盐渍土环境下钢筋混凝土腐蚀劣化行为及竞争失效分析

doi:10.11896/cldb.22010281

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Abstract Aiming at the serious problem of structural damage of reinforced concrete in the areas with saline soil in the west, we uses soil samples from the areas with severely saline soil in Golmud as electrolytes instead of traditional salt solutions to simulate the actual corrosive environment in saline soil areas and conducts accelerated corrosion tests by employing electrical current. The corrosion-induced deterioration behavior of reinforced concrete in saline soil environment was evaluated by electrochemical parameters, degree of damage, rate of mass loss and corrosion cracking morphology observation. The effective evaluation index of performance deterioration of reinforced concrete was selected, and the dete-rioration model of reinforced concrete in saline soil environment was established based on Weibull distribution parameter estimation for competing failure analysis. The results show that:with the time increase of employing electric current, the corrosion tendency of the internal reinforcement in reinforced concrete gradually increases, and changes from the passivation state to the corrosion activation state, and gradually reaches the higher corrosion rate state. The current density for corrosion and the degree of concrete damage can be used as effective evaluation indexes for the deterioration of reinforced concrete performance, and their variation patterns over time are in accordance with the Weibull distribution function. In saline soil environment, corrosion damage to the reinforcement is the dominant factor in the pre-deterioration of reinforced concrete structures, while concrete damage is the dominant factor in the post-deterioration of reinforced concrete.

Key words： reinforced concrete saline soils corrosion-induced deterioration Weibull distribution competition failure

Published: 25 July 2023 Online: 2023-07-24

CLC number:

TU528

Fund:National Natural Science Foundation of China (52008196, U21A20150,52178216).

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	Articles by authors
	MENG Xianghui
	FENG Qiong
	ZHANG Yunsheng
	QIAO Hongxia
	XIE Xiaoyang

Cite this article:

MENG Xianghui,FENG Qiong,ZHANG Yunsheng, et al. Analysis of Corrosion-induced Deterioration Behavior and Competing Failure of Reinforced Concrete in Saline Soil Environment[J]. Materials Reports, 2023, 37(14): 22010281-10.

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http://www.mater-rep.com/EN/10.11896/cldb.22010281 OR http://www.mater-rep.com/EN/Y2023/V37/I14/22010281

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