水熱ホットプレス法によるコンクリート廃材の固化体合成技術の開発と評価に関する研究

概要

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A new processing method for solidifying pulverized concrete wastes is presented. The objective of this study was to develop a technology to recycle concrete wastes. Concrete wastes were pulverized and then solidified by a hydrothermal hot pressing method, which is a press forming technique under hydrother mal conditions using an autoclave. The reaction temper ature was in the range of 120 to 300℃, and the reaction time was in the range of 10 to 40 min. The tensile strength of the solidified concrete waste was deter mined by a Brazilian test. It was shown that concrete waste can be solidified under the above reaction condi tions. The measured tensile strength increased with in creasing temperature, and a steep increase was ob served at the reaction temperatures of 150 to 200℃. The tensile strength of 5 MPa was achieved above 200℃. The steep increase in the tensile strength was shown to be due to the formation of tobermorite.
1994-04-01