Initial cracking time of magnesium oxychloride cement reinforced concrete based on time-varying model of reinforcement corrosion

doi:10.3969/j.issn.1001-0505.2018.03.021

CORC > 兰州理工大学 > 兰州理工大学 > 土木工程学院

	Initial cracking time of magnesium oxychloride cement reinforced concrete based on time-varying model of reinforcement corrosion
	Gong, Wei 2; Qiao, Hongxia 1; Yu, Hongfa 2; Ma, Haiyan 2; Chen, Guangfeng 3
刊名	Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition)
	2018-05-20
卷号	48 期号:3 页码:519-527
关键词	Cements Chlorine compounds Concrete reinforcements Corrosion rate Current density Electrochemical corrosion Magnesium compounds Reinforced concrete Corrosion current densities Initial cracking time Magnesium oxychloride cement Reinforcement corrosion Time-varying models
ISSN号	10010505
DOI	10.3969/j.issn.1001-0505.2018.03.021
英文摘要	Aiming at the problem of high chloride content in magnesium oxychloride cement concrete, a time-varying model for the corrosion rate of steel in magnesium oxychloride cement concrete was studied by an electrochemical test. Combined with the corrosion current density and the theoretical model, the initial corrosion time of steel in magnesium oxychloride cement concrete and the cracking time of concrete were predicted. The results show that the corrosion rate of exposed steel (S1) is in agreement with the power function time-varying model: the corrosion rates of BNC® coated steel (S2), Zintek coated steel (S3), Dacromet coated steel (S4) and Geomet coated steel (S5) are all in line with the logarithmic time-varying model, and corrosion rate of Magni coated steel (S6)accords with exponential time-varying model. It is feasible to use the limit of the corrosion current density of steel as a standard for calculating the initial corrosion time of rebar in magnesium chloride cement concrete. S1, S2, S4 and S6 were corroded at the beginning of the test, and the initial corrosion time of S3 is 1 115 d and the initial corrosion time of S5 is 2 760 d. Compared with S1, the cracking time of S2, S3, S4, S5 and S6 is delayed by 345, 2 127, 192, 3 745 and 1 877 d, respectively. The feasibility, the long-term stability and the effectiveness of the coated steel bar in the magnesium oxychloride cement concrete are verified. © 2018, Editorial Department of Journal of Southeast University. All right reserved.
语种	英语
出版者	Southeast University
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114576]
专题	土木工程学院
作者单位	1.Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou; 730050, China; 2.Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing; 210016, China; 3.School of Earth and Space Science, Peking University, Beijing; 100871, China
推荐引用方式 GB/T 7714	Gong, Wei,Qiao, Hongxia,Yu, Hongfa,et al. Initial cracking time of magnesium oxychloride cement reinforced concrete based on time-varying model of reinforcement corrosion[J]. Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition),2018,48(3):519-527.
APA	Gong, Wei,Qiao, Hongxia,Yu, Hongfa,Ma, Haiyan,&Chen, Guangfeng.(2018).Initial cracking time of magnesium oxychloride cement reinforced concrete based on time-varying model of reinforcement corrosion.Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition),48(3),519-527.
MLA	Gong, Wei,et al."Initial cracking time of magnesium oxychloride cement reinforced concrete based on time-varying model of reinforcement corrosion".Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) 48.3(2018):519-527.