コンクリート再生骨材の諸性質と再生骨材使用コンクリートの強度・耐久性に関する研究

Abstract

Properties of recycled aggregates made of concrete, and strength and durability of concrete using the recycled aggregates are clarified in this study. In the experiment, three kinds of recycled aggregates were used, namely, primary recycled aggregate (recycled aggregate produced crushing concrete specimens made in laboratory), secondary recycled aggregate (marketed recycled aggregate) and AIT recycled aggregate (recycled aggregate produced crushing debris obtained from the demolished concrete structure in AIT). Density, absorption, grading, crushing value and particle shape of the recycled aggregates were investigated. And compressive strength, flexural strength, freezing and thawing test of the concrete using the recycled aggregates were carried out, and interfacial zone of recycled aggregates was also observed under a polarizing microscope. In the result, the particle shape of the recycled aggregate was better than that of natural crushed stone aggregate. Bond between recycled aggregate and cement past was good adhesion because of unhydrated cement and irregular surface on recycled aggregate particle.