압축강도 300MPa이상의 초고강도 분체콘크리트 개발을 위한 실험적 연구

초록

In this study, ordinary portland cement was used and the air gap was minimized by using minute quartz as a filling. Additionally, the steel fiber was used to solve the brittle failure problem occurred by high intensity. This study is in progress to make an Ultra-high strength powdered concrete which has compressive strength over 300MPa. To increase the strength of concrete, we have compared and analyzed the compressive strengths of each mixture proportion with different material ratios and curing conditions by selecting quartz sand, dolomite, bauxite, ferro silicon which have diameters less than 0.6mm and can increase the bond strength of the transition zone. Ultra-High strength powdered concrete, which is different from original concrete, is highly influenced by the used materials. In the study, the compressive strength of the powdered concrete was the greatest when it is mixed with ferro silicon, then showed strengths followed by Bauxite, Dolomite, and Quartz sand. Moreover, the greatest value of strength was shown when the proportion of ferro silicon was 110%, of the weight of the cement. According to the SEM result, C-S-H hydrate was made the most, and Tobermorite was made by high temperature and pressure cure. Additionally, Ultra-high strength powdered concrete which has 341Mpa of 28th day compressive strength has been successfully achieved by two factors; reinforcing tensile strength with the steel fiber, and strengthening the paste with the smaller particled aggregates, the filling powder minimizing the air gap, and the reactive materials.

키워드