| 논문명 |
인공경량골재의 흡수성과 프리웨팅 처리에 대한 고찰 / Study of the Water Absorption and Pre-wetting of Artificial Lightweight Aggregates / session 10 : 특별세션 1 (석탄회로 제조하는 기능성 건축재료) |
| 저자명 |
김재홍(Kim, Jae Hong) ; 윤진영(Yoon, Jin Young) |
| 수록사항 |
한국건설순환자원학회 학술발표 논문집, Vol.16 n.2 (2016-11) |
| 요약2 |
Artificial lightweight aggregates are produced by sintering raw materials such as bottom ash and clays. They inherently include large amount of pores inside, which results in low density, low strength, and high water absorption. Therefore, a Korean specification for construction of concrete structures recommends to apply pre-wetting for lightweight aggregates. Submerging lightweight aggregates in water more than 24 hours is a general way to have the pre-wetting. Spraying water into the lightweight aggregates covered from water evaporation is also necessary in the middle of producing concrete. However, concrete producers are reluctant to take the pre-wetting process due to its labor-intensiveness. Difficulty in quality control of lightweight aggregates, in spite of the pre-wetting process, is another reason that they are hardly adopted by ready-mixed concrete producers. In order to understand the water-absorbing state of lightweight aggregates, their water absorptions were evaluated using water-submerging and centrifuge methods. The test results indicate that the pre-wetting effect depends on the type of lightweight aggregates and their time of water-submerge. Therefore, detailed control for water absorption is required according to the type of lightweight aggregates in hand. |
