赤泥基复合水化晶种对硅酸盐水泥砂浆性能的影响OA

To enhance the efficient resource utilization of red mud in cement-based materials,this study prepared red mud-based composite hydration seeds(RM-CAW)via acid leaching pretreatment combined with hydrothermal synthesis,and incorporated them into cement mortar to systematically investigate their effects on cement hydration behavior,microstructure,and mechanical properties.Mechanical performance tests together with X-ray diffraction(XRD),thermogravimetric analysis(TG),scanning electron microscopy(SEM),and specific surface area and pore size distribution analyses were conducted to elucidate the strengthening mechanism of RM-CAW.The results indicate that the incorporation of RM-CAW significantly improves the mechanical properties of cement mortar at both 7 and 28 d.In particular,compared with reference cement mortar,the mortar with 5.0%(mass fraction)RM-CAW(HARM-5.0)specimen exhibits increases of 11.1%and 6.9%in flexural strength and compressive strength at 28 d,respectively.The addition of RM-CAW promotes the formation of hydration products such as calcium silicate hydrate(C-S-H),has a pronounced improvement in the interfacial transition zone and an overall densification of the matrix,and promotes pore structure refinement and a reduction in the proportion of large pores.