재생골재 콘크리트의 강도향상을 위한 혼화재료의 활용

Abstract

To promote recycling of waste concrete as concrete aggregate, strength inprovement of recycled aggregate concrete was investigated using mineral admixtures such as fly ash, ground granulated blast furnace slag(GGBF), fly ash, and diatom. When high early hardening portland cement was properly used '0.725% of the total weight of mortar', the strength of mortar mixed with GGBF or diatom was better developed in comparison with that of mortar mixed with silica fume. The compressive strength of recycled aggregate concrete without mineral admixtures was 10% lower than that of natural aggregate concrete. However, compressive and tensile strength of recycled aggregate concrete was highly improved by mixing of fly ash and GGBF or diatom and highly increased at the age of 28days for mixing fly ash as the second step. The ratio of compressive development of recycled aggregate concrete was similar to depending on the mixing ratio of fly ash and GGBF or diatom.