A Study on the Characteristic of Lightweight Aggregate Concrete in Before and After Pressurization by the Amount of Contained Water in Lightweight Aggregate

경량골재의 함수상태에 따른 가압 전.후 경량골재 콘크리트의 특성에 관한 연구

The application of lightweight aggregate can be a solution for improving concrete performance. Its adoption will derive improved functions such as decrease of dead load and the improvement of insulation and sound absorption. But, according to previous studies of lightweight aggregate concrete, the structure of lightweight aggregate is a porous body so that it shows a faster and higher absorption performance than normal aggregate, and thereby it causes hardship for workability, durability, quality control and pumpability. As this study is a fundamental study for activation of lightweight aggregate concrete, the concrete has been manufactured by varying the amount of contained water in lightweight aggregate. Moreover, through concrete pressurization tests, quality of concrete are measured before and after pressurization. And consequently the following conclusions are obtained. As increasing the amount of contained water in lightweight aggregate, values of slump flow and unit weight are increased, values of air content, strength and frost resistance are decreased. As pressurization on lightweight aggregate concrete, values of slump flow and air content are decreased, values of unit weight, strength and frost resistance are increased.