Study on the application mechanism and mechanics of steel slag in composite cementitious materials

摘要

Enormous demand and production for cement and concrete lead to a sharp increase in carbon dioxide emissions, and alternatives to cement are urgently needed to produce green cement and concrete. This paper is aimed at exploring the feasibility of using steel slag (SS) and granulated blast furnace slag (GBFS) to prepare cementitious materials. Mineral phases of SS are determined and observed by X-ray diffraction and backscattered electron microscopy. By measuring the compressive strength of mortar samples, the composite effect of SS-GBFS is analyzed and compared. Results show that SS can replace cement by 10%–30%, and the long-term strength of the prepared binary cementitious material is higher than that of cement. SS and GBFS can replace up to 50% of the cement. The strength of SS-GBFA-C ternary cementitious material is higher than that of SS-C, SS and GBFS promote mutually in cementitious materials.