Abstract: Portland cement-copper slag compound cementitious material was prepared by replacing Portland cement (PC) by copper slag at the levels of 5%, 10% and 15%.Water required for normal consistency, setting time, compressive strength of paste specimens, flexural and compressive strengths of mortar specimens of the PC-copper slag compound system were studied.XRD,TG/DSC and SEM-EDS were also used to analyze the hydration products and microstructure of the PC-copper slag system.The results show that the use of copper slag increase the water required for normal consistency and setting time of PC.The flexural and compressive strength of the material are also generally increased after adding copper slag.In addition to the generation of Fe(OH)3/Fe(OH)2 gel, the main hydration product of Portland cement-copper slag compound cementitious material is similar to that of PC.Compared to PC, Portland cement-copper slag compound cementitious material the microstructure of the latter became denser.

Key words: copper slag;setting time;compressive strength;hydration product