Fundamental Study on the Utilization of Demolished Concrete for Water Purification Material

Abstract

Up to now, the reuse of demolished concrete is limited into the use for the foundation of structure or sub-base coarse of pavement. From the point of essential effective use of resources, however, it is necessary to compose the cascade process of utilization system for the purpose of applying the characteristics of material itself Inthis research, the new utilization of demolished concrete as the water purification material is investigated experimentally. Focused pollutant is phosphate ion in environmental water. Demolished concrete was crashed and divided into coarse particles and fine particles, and phosphate removal ability of these particles was examined with column method passing through an aqueous phosphate solution. As a result, it was confirmed that concrete particleshad the phosphate removal ability, and its mechanism of removal was assured to be the crystallization due to the calcium ion dissolved from concrete. Furthermore, removal ability of fine particles was about 8 times higher than that of coarse particles. Therefore, it was confirmed that demolished concrete is able to use for water purification material.