Autoclaved aerated concrete prepared with high-silicon iron tailing
High-silicon iron tailing autoclaved aerated concrete(HIT-AAC)was prepared by using high-silicon iron tailing(HIT),and the influence of HIT fineness and calcium-silicon molar ratio(Ca/Si)on the slurry properties of HIT-AAC and the ba-sic physical and mechanicalproperties of the products were investigated.Combined with XRD,FTIR and SEM,the microscopic analysis of HIT-AAC products was performed.The tested results showed that with the increase of HIT fineness,the diffusion,gas generation rate and gas generation height of the slurry decrease,and the final gas generation time becomes shorter,while the dry density and compressive strength of products increase.With the increase of the Ca/Si,the diffusion of HIT-AAC slurry and the dry density of the product showed a fluctuating downtrend,the gas generation rate and gas generation height increased,the final gas generation time becames shorter,and the compressive strength showed a trend of first increasing and then decreasing.When the calcium silicon ratio is 0.65,the compressive strength is the highest,which is 4.29 MPa.Microscopic analysis showed that the hy-dration products were mainly quartz and tobemullite,and the morphology of the hydration products gradually changed from a nee-dle-like structure to a sheet-like structure with the increase of the Ca/Si.
high-silicon iron tailingautoclaved aerated concretefinenessCa/Sihydration products
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