关键词: 钢渣粉, 矿物掺合料, 水泥砂浆, 抗压强度, 活性指数

Abstract: In order to solve the problem of low activity index of steel slag powder as admixture，steel slag was mixed with fly ash，lithium slag and phosphorus slag to obtain multiple composite admixture.Through the mechanical performance test，the influence of the admixture ratio on the activity of the binary and ternary steel slagbased multisolid waste admixture was discussed.XRD and SEM were used to analyze the hydration products and microscopic morphology of typical admixtures.The results show that steel slag exhibits lower activity in the early and late stages，lithium slag has good early activity，and phosphorous slag has poor early strength.Among the binary admixtures，the steel slaglithium slag has the highest activity and is greater than the two alone.The steel slag and the lithium slag are hydrated in an alkaline environment and provide different active components，which is beneficial to the improvement of the strength of the mortar.When the steel slagphosphorus slag powderlithium slag compounding ratio is 5∶1∶4 in the ternary admixture，the compressive strength of the mortar is the highest，and the compressive strength of the 28 d mortar is 37.21 MPa.While steel slag and lithium slag undergo hydration reaction，the phosphorous slag silicate glass body dissociates active SiO2 under the excitation of alkaline environment，and more hydration products such as C—S—H are generated.Steel slag，lithium slag and phosphorous slag have a certain coupling effect.

Key words: steel slag powder, mineral admixture, cement mortar, compressive strength, activity index