Reliability Analysis of Reinforcement Based on GM(1,1)-Markov Semi-immersion Test  

作　　者：FU Yong QIAO Hongxia HAKUZWEYEZU Theogene 付勇;乔宏霞

机构地区：[1]School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China [2]Gansu Advanced Civil Engineering Materials Engineering Research Center,Lanzhou 730050,China [3]State Key Laboratory of Geomechanics and Geotechnical Enginering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China [4]Civil Engineering Department,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2024年第5期1177-1187,共11页武汉理工大学学报（材料科学英文版）

基　　金：Funded by National Natural Science Foundation of China(No.52178216);Gansu Provincial Science and Technology Programme(No.23JRRA813)。

摘　　要：To investigate the corrosion degradation law and service life of reinforced concrete in various salt solution environments,reinforced concrete specimens were semi-immersed in 3%Na_(2)CO_(3)(N3-0-0),3%Na_(2)CO_(3)+3%NaCl(N3-Cl3-0)and 3%Na_(2)CO_(3)+3%NaCl+3%Na_(2)SO_(4)(N3-Cl3-S3)salt solutions.The electrochemical workstation was used for regular non-destructive testing,and the polarization curve and related electrochemical parameters were used as the macroscopic durability evaluation indicators,while microscopic analysis of steel bar corrosion products was performed in combination with SEM and EDS.In addition,the corrosion current density degradation model of GM(1,1)was established and compared with the modified GM(1,1)-Markov degradation model.The results showed that the prediction error of the GM(1,1)-Markov model was smaller and more accurate than that of GM(1,1).The reinforced concrete specimens in the N3-0-0,N3-Cl3-0 and N3-Cl3-S3 solutions reached the failure state in 3.08,1.67,and 2.30 years,respectively,as predicted by the GM(1,1)-Markov model.According to ESM and EDS microscopic analysis of reinforcement,carbonate had no significant effect on reinforcement corrosion,chloride ions played a dominant role in reinforcement corrosion,and sulfate ion improved concrete's resistance to chloride ion corrosion.Based on GM(1,1)-Markov model,the failure and damage of reinforced concrete in saline soil areas can be quantitatively evaluated in the whole life cycle,which provides a theoretical basis for the early maintenance or reinforcing of reinforced concrete.

关 键 词：salt solution semi-immersion corrosion current density GM(1 1)-Markov 

分 类 号：TU375[建筑科学—结构工程]