Study on the High Use Ratio of Red Mud in Cementitious Material

It is generally believed that red mud is one of the useful solid wastes in cementitious material because of its latent cementitious performance.However,the allowable ration of red mud in cement is very low and the strength of hardened cement paste has decreased deeply along with the increasing of red mud,thus,large amount of use of red mud has never been able to achievement.In this paper,by use of several testing methods,such as XRD、SEM、IR etc,the authors explained the mechanism of thermal activation of red mud.Combined red mud(50mass percent) with several other solid wastes and regulator which is produced by self,the strength of cementitious material sand grout can achieve the standard of 42.5# cement.Consequently,the realization of the massive utilization of red mud is feasible.