基于响应曲面法的磷石膏地聚物注浆材料配比优化

Optimization of the ratio of phosphogypsum geopolymer grouting materials based on response surface method

以烘干球磨后的原状磷石膏、粉煤灰、矿渣粉为主要原料,生石灰作为激发剂,制备磷石膏地聚物注浆材料(PGGM)。采用响应曲面法中的Box-Behnken设计,探究磷石膏掺量、生石灰掺量、液固比对PGGM流动度、凝结时间和抗压强度的影响及揭示强度形成机理,构建回归模型,探究各因素及其之间交互作用的影响程度,获得性能最优配比。结果表明:三因素对各响应值影响显著,交互项存在部分显著,各因素与响应值呈二次多项式模型,各模型的回归系数R2皆大于0.99,表明模型合理且拟合性好。当磷石膏掺量为56.08%、生石灰掺量4.43%、液固比0.34时,PGGM各项性能基本满足固化软土的相关要求。

Phosphogypsum ground polymer grouting material(PGGM)was prepared by using the original phosphogypsum,fly ash and slag powder after drying ball milling as the main raw materials and quicklime as the activator.Box-Behnken design in response surface method was used to explore the influences of phosphogypsum content,quicklime content,liquid-solid ratio on PGGM mobility,setting time and compressive strength,and reveal the formation mechanism of strength.Regression model was built to explore the influence degree of each factor and their interaction,and obtain the optimal ratio of performance.The results show that three factors have significant influence on each response value,and some interaction terms are significant.Each factor and response value are quadratic polynomial models,and the regression coefficient R 2 of each model is greater than 0.99,indicating that the model is reasonable and well fitted.When the content of phosphogypsum is 56.08%,the content of quicklime is 4.43%and the liquid-solid ratio is 0.34,the properties of PGGM basically meet the related requirements of solidified soft soil.