弱碱环境下硅灰复合硅酸盐胶凝材料体系硫酸盐侵蚀产物

doi:10.11896/j.issn.1005-023X.2017.024.006

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Abstract The composite silicate cementing systems with 0%, 5% and 10% (mass fraction) cement replacement ratio by silica fume were immersed in 10% (mass fraction) sodium sulfate and weak alkaline solution for 210 d, the attack products and contents were studied. The attack products were characterized by XRD, SEM and EDS. The contents of gypsum in composite silicate cementing system with silica fume were calculated by using K value, the contents of free and total sulfate ion in composite silicate cementing system with silica fume were determined by spectrophotometry. The results show that the main attack products of composite silicate cementing system with silica fume are gypsum and ettringite in 10% sodium sulfate and weak alkaline solution, and the formation of attack products causes the specimen to expand and crack. The contents of free and total sulfate ion and the attack product in composite silicate cementing system with silica fume obviously decrease, and the expansion rates decrease with the increase of silica fume. Silica fume has a certain improvement effect on the expansion of composite silicate cementing system with silica fume.

Key words： weak alkaline sodium sulfate Portland cement silica fume attack product

Published: 25 December 2017 Online: 2018-05-08

CLC number:

TB321

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	Articles by authors
	LI Yan
	YANG Xuguang
	SUN Daosheng
	WANG Aiguo
	LIU Kaiwei

Cite this article:

LI Yan,YANG Xuguang,SUN Daosheng, et al. Sulfate Attack Product of Composite Silicate Cementing System with Silica Fume in Weak Alkaline[J]. Materials Reports, 2017, 31(24): 26-29.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.024.006 OR https://www.mater-rep.com/EN/Y2017/V31/I24/26

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