超高性能水泥基材料复合盐侵蚀研究:合成Friedel盐和钙矾石在硫酸盐和氯盐溶液中的稳定性<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.023.019

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Abstract Pure Friedel salt (3CaO·Al₂O₃·CaCl₂·10H₂O, main corrosion product of cement-based materials by chloride ions) and ettringite (AFt, 3CaO·Al₂O₃·3CaSO₄·32H₂O, main corrosion product of cement-based materials by sulfate ions) were chemically synthesized and then characterized via X-ray diffraction and TG-DSC test to investigate their stabilities and transform mechanism. The interaction between different corrosion ions was explored by immersion experiment. The results indicated that sulfates have a significant impact on Friedel salt, as sulfate ions can substitute for chloride ions in Friedel salt and convert Friedel salt into ettringite. Chloride salts can also react with ettringite, leading to ettringite's decomposition. There is an equilibrium between Friedel salt and ettringite, and the inter-transform of them can be achieved under certain conditions. The study verified the interaction effect during the corrosion process of the compound solution of chloride salt and sulfate toward hardened cement paste.

Key words： Friedel salt ettringite compound salt solution transformation interaction sulfate chloride

Published: 08 May 2018

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TU528

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	Articles by authors
	GUO Liping
	ZHANG Jian
	CAO Yuanzhang
	ZANG Wenjie

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GUO Liping,ZHANG Jian,CAO Yuanzhang, et al. A Study for Compound Salts Attack on Ultra-high Performance Cement-based Materials: the Stabilities of Chemically Synthesized Friedel Salt and Ettringite in Solutions of Sulfates and Chloride Salts[J]. Materials Reports, 2017, 31(23): 132-137.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.023.019 OR http://www.mater-rep.com/EN/Y2017/V31/I23/132

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