Effect of Steel Slag Powder and Ceramic Polishing Powder on Cement Hydration at Different Water Binder Ratio

Composite cementitious materials were prepared by Portland cement and supplementary cementitious materialssteel slag powder (SS) and ceramic polishing powder (PP).The effects of waterbinder ratio and content of SS and PP on the compressive strength, chemical combined water content, pore solution pH value and microstructure were investigated.The results show that the most significant effect of waterbinder ratio on compressive strength is SScement, secondly it is PPcement and the last is Portland cement at the same hydration age.Chemical combined water content of SScement and PPcement decreases with decreasing the waterbinder ratio.at the same content of SS and PP and the same hydration age.Also, the pore solution pH value and the compressive strength increase with decreasing the waterbinder ratio.Microstructure of various cement hydration systems become more dense with decreasing the waterbinder ratio.The pore solution pH value and chemical combined water content of SScement are higher than those of PPcement, but the compressive strength is lower than that of PPcement.The pozzolanicactivity and the filling efficient of microaggregate of PP is higher than those of SS.