An Experimental Study on the Water Tightness of Fly Ash Antiwashout Underwater Concrete

J. Ocean Eng. Technol. 2008;22(4):40-45.

Kwon Jung-Hyun,Kim Bong-Ik

Institute of Marine Industry Division of Civil and Environmental Engineering Gyeongsang National University,Institute of Marine Industry Division of Civil and Environmental Engineering Gyeongsang National University

플라이애시 수중불분리성 콘크리트의 수밀성에 관한 실험적 연구

권중현,김봉익

경상대학교 토목환경공학부 해양산업연구소,경상대학교 토목환경공학부 해양산업연구소

Keywords: Antiwashout underwater concrete, Fly ash, Water tightness, Permeability test, Depth of permeation

핵심용어: 수중불분리성 콘크리트, 플라이애시, 수밀성, 투수성시험, 투수깊이

Abstract

This paper describes the effects of fly ash replacement on the water tightness of antiwashout underwater concrete, which replaced the cement with fly ash from 0% to 30%. The experimental work was performed to find out the depth of permeation of concrete specimens cast in air and cured in 23 $^{circ}C$ tap water using an open center pressure type of water permeation tester. The results showed that the permeation depth values of antiwashout underwater concrete were deeper than normal concrete, but that an admixture using fly ash during antiwashout underwater concrete casting in air made it more watertight than normal concrete according to the water permeation testing. SEM observations of the specimens of fly ash antiwashout underwater concrete showed that it wasmore packed with structures because of the pozzolan reaction of the fly ash and cement.