Reliability analysis of reinforced concrete based on Wiener stochastic process in heavy salt soil electrified environment

doi:10.11817/j.issn.1672-7207.2020.08.021

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	Reliability analysis of reinforced concrete based on Wiener stochastic process in heavy salt soil electrified environment
	Lu, Chenggong 2; Wei, Zhiqiang 1; Qiao, Hongxia 2,3; Li, Kan 2; Qiao, Guobin 2; Yang, Bo 2
刊名	Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)
	2020-08-26
卷号	51 期号:8 页码:2266-2276
关键词	Concrete construction Corrosion rate Durability Electric fields Electric impedance measurement Failure (mechanical) Ions Maximum likelihood estimation Nondestructive examination Outages Polarization Random processes Reliability analysis Soils Stochastic systems Underground corrosion Alternating current impedance Anti-erosion ability Capacitive reactance Corrosion current densities Degree of reliability Maximum likelihood methods Polarization curves Stochastic degradation
ISSN号	16727207
DOI	10.11817/j.issn.1672-7207.2020.08.021
英文摘要	In order to explore the influence of corrosion ion and current on the durability of reinforced concrete in the service environment, reinforced concrete prismatic specimens of three strength grades were placed in the heavy saline soil for constant current acceleration test. The electrochemical workstation and crack detector were used for nondestructive testing regularly. The degradation process of reinforced concrete durability was analyzed by polarization curve and alternating current impedance graph. Non-monotone Wiener stochastic degradation process was selected for modeling and maximum likelihood method was used for parameter estimation. According to the crack width of concrete and crack failure criterion, the failure threshold of corrosion current density in the electrified accelerated environment of saline soil was obtained, and the relationship curve between electrified time and reliability was established. The results show that in the electrified environment of saline soil, corrosive ions enter into the concrete through diffusion, infiltration and electric field adsorption, and then migrate to the surface of reinforcement. pH value of the concrete decreases and the conductivity increases. The polarization curve moves toward the negative potential. The probability and rate of corrosion increase, and the alternating current impedance spectrum shows double capacitive reactance arc. At the beginning of power on, the arc radius of low frequency capacitive reactance decreases sharply and shrinks to the real part of impedance. When the crack width is 0.2 mm, the failure thresholds of corrosion current density of reinforced concrete for C35, C40 and C45 are 2.353, 1.817 and 1.187 μA/cm2, respectively. The higher the strength grade of concrete is, the longer the reliability is maintained at 1.0, and the stronger the anti erosion ability is. Under the coupling action of corrosive ions and current, the degree of reliability for C35, C40 and C45 specimens decrease to below 1.0 at 160, 240 and 430 h, respectively. The longer the time of power on is, the lower the reliability of reinforced concrete is. © 2020, Central South University Press. All right reserved.
语种	中文
出版者	Central South University of Technology
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/115176]
专题	理学院土木工程学院
作者单位	1.State Key Laboratory of Advanced Processing and Recycling Built by Province and Ministry of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China; 2.School of Civil Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 3.Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Lu, Chenggong,Wei, Zhiqiang,Qiao, Hongxia,et al. Reliability analysis of reinforced concrete based on Wiener stochastic process in heavy salt soil electrified environment[J]. Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology),2020,51(8):2266-2276.
APA	Lu, Chenggong,Wei, Zhiqiang,Qiao, Hongxia,Li, Kan,Qiao, Guobin,&Yang, Bo.(2020).Reliability analysis of reinforced concrete based on Wiener stochastic process in heavy salt soil electrified environment.Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology),51(8),2266-2276.
MLA	Lu, Chenggong,et al."Reliability analysis of reinforced concrete based on Wiener stochastic process in heavy salt soil electrified environment".Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) 51.8(2020):2266-2276.