| Title |
Effects of Mix Proportions and Coating Thickness on the Bond Strength of Coated Rebar by Polymer Cement Slurry |
| Authors |
Jo Young-Kug ; Park Dong-Yeol ; Jang Gil-Su |
| Keywords |
Polymer Cement Slurry ; Polymer Dispersion ; Bond Strength ; Coated Rebar |
| Abstract |
In general, polymer cement slurry(PCS) that is made from organic polymer dispersion and cement has good adhesion to steel and cement concrete, waterproofness and acid resistance due to being of polymer films formed in cement slurry. The purpose of this study is to evaluate the effects of the mix proportions and coating thickness on the bond strength of coated rebar by PCS. The test pieces are prepared with two types of polymer dispersions such as St/BA and EVA, four polymer-cement ratios, two types of cement and four types of coating thickness, and tested for the bond strength test. From the test results, bond strength of PCS-coated rebar with St/BA and EVA is better than that of plain rebar and epoxy-coated rebar. In general, it is also high bond strength at polymer-cement ratios of 80% or more, and coating thickness of 100㎛. The maximum bond strength of PCS-coated rebar with ultra high-early strength cement and St/BA at polymer-cement ratio of 80%, and coating thickness of 100㎛ is about 1.5 and 1.6 times respectively, the strength of plain rebar and epoxy-coated rebar. It is apparent that the choice of polymer type, cement type, polymer-cement ratio and coating thickness is important to improve the bond strength of PCS-coated rebar to cement concrete. |