Recycling of the Bottom Ash, Sourced from the Local MSW (Municipal Solid Waste) Incinerators, as a Fine Sand for Concrete

This paper described recycling of the bottom ash, sourced from the local incinerators as a fine sand for concrete. 10% bottom ash was substituted for the ordinary beach sand in the mortar(on a weigh basis), in conjunction with the pozzolznic diatomite. The specimens were tested according to KS L 5105 and analysed by TCLP(Toxic Chemical Leaching Procedure). The results showed that the hazardous heavy metals in the bottom ash are within the maximum permissible limit of TCLP. The compressive strength of the mortar with 10% bottom ash was highly improved, compared to the control mortar when the pozzolanic diatomite was used. It revealed that the hazardous heavy metals of the mortar with 10% bottom ash were leached within the maximum permissible limit of TCLP. It was concluded that the bottom ash can be reused as a fine sand for concrete when the pozzolanic diatomite was used as a stabilizer.

소각장(燒却場)에서 발생되는 바닥재의 콘크리트용 잔골재(骨材)로서의 재활용(再活用)

생활폐기물 소각장에서 발생되는 바닥재를 콘크리트 잔골재로 재활용하기 위해서, 기준모르타르에 모래 10%를 바닥재로 대체 하고 시멘트 10%를 포졸란성 규조토로 대체한 후, KS L 5105와 TCLP에 따라 시험하였다. 결과에 의하면, 바닥재의 유해중금속들은 TCLP 허용치 범위에 있었다. 포졸란성 규조토와 바닥재를 혼합한 모르타르 압축강도는 기준모르타르보다 높았으며 동시에 모든 유해중금속들은 TCLP 기준치 범위에 들어 있었다. 따라서 포졸란성 규조토를 안정재로 사용하게 되면 바닥재를 콘크리트 잔골재로 재활용할 수 있다.