title: A Monitoring Method Based on FBG for Concrete Corrosion Cracking.
abstract: Corrosion cracking of reinforced concrete caused by chloride salt is one of the main determinants of structure durability. Monitoring the entire process of concrete corrosion cracking is critical for assessing the remaining life of the structure and determining if maintenance is needed. Fiber Bragg Grating (FBG) sensing technology is extensively developed in photoelectric monitoring technology and has been used on many projects. FBG can detect the quasi-distribution of strain and temperature under corrosive environments, and thus it is suitable for monitoring reinforced concrete cracking. According to the mechanical principle that corrosion expansion is responsible for the reinforced concrete cracking, a package design of reinforced concrete cracking sensors based on FBG was proposed and investigated in this study. The corresponding relationship between the grating wavelength and strain was calibrated by an equal strength beam test. The effectiveness of the proposed method was verified by an electrically accelerated corrosion experiment. The fiber grating sensing technology was able to track the corrosion expansion and corrosion cracking in real time and provided data to inform decision-making for the maintenance and management of the engineering structure.
authors.affiliation: Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China. jhmao@nit.zju.edu.cn.
authors.forename: Jianghong
authors.initials: J
authors.lastname: Mao
authors.affiliation: Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China. xfyalla@163.com.
authors.forename: Fangyuan
authors.initials: F
authors.lastname: Xu
authors.affiliation: Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China. sillyliar@sina.com.|College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China. sillyliar@sina.com.
authors.forename: Qian
authors.initials: Q
authors.lastname: Gao
authors.affiliation: Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China. rui565282919@163.com.|College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China. rui565282919@163.com.
authors.forename: Shenglin
authors.initials: S
authors.lastname: Liu
authors.affiliation: Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China. jinwl@zju.edu.cn.
authors.forename: Weiliang
authors.initials: W
authors.lastname: Jin
authors.affiliation: Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China. xyd@nit.zju.edu.cn.
authors.forename: Yidong
authors.initials: Y
authors.lastname: Xu
keywords: Fiber Bragg Grating; corrosion cracking; reinforced concrete; reinforcement corrosion; structural health monitoring