基于双应力的钢筋混凝土恒加试验腐蚀劣化规律研究

doi:10.11896/cldb.21030289

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Abstract In view of the characteristics of long durability test period and large data dispersion of reinforced concrete, high corrosive saline soil was selec-ted as conductive medium to design constant accelerated corrosion test. In this work, the deterioration process of the one-dimensional and the three-dimensional reinforced concrete specimens under double stress of constant current and corrosive ions was simulated. Electrochemical impedance spectroscopy (AC impedance) data, chloride ion content data, and microscopic and macroscopic morphology data were collected during the accelerated test. Meanwhile, a statistical model of corrosion degradation in constant acceleration test based on lognormal distribution was established. The results have shown that the paraffin protective layer can increase the average life of reinforced concrete under chloride stress, constant current stress, and double stress by 249 h, 268 h and 115 h, respectively.The constant current stress firstly acts on the reinforced concrete, and the appearance of penetrating crack accelerates the corrosion effect of chloride ion stress. Finally, the double stress superposition increases the corrosion deterioration rate of reinforced concrete. The deterioration model of constant addition test based on lognormal distribution can realize the quantitative analysis of the protective effect of paraffin, and the influence factors of paraffin under chloride ion, constant current and double stress are 0.41, 0.35 and 0.19, respectively.

Key words： paraffin isolation layer constant current acceleration maximum likelihood estimation corrosion influence factor

Published: Online: 2022-06-09

CLC number:

TU528

Fund:National Natural Science Foundation of China (U21A20150, 51878153, 52178216, 52008196), the Youth Science and Technology Foundation of Gansu Province (20JR5RA440), ‘Innovation Star' Project for Excellent Postgraduates in Gansu Province (2021CXZX-485), Research and Demonstration of Key Technologies of Green and Smart Highways in Gansu Province (21ZD3GA002), the Hongliu First-class Discipline Construction Program of Lanzhou, Research on Key Technologies of Durability Repair of Highway Concrete Bridges, and Key Projects of Chongqing Science and Technology Bureau (cstc2021jscx-jbgs0029).

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	SHANG Minggang
	ZHANG Yunsheng
	HE Zhongmao
	QIAO Hongxia
	FENG Qiong
	XUE Cuizhen
	HAN Zhao

Cite this article:

SHANG Minggang,ZHANG Yunsheng,HE Zhongmao, et al. Study on Corrosion Deterioration of Reinforced Concrete Under Constant Acceleration Test Based on Double Stress[J]. Materials Reports, 2022, 36(11): 21030289-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21030289 OR http://www.mater-rep.com/EN/Y2022/V36/I11/21030289

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