再生骨材と普通骨材の混合骨材を用いた鉄筋コンクリート梁部材の付着割裂強度に関する実験的研究

概要

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This study concerns the bond splitting strength of recycled concrete beams with recycled coarse aggregate of a quality lower than that of high quality recycled coarse aggregate. Medium quality recycled coarse aggregate shows high water absorption because of the mortar remaining in the aggregate material. Thus, drying shrinkage cracks tend to occur easily in the recycled concrete. In order to suppress this drying shrinkage, this study used recycled concrete with a mixture of medium quality recycled coarse aggregate and normal coarse aggregate. The result of the study indicated that, when compared with the conventional recycled concrete in which normal coarse aggregate is completely substituted by medium quality recycled coarse aggregate, the recycled concrete with a mixture of medium quality recycled coarse aggregate and normal coarse aggregate has a higher bond splitting strength of lap splices. Further, when a drying shrinkage reducing agent was added to the recycled concrete consisting of the medium quality recycled coarse aggregate and normal coarse aggregate, the drying shrinkage was reduced and the occurrence of drying shrinkage cracks was suppressed.
社団法人日本建築学会の論文
2008-12-30