Cementitious Property of Steel Slag Powder and Impact on Mechanical Property of Cement

It has great potential that steel slag powder as the supplementary cementitious materials used in cement and concrete field. Cementitious property of steel slag powder and effect of its fineness and incorporation amount on the mechanical property of blended cement were studied. The results show that the strength and hydration degree of steel slag powder paste are significantly increased with reducing of particle size( 28 d compressive strength is increased from 4. 0 MPa to 21. 5 MPa,the Ca( OH)2content from 3. 49% to 5. 48%,and the nonevaporable water content from 3. 79% to 8. 62%). The 3 d paste and mortar strength of blended cement containing30wt% steel slag firstly increases,then decreases with reducing of particle size( SC-50 is the turning point); and7 d,28 d strength gradually increases with reducing of particle size. The effect of incorporation amount of steel slag powder in blended cement on the strength of blended cement is significant. All periods' strength and 28 d hydration degree of blended cement gradually reduce with increasing of incorporation amount of steel slag,and all the relationships between each period's strength of and incorporation amount of steel slag conform to the polynomial function relationship.