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Effect of Starting Materials on the Synthesis of Tobermorite

Published online by Cambridge University Press:  15 February 2011

Hiroyoshi Sato  and
Michael Grutzeck
Hiroyoshi Sato
Affiliation:
Visiting Scientist from Asahi Chemical Industry Co., Ltd.
Michael Grutzeck
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
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Abstract

The effect of starting materials on the synthesis of tobermorite was studied using29Si MAS and CPMAS NMR Spectroscopy. Three Q2 and one Q3 peak were identified during the crystallization of tobermorite from C-S-H. C-S-H, which had a Ca/Si ratio >1, crystallized readily because this C-S-H consists of dimer and short chains of silica tetrahedra. This occurred whenever quartz was used as a starting material. C-S-H, which had a Ca/Si ratio <1 was harder to crystallize because this C-S-H consists of long and cross-linked chains of tetrahedra. The latter was observed when amorphous silica was used as a starting material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 245: Symposium K – Advanced Cementitious Systems: Mechanisms and Properties , 1991 , 235
Copyright
Copyright © Materials Research Society 1992

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References

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