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The Hydration and Calcination Mechanism of Calcium Aluminate-Based Ultra-High Strength Cement with Calcium Sulphoaluminate Compound

Published online by Cambridge University Press:  21 February 2011

Iwao Mino ,
Etsuo Sakai ,
Asaaki Nishioka  and
Masaki Daimon
Iwao Mino
Affiliation:
Denki Kagaku Kogyo K. K. Research Center, 3-5-1 Asahi-cho Machida-shi, Tokyo, 194, Japan
Etsuo Sakai
Affiliation:
Denki Kagaku Kogyo K. K. Research Center, 3-5-1 Asahi-cho Machida-shi, Tokyo, 194, Japan
Asaaki Nishioka
Affiliation:
Denki Kagaku Kogyo K. K. Research Center, 3-5-1 Asahi-cho Machida-shi, Tokyo, 194, Japan
Masaki Daimon
Affiliation:
Dept. of Inorganic Materials, Tokyo Institute of Technology, 2-12-1 Ookayama-cho Meguro-ku, Tokyo, 152, Japan
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Abstract

The hardening shrinkage of calcium aluminate based ultra-high strength cement becomes nearly zero by using calcium sulphoaluminate compound, and very high bending strength can be obtained by calcinating at 300°-600°C. The starting materials are calcium aluminate, silica fume, calcium sulphoaluminate compound and superplasticizer, and the water-to-power ratio is 0.15–0.25. The main hydration products are C3AH6, AH3, C-S-H and ettringite, forming a densely packed structure, together with a large amount of unreacted cement particles. The hardening shrinkage is remarkably reduced, because of the ettringite formation in the early stage. The bending strength is about 55 MPa when calcined at 600°C. C12A7 is identified by XRD; needle-shaped skeletons of ettringite crystals are observed by SEM. It is suggested that chemically bonding substances are C12A7, amorphous A12O3, and C-S-H in calcined calcium aluminate based DSP with ettringite.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 179: Symposium Y – Specialty Cements with Advanced Properties , 1989 , 193
Copyright
Copyright © Materials Research Society 1991

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References

1. Bache, H. H., Presented at the Second International Conference on Superplasticizers in Concrete, Ottawa, Canada (1980); WO 80/00959 (15 May 1980); WO 81/03170 (2 November 1981).Google Scholar
2. Mino, I. and Sakai, E., Proceedings of the MRS International Meeting on Advanced Materials, 13, 247 (1988).Google Scholar