수축저감제를 사용한 콘크리트의 물성변화 및 건조수축 저감 특성

Abstract

This paper reports the contribution of Shrinkage reducing admixture(SRA) to the physical properties and drying shrinkage of concrete. Dosage of SRA is varied with. For the properties of fresh concrete, an increase in SRA dosage results in a decrease in fluidity and air content, while setting time is accelerated. For the properties of hardened concrete, the incorporation of mineral admixture leads to a decrease in compressive strength at early age, whereas after 28 days, the incorporation of fly ash(FA) and blast furnace slag(BS) has greater compressive strength than conventional concrete without admixture. The use of SRA results in a decrease in compressive strength. The incorporation of SRA with every <TEX>$1\%$</TEX> increase causes the decrease of compressive strength by as much as <TEX>$3\~6\%$</TEX>. For drying shrinkage properties, the incorporation of FA and BS reduces drying shrinkage slightly. The use of SRA also decreases drying shrinkage. Every <TEX>$1\%$</TEX> of increase in SRA dosage can reduce drying shrinkage by as much as <TEX>$10\~15\%$</TEX>