A red mud-based cement admixture, its preparation method and application

Abstract

The application discloses a red mud-based cement admixture and a preparation method and application thereof, and belongs to the technical field of materials. The red mud-based cement admixture is prepared by taking red mud and blast furnace slag as raw materials, preparing light porous red mud microspheres through alkali activation and dispersion suspension method, and depositing hydroxyapatite on the surface of the red mud microspheres in situ, and the red mud-based cement admixture has a rough structure on the surface. The red mud-based cement admixture can effectively improve the interfacial compatibility with a cement matrix, the hydroxyapatite deposited on the surface can provide nucleation sites for cement hydration, promote the generation of hydration products, meanwhile, the internal pores of the microspheres and the rough structure on the surface can prolong the heat conduction path, reduce the thermal conductivity of the material, improve the heat insulation performance of the cement mortar, and help to improve the early mechanical properties. The application realizes the high-value utilization of the red mud through a relatively simple preparation process, and provides a new method for the development of green cement-based materials with heat preservation and insulation and mechanical regulation functions.

Images