solidified slag aggregate in order to alleviate drying shrinkage. Some of the beams were stored indoors at room temperature, and others were subjected to field exposure and observed regularly for two years to identify the occurrence of drying shrinkage cracks.
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