Development of a non-destructive monitoring system for measuring chloride penetration depth in concrete in the marine environment | |
| Author | Antoni |
| Call Number | AIT Thesis no. ST-01-17 |
| Subject(s) | Chlorides Underwater concrete construction Concrete--Corrosion |
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Concrete structures in marine environment are subjected to chloride penetration, which significantly degrades the structural performance and their lifetime. The performances degradation of the structures is mainly controlled by corrosion of reinforcement. Therefore, system to monitor chloride penetration before the starting c01Tosion of reinforcement is indispensable. An embedded probe system to detect chloride penetration into concrete was developed in Japan. This probe consist of both the body made of Cementous material and some numbers of wires which are the sensor parts and set in the shallow ditches around the probe body. The system can detect the chloride penetration by monitoring the initiation time of wire corrosion and it has the advantages of continuous monitoring and early warning on the onset of corrosion in reinforcement. However, the probe had not yet had high sensitivity for detecting c1itical chloride content in concrete. Therefore, to increase its sensitivity, four types of improvement conditions, namely partial coating on wire, waterproofing on the probe body, filling the ditches with porous material and supplying small current on the wire were evaluated in this study. From the experimental result, it was observed that current supply and partial coating on the wire smface can improve the sensitivity of the probe significantly while waterproofing treatment on the probe body and filling the ditches can not have significant contribution. Furthermore, estimation system to predict the lifetime of structure based on the probe measurement was developed and proposed here. The system can predict corrosion initiation time of reinforcement as well as chloride diffusion coefficient of concrete. |
| Year | 2001 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Takewaka, Koji; |
| Examination Committee(s) | Nii, Kazuyoshi ;Zhu, Hongping; |
| Scholarship Donor(s) | Government of Austria ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2001 |