Influence of chloride on corrosion behavior of reinforcement in concrete | |
| Author | Ye, Guang |
| Call Number | AIT Thesis no. ST-99-22 |
| Subject(s) | Reinforced concrete--Corrosion Reinforced concrete--Corrosion |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of master of Engineering. |
| Publisher | Asian Institute of Technology |
| Abstract | This study was conducted to investigate, through experiments, the influence of chloride-ion on corrosion behavior of reinforcement in concrete specimens subjected to simulated corrosive environment. The parameters used were the 5mm, lOmm, and 15mm thicknesses of mortar cover, 0%, 0.5% and 1.5% content of chloride in mortar, 0.5, and 0.7 water/cement ratio of mortar, and under conditions of pre-carbonated and not pre-carbonated mortar cover. The specimens were exposed in outside environment for one, two and three months. Three methods were used to observe degree of reinforcement corrosion, namely, corrosion area, weight loss and microscopic observation. The experimental results indicated that water/cement ratio of mortar significantly influenced the corrosion rate of steel and carbonation depth. Relationships were established between chloride-ion content, carbonation depth and weight loss of chloride-induced steel corrosion. Observed relationships under precarbonation and non-precarbonation were different in effects of chloride-ion on corrosion area, weight loss and morphology of corrosion. In non-precarbonation, low chloride-ion showed smaller effect on corrosion than high chloride-ion content, morphology showed a localized corrosion. But in precarbonation, low chloride-ion showed a greater influence on corrosion, morphology showed uniform corrosion and localized corrosion simultaneously. From all these results the synergetic effect of carbonation and chloride-ion on corrosion was found. The effect of chloride-ion on corrosion was different with pH. In low pH, small content of chloride-ion caused great influence on corrosion due to the destruction of passive film by carbonation. In high pH, lower content of chloride-ion showed a smaller effect on corrosion due to the stable passive film protecting from the corrosion. |
| Year | 1999 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Nii, Kazuyoshi;Nii, Kazuyoshi; |
| Examination Committee(s) | Worsak Kanok-Nukulchai;Gupta, S.P.;Pichai Nimityongskul;Kishi, Toshiharu;Wijeyewickrema, Anil C; |
| Scholarship Donor(s) | Government of China.; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1999 |