水化硅酸钙晶种对CaO-SiO2-H2O蒸压体系强度的影响及其机理分析*

doi:10.11896/j.issn.1005-023X.2017.014.026

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Abstract The effect of calcium silicate hydrate seed on the CaO-SiO₂-H₂O hydrothermal reaction was studied. Calcium silicate hydrate seed were prepared by hydrothermal synthesis with lime and nano silica under different thermal conditions. Chemical analysis method was used for the determination of reactive degree of fly ash. The effect of calcium silicate hydrate seed on types and morphology of hydration products was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM-EDS). The distribution of pore size was investigated by mercury intrusion porosimetry (MIP). The results indicated that the compression strength of CaO-SiO₂-H₂O autoclaved system increased most obviously when mixed with calcium silicate hydrate and synthesized under the 150 ℃ with calcium silica ratio of 1.0. Calcium silicate hydrate seed promoted dissolution of SiO₂PPP from fly ash and decomposition of hydrogarnet, and accelerated the generation of hydration products (mainly C-S-H(B) and tobermorite). Meamwhile, the pore structure was refined and the distribution of the pore size was more uniform with the addition of calcium silicate hydrate. The addition of calcium silicate hydrate caused the number of pores below 50 nm increase and the number of pores above 200 nm decrease, compared with the reference sample.

Key words： calcium silicate hydrate seed crystals autoclaved silicate products fly ash degree of hydration

Published: 04 May 2018

CLC number:

TU 528

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	Articles by authors
	ZHANG Haidong
	WEI Jiangxiong
	ZHAO Zhiguang
	YU Qijun
	LI Fangxian

Cite this article:

ZHANG Haidong,WEI Jiangxiong,ZHAO Zhiguang, et al. Influence of Calcium Silicate Hydrate Seed on Compressive Strength of CaO-SiO₂-H₂O Autoclaved System and Its Mechanism Analysis[J]. Materials Reports, 2017, 31(14): 122-126.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.014.026 OR http://www.mater-rep.com/EN/Y2017/V31/I14/122

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