为有效治理碱渣和粉煤灰,利用两者制备新型注浆材料。通过室内试验,分析研究了由硅酸钠和石膏组成的复合激发剂当中,石膏掺量对注浆材料凝结时间、流动度、无侧限抗压强度和结石体抗冻融性的影响,并辅以SEM和XRD手段,对影响规律做出解释。结果表明:随着石膏所占比例增大,注浆材料性能整体趋势为凝结时间缩短、流动度降低、抗压强度上升,但石膏所占比例在10%之前,凝结时间和抗压强度呈相反变化趋势;石膏掺量越大,结石体冻融循环强度损失值也越大,且前5次冻融使强度下降最显著,之后下降趋势趋于平稳;掺入石膏后体系中有钙矾石生成。研究成果可为碱渣-粉煤灰注浆材料的改良与应用提供参考。

A new type of grouting material is prepared by using soda residue and fly ash. The influence of the dosage of gypsum, a component together with sodium silicate in compound activator, on the setting time, fluidity, unconfined compressive strength, and freeze-thaw resistance of the slurry was examined. The influence regularity was expounded in association with SEM and XRD approaches. Results demonstrated that: with the increase of gypsum dosage, setting time shortened, fluidity declined, while compressive strength increased; on the contrary, before gypsum dosage reached 10%, the variation tendency of setting time and compressive strength was the opposite. The larger the proportion of gypsum, the greater the strength loss of the stone during freeze-thaw cycles, and such strength loss during the first five freeze-thaw cycles was the most remarkable and then tended to be stable. Ettringite was generated in the slurry system after the addition of gypsum. The research findings provide reference for the improvement and application of soda residue-fly ash grouting material.