钒钛矿渣制备全固废胶凝材料的初步研究

为大宗利用钒钛冶金渣,减少废弃物堆存及资源浪费。现利用承德钒钛矿渣、钢渣和脱硫石膏制备全固废胶凝材料,研究不同钒钛矿渣掺量、不同养护温度对胶砂试块抗压强度的影响,阐述钒钛矿渣-钢渣基胶凝材料的水化机理。结果表明:当水胶比为0.38,钒钛矿渣、钢渣、脱硫石膏分别占胶凝材料的58%、30%、12%时,制备的胶砂试块抗压强度最高。养护温度对胶砂试块早期抗压强度有明显影响,养护温度30℃时胶砂试块3 d抗压强度为养护温度45℃时3 d抗压强度的1.85倍。XRD、SEM、IR等分析表明:水化产物主要为钙矾石(AFt)和C-S-H凝胶;随着水化反应的进行,水化产物不断增多,C-S-H凝胶与AFt交错生长,结构致密,从而保证了胶砂试块抗压强度的增长。

Study on Preparation of Non-Clinker Cementitious Materials from Vanadium-titanium Slag

In order to use vanadium-titanium metallurgical slag， reduce waste storage and resources waste. Non-clinker cementitious materials were prepared by Chengde vanadium-titanium slag， steel slag and desulfurization gypsum. The influence of different vanadium-titanium slag content and different curing temperature on compressive strength of mortar sample was investigated. The hydration mechanism of the non-clinker cementitious materials was analyzed. The prepared cemented matrix has the highest compressive strength when the water to binder ratio is 0.38， and vanadium-titanium slag， steel slag， desulfurization gypsum account for 58%、30%、12% of the cementitious materials， respectively. Curing temperature had significant effect on the early strength of mortar test samples， the curing temperature increased from to 45 ℃， the 3 d comprehensive strength of mortar with curing temperature 30 ℃ is 1.85 times of 3 d comprehensive strength of mortar with curing temperature 45 ℃. The analysis of XRD， SEM and IR showed that hydrated products were mainly ettringite (AFt) and C-S-H gel. As the hydration reaction progresses， the number of hydration products increases， and the C-S-H gel grows alternately with AFt， which making the structure dense constantly， thus ensuring the strength of the mortar text sample.