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플라이 애시와 부순모래를 사용한 고강도 콘크리트의 특성
이봉학 ( Lee Bong Hak ),김동호 ( Kim Dong Ho ),전인구 ( Jun In Ku ) 한국농공학회 2002 韓國農工學會誌 : 전원과 자원 Vol.44 No.2
The amount used of aggregates for concrete is increasing rapidly since the mid-1980s in Korea. The natural gravels from river are already displaced with crushed stone, and use of crushed sand as a substitute of natural river sands, also, is getting increased day by day. This paper is presented for analysis on mechanical properties of high strength concrete using fly ash and crushed sand. The material functions in mixing design of concretes are various water-cement ratios(w/c) such as 0.25, 0.40, 0.55 and different replacement ratio of crushed sand to natural sands such as 0%, 20%, 40%, 60%. As a results, it has been shown that compressive strengths of concretes with W/C lower than 0.40 and 0.25 are higher than 400 kgf/㎠ and 600 kgf/㎠ respectively. It is also concluded that the results of rapid chloride permeability tests of concrete are evaluated to negligible. The conclusions of this study is that it is possible to use fly ash and crushed sand for high strength concrete.