Use of Silicious Limestone By-product from Raw Meal Grinding of Cement as Coarse Aggregate for Concrete

시멘트의 원료분쇄 과정 중 부산물로 발생하는 실리카질 석회암의 콘크리트용 골재화

In this paper, the physical, chemical and mineral properties of High Silicious Limestone Gravel(HSG), which is a by-product from cement production process, was investigated experimentally to explore the possibility for the use HSG as coarse aggregate for concrete. The size of HSG was in the range of 5 mm to 20 mm. It was found that HSG had higher density and abrasion resistance than other ordinary concrete aggregates made of granite, basalt and andesite and it was proved to be stable to alkali-silica reaction. The main constituents of HSG were $SiO_2$ and CaO, and $SiO_2$ content of HSG was higher than ordinary limestone used for cement production, while it was lower than granite stone. The content of CaO of HSG was higher than that of granite stone but lower than that of lime stone. All the result of analyses and tests of HSG gave satisfactory results for using it as concrete aggregate, so it could be utilized as concrete aggregate.