Theoretical approach to a corrosion mechanism for reinforcing steel in concrete | |
| Author | Veerachai Leelalerkiet |
| Call Number | AIT Thesis no.ST-00-19 |
| Subject(s) | Reinforced concrete--Corrosion Steel--Corrosion |
| Note | A thesis submitted in partial fulfillment of requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Reinforced concrete structure in marine environment has the deterioration problem caused by corrosion of reinforcement. For examining this deterioration process quantitatively, some numerical simulation model for deterioration of concrete structure due to chloride attack may be very useful. Therefore, in Kagoshima University, a simulation model was developed on the basis of both the penetration models of chloride and oxygen and the corrosion model of reinforcement, considering the scatter of concrete quality and existence of initial crack. However, the model needs some improvement to obtain more effective results reflecting the actual deterioration condition. In this study, some additional models, such as a coarse aggregate setting model and an actual chloride diffusion model, were incorporated into the above simulation model. For setting of coarse aggregate, the interface transition zone (ITZ) between surface of coarse aggregates and cement matrix was introduced in the concrete environment model. This zone is very porous in which the deterioration substances, such as oxygen and chloride can easily diffuse. For the consideration of chloride diffusion process, chloride combined process into hydration product was introduced in the diffusion equation. Because actually in concrete, free chlorides only should contribute in the initiation process of corrosion. By using the newly improved simulated model, it was examined to estimate both the period of corrosion initiation on reinforcement and the period of corrosion crack generating on concrete. Consequently, the additions of ITZ and free chloride distribution process into the model can encourage the reliable results in the corrosion initiation time. However, for evaluating the corrosion crack generation time, the more improvement is still required to introduce the consideration of resistivity of concrete into the corrosion process model for the reinforcement. |
| Year | 2000 |
| 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 ;Pennung Warnitchai; |
| Scholarship Donor(s) | Asian Institute of Technology (Partial Scholarship) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2000 |