To test the compressive strength of the cement mortar,the X-ray diffractometer and the scanning electron microscopy were used to observe the microstructure of the test block by testing the steel slag micropowder and silica fume to replace some cement.The strength of the mortar and the effect of gelation.The test results show that the growth rate of compressive strength of cement mortar increases with the increase of age when steel slag micropowder replaces part of cement.When binary compounding,the growth rate of strength is much larger than that of blank group.20%works best.Adding steel slag ...