Abstract
The purpose of this study is to evaluate the performance of polymer cement slurry-coated steels such as reinforcing bar and steel plate. Polymer cement slurry-coated steels, which is made from two types of polymer dispersions such as St/BA and EVA are prepared, and tested for viscosity, flow, tensile strength, corrosive resistance, bendability, adhesion, bond strength to cement concrete. From the test results, the workability of polymer cement slurry in the coating process at surface of reinforcing bar or steel plate is slightly improved according to containing of fly ash. The polymer cement slurry-coated steels have good adhesion, corrosive resistance, fairly good bendability and high bond strength. The corrosion resistance of polymer cement slurry-coated steels is improved to a great extent compared to that of plain steel. The thicker the coating, the weaker the bond strength to cement concrete. The bond strength of polymer cement slurry-coated reinforcing bars with coating thickness of 200±50 mm to cement concrete is not less than that of epoxy-coated bar. The coating thickness is very important factor to maintain the acceptable bond mechanism and goes well with the ASTM and those of Korean Concrete Institute. However, it needs a little thick coating thickness for other performances such as corrosion resistance, bendability. Therefore, it is impotance to have optimum mix proportions that get the balance between thickness and performance. The polymer films formed in polymer cement slurry play a great important role in improvement of performance of polymer cement slurry-coated reinforcing bar. In this study, it is apparent that the choice of polymer type, thickness, admixture and curing condition is important to improve the adhesion between polymer cement slurry and reinforcing bar, coated reinforcing bar and cement concrete.