氯盐-硫酸盐共存环境中杂散电流作用下提升砂浆中氯离子结合性能的研究

doi:10.11896/cldb.20060128

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Abstract Metro concrete immersed in groundwater not only suffers from the dual corrosion of chloride and sulfate but also generally sustains stray current corrosion, leading to severe corrosion to the buried metal along the track and the reinforcement in the concrete structure. Existing research generally agrees that it is the free chloride ions remaining in the pore solution that causes the corrosion of the steel bar. When the chloride ions cannot be objectively prevented from invading the interior of the concrete structure, improving the binding capacity of the chloride ions can effectively reduce its harm to the reinforced concrete. In this work, the best combination scheme for enhancing the chloride binding capacity of the metro concrete is proposed by reasonably selecting mineral admixtures, types of polymers, and their corresponding amounts. The content of bound chloride ions was determined by potentiometric titration, and the optimized binding performance of the chloride ions in concrete was characterized utilizing XRD, SEM, and DTG. The results are indicated that metakaolin has the prior in the improvement of chloride ion binding capacity under stray current than silica fume, and fly ash micro-sphere outperforms zeolite powder. Also, the specimen mixed with 10% metakaolin, 20% fly ash micro-sphere, and 1.5% PVA re-dispersible emulsion powder has the best chloride binding capacity. The compounding of mineral admixtures and polymers significantly improves the binding capacity of chloride ions inside the specimen.

Key words： stray current chloride binding capacity mineral admixture polymer

Published: 30 September 2021

CLC number:

TB304

Fund:This work was financially supported by Primary Research & Developement Plan of Jiangsu Province (BE2020780) and the National Natural Science Foundation of China (51778209).

About author:: Hongqiang Chu is a professor and Ph. D supervisor at Hohai University. He received his B.E. degree at Hohai University in 2001 and obtained his Ph.D. from Tongji University. He once visited University of Colorado for one year. He is mainly engaged in research work on high-performance concrete and its durability, electrochemical repair technology of concrete, and the inspection and evaluation of engineering structures.

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	CHU Hongqiang
	WANG Tingting
	ZHANG Yuheng
	DING Tianyun
	LIANG Yunchao
	ZHU Zhengyu

Cite this article:

CHU Hongqiang,WANG Tingting,ZHANG Yuheng, et al. Study on Improving Chloride Binding Capacity in Mortar Under Stray Current in Chloride-Sulfate Coexisting Environment[J]. Materials Reports, 2021, 35(18): 18069-18075.

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http://www.mater-rep.com/EN/10.11896/cldb.20060128 OR http://www.mater-rep.com/EN/Y2021/V35/I18/18069

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