Effects of high temperature activation and curing methods on properties of red mud-mineral composites
Using activated Bayer red mud and mineral powder as raw materials,mortar specimen were prepared by mixing red mud and mineral powder in a ratio of 70:30.The study focused on the influence of activation methods of red mud and curing methods on the mechanical strength,reaction products,and microstructure of red mud-mineral powder composite materials.The results showed that under the same curing method,the mechanical strength of the specimens made from the calcined red mud at 800℃was about 20％higher than that of the specimens made from the red mud treated by direct drying at 105 ℃,with a higher degree of compactness.Under the same activation method,the specimen cured by heat curing at 60 ℃ for 24 h followed by membrane cur-ing at 20 ℃ had the highest compressive strength at 3d,but the specimen produced more obvious cracks,resulting in a decrease in strength of the specimens as the curing time increased,and the specimen under the standard curing method had the highest com-pressive strength at 28 d.
Bayer red mudcuring methodshigh temperature activationmechanical strengthreaction productsmicrostructure
万方数据
维普
