도시 생활폐기물 소각 바닥재를 혼합한 시멘트 고화체의 강도 특성

Abstract

In order to recycle the incineration bottom ash generated from municipal solid waste as a construction material, a series of uniaxial compression tests were carried out according to the mixing ratio of bottom ash, the curing temperature, the water-cement ratio, the mixing ratio of EPS and the curing time. As the results of tests, the water content of the hardened cement mortar keeps constant independent of curing time. Also, the water content is increased with increasing the mixing ratio of bottom ash, the water-cement ratio, and the mixing ratio of EPS. The unit weight of the hardened cement mortar is decreased with increasing the mixing ratio of bottom ash and the mixing ratio of EPS. The compression strength of the hardened cement mortar is decreased with increasing the mixing ratio of bottom ash. The compression strength of the hardened cement mortar cured at 30±2℃ and 40±2℃ is bigger than that of the cement mortar cured at normal temperature (20±2℃). However, the compression strength of the hardened cement mortar cured at 30±2℃ is bigger than that of the cement mortar cured at 40±2℃. The compression strength is increased at the range from 0.55 to 0.6 of water-cement ratio, and then the compression strength is decreased over 0.65 of water-cement ratio. Meanwhile, the compression strength of the hardened cement mortar is decreased with increasing the mixing ratio of EPS. The compression strength cured 28 days in each mixing ratio is ranged from 87 kg/cm2 to 220 kg/cm2. These strengths are satisfied with the standard value of compression strength (80kg/cm2) of sidewalk blocks.