Performance evaluation of corrosion protection coatings in reinforced concrete exposed to chloride | |
| Author | Rattakit Kittimunkong |
| Call Number | AIT Thesis no.ST-16-12 |
| Subject(s) | Reinforced--Concrete Concrete--Chemistry Concrete--Corrosion Chlorides |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-16-12 |
| Abstract | One of the major causes of the failure of a reinforced concrete structure is inarguably the corrosion of the reinforcing steels. Corrosion is a destructive reaction that is very harmful to any metal. To protect the reinforcement from such threat, many useful methods have been adopted. One of the very common and widely-used methods is to apply a corrosion protection coating on the surface of the steel. In the current market, there are various types of corrosion protection coatings available to select. This study presents the experiments to evaluate the performance of four selected types of commercial coatings namely, epoxy-cement based coating, cementitious based primer, epoxy zinc primer, and epoxy coating for protection of reinforcing steels in concrete exposed to chloride. Three experiments were planned for this evaluation: ASTM C876 (Half-Cell Potentials Method), ASTM G109 (Standard Test Method for Determining the Effects of Chemical Admixtures on the Corrosion of Embedded Steel Reinforcement in Concrete Exposed to Chloride Environments) and Bonding Strength Test. For specimens used for ASTM G109 and ASTM C876 tests, they were admixed with 0%, 5%, and 10% NaCl solution to simulate different levels of corrosive environments. All of the specimens were put in a repeated cycle of 2-week wet (ponded with 10% NaCl solution) and 2-week dry throughout the experiment. For the bonding strength test, the bonding stress between each coating and the concrete was measured. In addition, the corrosion performance of the treated previously-corroded steel was tested against that of the new steels as well by conducting the same experiment. The results of all three tests convincingly showed that epoxy zinc primer performed best among four types of the coatings tested. |
| Year | 2016 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-16-12 |
| 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) | Punchet Thammarak; |
| Examination Committee(s) | Thanakorn PheeraphanRaktipong Sahamitmongkol; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2016 |