基于胶空比的水泥基材料固化土强度预测模型OA

The influence of cement content and soil properties on the strength of cement-stabilized soil(CSS)has been widely studied.However,the underlying mechanism between the pore-filling effect of hydration products and strength development remains insufficiently investigated.This study introduced the gel/space ra-tio(GSR)as a novel parameter to quantify the efficacy of hydration products in filling the pores of CSS and developed a strength prediction model based on GSR.The effects of initial porosity,cement-based material dosage,hydration degree,and volume expansibility on GSR were quantified through thermogravimetric analy-sis and specific gravity measurements.Meanwhile,unconfined compressive strength(UCS)tests were per-formed on CSS specimens with different curing ages,initial porosities,and cement-based material dosages,thereby validating the effectiveness of the prediction model.The results show that GSR exhibits a positive lin-ear correlation with cement-based material dosage,hydration degree,and volume expansibility,and a nega-tive linear correlation with initial porosity.An exponential relationship was identified between GSR and UCS.The proposed single-parameter strength prediction model based on GSR shows a maximum error of 14.44%and an average error of 5.41%,demonstrating that GSR can serve as a key indicator for evaluating CSS strength and has good potential for application in CSS strength design.