Accelerator for Shotcrete Based Amorphous Calcium Aluminate

by Satoru Teramura, Denki Kagaku Kogyo K.K Special, Cement Additive Dept, Tokyo, Japan,
Yoshihisa Matsunaga, Denki Kagaku Kogyo K.K Special, Cement Additive Dept, Tokyo, Japan,
Kenkichi Hirano, Denki Kagaku Kogyo K.K Special, Cement Additive Dept, Tokyo, Japan,
Minoru Handa, Denki Kagaku Kogyo K.K Special, Cement Additive Dept, Tokyo, Japan,
Etsuo Sakai, Denki Kagaku Kogyo K.K Special, Cement Additive Dept, Tokyo, Japan,



Document Type: Proceeding Paper

Part of: Shotcrete for Underground Support VI

Abstract: The authors developed an accelerator based on amorphous cacium aluminate named NATMIC for shotcrete. In Japan, accelerator based amorphous calcium aluminate are widely used in shotcrete of NATM. By using of this accelerator which produces C2AH8 at the initial hydration on itself, compressive strength of shotcrete is increased at early stage. And, the long-term stability and compressive strength of concrete with this accelerator are not decreased compared with ordinary concrete. The amounts of rebound and dust of shotcreting with this accelerator are also discussed.

Subject Headings: Calcium | Shotcrete | Compressive strength | Hydration | Dust | Chemical additives | Japan | Asia

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