Preparation and Performance of Titanium-bearing Blast Furnace Slag Based Alkali-activated Cement
Using titanium-bearing blast furnace slag as cement mixture has been currently acknowledged as an effective way for its comprehensive utilization.Titanium-bearing blast furnace slag based alkali-activated cement was prepared by using titanium-bearing blast furnace slag as raw material,and the mixture of hydroxide(NaOH)and water glass(Na2O·nSiO2)as activator.The influences of activator modulus,activator content and curing temperature on the performance of titanium-bearing blast furnace slag based alkali-activated cement were investigated.The mineral phase compositions and microstructure of materials were analyzed through X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),and scanning electron microscopy/energy dispersive X-ray spectroscopy(SEM/EDS).The results show that the activator modulus,activator content and curing temperature have important influence on the compressive strengths of samples.The compressive strength of samples with activator modulus of 1.6 and activator content of 8%reach up to 26.6 MPa after curing for 3 d at 65℃.The reaction variation content of amorphous phase and crystalline(i.e.perovskite CaTiO3)are 6.77%and 5.95%,respectively,which indicates that the titanium-bearing blast furnace slag is corroded and activated with alkali activator to promote the formation of C-S-H gels,thereby accelerating the development of compressive strength of materials.
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