In order to promote a better utilization of Bayer red mud as a kind of cementitious material in cemented backfill materials,and at the same time to solve the security problem of stockpiling of Bayer red mud,the hydrat...
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In order to promote a better utilization of Bayer red mud as a kind of cementitious material in cemented backfill materials,and at the same time to solve the security problem of stockpiling of Bayer red mud,the hydration mechanism and cementitious properties of Bayer red mud with the active action of carbide slag and desuifurization gypsum were investigated by using the analyses of X-ray diffraction,Fourier translation infrared spectroscopy,difference scanning calorimetry-thermogravimetric,scanning microscope techniques,inductively coupled plasma optical emission spectrometry and compressive strength of the hardened *** results indicate that the hydration reaction of Bayer red mud is greatly promoted and the mechanical properties of cementitious materials are significantly improved after adding flue gas desuifurization gypsum into Bayer red mud-carbide slag *** hydration mechanism is that in Bayer red mud-carbide slag-flue gas desuifurization gypsum system,a large number of extremely low solubility ettringite is generated in hydration *** to the rapid crystallization of ettringite,the concentration of activated alumina in the system is reduced greatly,further promoting mass dissolution of soluble aluminum in Bayer red mud with ettringite continuing to be *** the other hand,as the amount of aluminum dissolution leads residual silicon to be activated in Bayer red mud which continuously generates the C-S-H gel and other hydration products,this leads to the hydration of red mud continuously.C-S-H gel and ettringite are the main strength source of this *** Cementitious material was prepared with Bayer red mud,carbide slag and flue gas desuifurization *** mechanism and cementitious properties were investigated.A large number of extremely low solubility ettringite is *** concentration of activated alumina in the system is reduced greatly due to the rapid crystallization of *** the amount of alumi
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