Proposal of Sustainable Recycle System of High Quality Recycled Aggregate with Blast-furnace Slag Cement

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In this research, in order to contribute to sustainable recycle system of high quality recycled aggregate with blast-furnace slag cement, how to improve crack resistance of slag cement concrete was investigated.The main results of this study are as shown below.(1) The effectiveness of the use of lightweight fine aggregate to reduce shrinkage of concrete and to improve crack resistance of slag cement concrete was exhibited.(2) The method to analyze microcrack around aggregate with Acoustic Emission Method was established. AE technique was utilized for very early age concrete under high temperature history. The mechanism of the generation of microcracking was clarified and the properties of microcracking were examined in detail.(3) The method to analyze microcrack of externally restrained concrete with AE was developed. The cracking strength of restrained specimens was much lower than the tensile strength of unrestrained specimens. The reason was investigated with AE analysis.