An Experimental Study on the Setting of Antiwashout Underwater concrete Using Fly Ash

J. Ocean Eng. Technol. 2001;15(4):120-125.

플라이애쉬를 사용한 수중불분리성 콘크리트의 응결에 관한 실험적 연구

권중현,김봉익

경상대학교 해양토목공학과 해양산업연구소,경상대학교 해양토목공학과 해양산업연구소

Keywords: Antiwashout underwater concrete, Fly ash, Setting, Sea water

핵심용어: 수중불분리성 콘크리트, 플라이애쉬, 응결, 해수

Abstract

This paper describes the effect of fly ash replacement on the setting time of antiwashout underwater concrete, where cement was replaced by 0% to 50%. Experimental work was performed on the condition of sea water and in air to find out the characteristics of setting time between the concretes that were cast in air and cast in 15$^{circ}C$ of sea water. The experimental results show that the setting time of underwater concrete with 50% replacement was delayed about 10 hours than normal concrete. And it can be concluded that, at the case of underseawater concrete addicted with fly ash, the delayed final setting times are shown as the function Tf=0.069F+7.69, where Tf is the delayed final setting time and F is quantity of fly ash, respectively. These results confirm that the setting time underseawater concrete could be prolonged.