Development of Solidification Technique for Recycle of Concrete Wastes by Hydrothermal Hot-Pressing and Its Mechanical Property

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  • NAKANE Yuji
    Research Institute for Fracture Technology, Faculty of Engineering, Tohoku University
  • SATO Kazushi
    Research Institute for Fracture Technology, Faculty of Engineering, Tohoku University
  • TAKAHASHI Hideaki
    Research Institute for Fracture Technology, Faculty of Engineering, Tohoku University
  • YAMASAKI Nakamichi
    Research Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi University
  • HASHIDA Toshiyuki
    Research Institute for Fracture Technology, Faculty of Engineering, Tohoku University

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Other Title
  • 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
  • スイネツ ホット プレスホウ ニ ヨル コンクリート ハイザイ ノ コカタイ

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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 hydrothermal conditions using an autoclave. The reaction temperature was in the range of 120 to 300°C, and the reaction time was in the range of 10 to 40min. The tensile strength of the solidified concrete waste was determined by a Brazilian test. It was shown that concrete waste can be solidified under the above reaction conditions. The measured tensile strength increased with increasing temperature, and a steep increase was observed at the reaction temperatures of 150 to 200°C. The tensile strength of 5MPa was achieved above 200°C. The steep increase in the tensile strength was shown to be due to the formation of tobermorite.

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