| Title |
Adhesion in Tension of Cement Mortar to Cement Concrete Substrates Coated with Polymer Cement Slurry |
| Keywords |
Polymer Cement Slurry ; Polymer Dispersion ; Polymer-cement Ratio ; Adhesion in Tension |
| Abstract |
In general, polymer cement slurry that is made from organic polymer dispersion and cement has good adhesion to cement concrete and steel, waterproofness and acid resistance due to being of polymer films formed in cement slurry. The purpose of this study is to evaluate the adhesion of cement mortar to polymer cement slurry(PCS)-coated base concrete substrate. The test specimens are prepared with two types of bond cement mortars that are made from ordinary cement and St/BA emulsion, two types of PCSs with ordinary and ultra rapid hardening cements, four types of base polymer cement concretes with St/BA, EVA and SBR emulsions, and tested for the adhesion in tension of the specimens subjected to dry curing condition for 28 days at 20℃, 50% R.H. From the test results, the adhesion in tension of cement mortars to St/BA-modified concrete substrate is higher in the specimens. When St/BA-modified mortar is used as a bond mortar, the adhesion in tension is improved about 1.24 times compared with that of ordinary cement mortar. The maximum adhesion in tension according to polymer type of base concrete gets in St/BA-modified concrete with polymer-cement ratio of 10%. It is apparent that the choice of polymer type, polymer-cement ratio, and PCS type is important to improve the adhesion in tension between the bond mortar and base concrete. |