전기화학적 기법을 통한 시멘트페이스트의 수중노출에 따른 알칼리이온 침출저감 효과: Part 2- 미세구조 분석

초록

In this study, microscopic observation was made on the surface of cement paste immersed in an aquatic environment for 100 days at electrochemical treatment to mitigate the leaching of alkali ions. To quantitatively rank the hydration products, unhydrated grains and porosity in the interfacial region, the backscattered electron(BSE) images were obtained by scanninng electron microscopy. As a result, it was found that the porosity on the surface was significantly reduced by the electrochemical treatment, while unhydrated grains were more or less increased presumably limited hydration reaction under electric charge. At electrochemical treatment, Ca2+ ions present in C-S-H gel could be precipitated with OH- t o form Ca(OH)2 then to lower C-S-H gel and simultaneously to enhance Ca(OH)2. Substantially, the risk of alkali leaching could be lowered by the limited ionized matrix under electrochemical treatment.

키워드