| 요약2 |
The purpose of this study was to remove the excessive air foaming which was produced in mixing the RSLMC(latex-modified concrete with rapid- setting cement) by choosing the best antifoam agent type and the optimized quantity for performance improved RSLMC. A series of RSLMM(latex-modified mortar with rapid-setting cement) experiments were carried out as the basic for RSLMC with the main experimental variables such as antifame types(A, E, C, D), antifoam contents(O, 1. 2, 3%), Air content test and compressive, flexural tests were carried out to measure the improved properties of RSLMM and RSLMC, Chloride ion permeability test was carried out to estimate water permeability resistance.The results of RSLMM showed that the decrease of 50% air content was obtained by adventuring a antifoam agent by 1%. The compressive strength and flexural strength at 3 hours after RSLMC placement were 235kgf/cm2 and 49kgf/cm, respectively, which exceeded the flexural strength criterion of 45kgf/cm in order to open the RSLMC placed to traffic. The chloride permeability using A and C antifoamer at 28 days were below 100 coulombs, which was the permeability rating of negligible according to ASTM |