시멘트 모르터에 레미콘 슬러지를 재활용하는데 있어서 포졸란 혼합재의 효과

Abstract

Effect of the pozzolans on the physical properties of the OPC(Ordinary Portland Cement) mortar with use of the remicon sludge waste(RSW) was studied. RSW was replaced with cement in the OPC mortar from 5%, 10% and 20%. The pozzolans were also substituted for RSW from 5%, 10% and 20% on a weight base. The cube specimens were cast in accordance with KS L 5109 and tested for compressive strength(CS), durability, pore size distribution (PSD), scanning electrum microscope(SEM) and X-ray diffraction(XRD). The results showed that the optimum amount of RSW to replace with cement in the OPC mortar was 10% and pozzolan to substitute for RSW was 20%, respectively. The physical properties(e.g., CS and durability) of the cement mortar with the use of the RSW and pozzolan(as above) at 7, 28 and 56 days were higher than that of the OPC mortar. XRD revealed that calcium silicate hydrates(Ca2SiO4 and Ca3SiO5) crystalline products were identically appeared in both OPC and RSW cement mortar, but less amount of CaO was exhibited in the RSW cement mortar compared to the OPC mortar. It was concluded that the pozzolans had an effect on improvement of the physical properties of the OPC mortar when 10% of the RSW was replaced for cement and 20% pozzolans were substituted for RSW.