earticle

영어

Grout is used for filling joint of concrete structures, and it is required to have fluidity, required strength and shrinkage reduction performance. However, in cement-based grout, drying shrinkage is inevitable due to evaporation of surplus water during hydration reaction. Therefore, in this study, the physical properties of cement-based grout according to the replacement ratio of CSA expansion admixture were analyzed to reduce drying shrinkage. As an experimental results, fluidity increased as the replacement ratio of the expansion admixture increased, and the setting time accelerated as the replacement ratio of the expansion admixture increased. In terms of compressive strength, the initial compressive strength increased by about 7 % when the replacement ratio of the expansion admixture was 3 to 6 %, other than that, the compressive strength decreased as the replacement ratio of the expansion additve increased, so the target strength was not satisfied with the replacement ratio of the expansion admixture of 15 %. The expansion height was contracted(-) up to 6%, and the replacement ratio of 9% or more was expanded(+). The length change in drying shrinkage decreased as the replacement ratio of the expansion admixture increased, and increased as the curing temperature increased. However, compared with the replacement ratio of 0 %(Plain), the higher curing temperature, the better the compensation effect for shrinkage. As a result, it was found that the use of 9 to 12% of the expansion admixture was appropriate within the scope of this study.