Influence of Replacement Ratio of Wasted Refractory Aggregate on the Properties of Mortar using Blast Furnace Slag and Recycled Aggregate

폐내화물 골재 치환율이 고로슬래그 미분말과 순환골재 사용 모르타르의 품질에 미치는 영향

In this research, the possibility of wasted refractory aggregate pulverized from refractory block as an expansive admixture and additional alkaline stimulant for class two and three blast furnace slag cements (BSC) was assessed with its high content of free CaO or free MgO. As the replacement ratios of wasted refractory powder and blast furnace slag were increased, flow and air content were decreased, while unit volume weight was increased under same conditions. Compressive strength of mortar was increased with increased replacement ratio of wasted refractory powder, especially, in the case of class three BSC, the highest compressive strength was obtained when wasted refractory aggregate was replaced 2%.