Freeze-Thaw Resistance of Activated Red Mud Based Cementitious Materials
The utilization of red mud resources is of great significance for the sustainable development of the alumina industry and environmental protection.The article studied the freeze-thaw resistance of red mud based cementitious materials prepared by red mud and thermally activated red mud as the main raw materials,and various solid wastes as auxiliary materials such as steel slag.The working conducted freeze-thaw experiments on gel samples cured for 14 and 28 d,and characterized the strength,phases,microstructure,porosity of samples before and after freeze-thaw using universal testing machines,XRD,SEM,industrial CT and other detection methods.The freeze-thaw damage mechanism in samples also was discussed based on characterization results.The results show that there are significant differences in mass loss,strength loss and microstructure of cementitious materials prepared by the synergistic method of red mud and different industrial solid wastes before and after freeze-thaw.The freeze-thaw resistance of cementitious material prepared by red mud and ordinary Portland cement is significantly better than that of other red mud solid waste cementitious materials.Its mass loss and strength loss of sample cured for 14 d before and after freeze-thaw are 23.68％and 50.75％,respectively.The mass loss of red mud-steel slag cementitious material prepared from heat-activated red mud was reduced by 16.30％after freeze-thaw compared to that before freeze-thaw.
freeze-thaw damageactivated red mudsteel slagcementcementitious material
万方数据
维普
