超细粉煤灰作为电厂废弃物具有分布广、细度模数小的特点,将其掺入水泥中配制成超细粉煤灰水泥浆液,可以提高浆液的流动性和可注性。以水灰比、超细粉煤灰掺量和水玻璃掺量为主要因素进行正交试验,测定了所配浆液的胶凝时间、黏度、结石率等物理性能指标,并对结果进行极差分析、方差分析和回归分析;研制出一种新型胶凝时间可控的超细粉煤灰水泥浆液,并回归出胶凝时间预测公式;对所配浆液进行可注性模型试验。结果表明:在水灰比为0.8、超细粉煤灰掺量为70%、水玻璃掺量为15%时,超细粉煤灰水泥浆液具有良好的胶凝时间和黏度,与普通水泥浆液相比具有更好的可注性。

As the waste of power plant,widely distributed ultra-fine fly ash is of small modulus of fineness, hence improves the fluidity and groutability of cement slurry by mixing with cement. In this paper, orthogonal tests were carried out with water cement ratio, ultra-fine fly ash content and sodium silicate content as main factors. The physical properties such as gelation time, viscosity and stone rate of the slurry were determined. On the basis of range analysis, variance analysis and regression analysis results, a new type of fly ash cement slurry with controllable gelling time was developed, and the formula of predicting gelling time was regressed. Finally, the groutability of the slurry is examined through model test. The research findings demonstrate that ultra-fine fly ash cement slurry with water cement ratio as 0.8, ultra-fine fly ash dosage 70%, and sodium silicate content 15% is of fast gellation and good viscosity, and better grouting performance compared with ordinary cement slurry.