Fly ash is a by-product of coal fired electrical power plants and used as a material for cement and concrete; particularly, imported fly ash is mainly applied for cement production. Main objectives of this article are to replace domestic fly ash with an imported source. To verify the possibility of domestic fly ash as a material for cement from the aspect of chemical composition and physical properties, we manufactured various kinds of cement, such as using only natural raw material, shale, and partial replacement with domestic and imported fly ash. When we used the domestic and imported fly ash, there were no specific problems in terms of clinker synthesis or cement manufacturing in relation to the natural material, shale. In conclusion, domestic fly ash has been confirmed as an alternative raw material for cement because 7 days and 28 days compressive strength values were better than those of reference cement using natural raw material, on top of the process issue.

두부는 전통 콩 가공식품중의 하나로 콩을 불리고, 삶고, 갈은 후, 기존 두부응고제로바닷물에서 추출한 간수를 사 용하였지만, 비소(AS)의 다량 검출로 인해 응고제의 사용이 금지됨에 따라, 현재 값비싼 수입 화학응고제(염화마그네 슘, 황산칼슘, 밀키마그네슘 등)를 간수 대신에 사용되고 있지만, 우리는 화학응고제에 의존하지 않고, 미네랄이 풍부 한 간수에서 비소만을 제거한 응고제를 사용하고자 본 연구에서는 응집→침전→여과 시스템을 연구하여,100% 비소 (AS)를 제거한 응고제를 개발하고자 한다.