Research on the Performance of Calcium Carbide Slag–Fly Ash Stabilized Soil

To address the scarcity of lime resources, this study explores the potential of using industrial solid waste, including fly ash (FA) and carbide slag, as replacements for lime or cement in soil stabilization for roadbed construction. The optimal mixing ratio of FA and calcium carbide slag (CCS) was determined using compaction and unconfined compressive tests. The study also examines the relationship between the optimum moisture content and the maximum dry density of the FA and CCS binder, as well as the strength variation trend. The study investigated the optimal mixing ratio of FA–CCS-stabilized soil, and the strength variation trend of FA and carbide slag-stabilized soil under different age and mixing ratios, using tests such as the unconfined compressive energy test, splitting strength test, compressive modulus of resilience test, and California bearing ratio test. Results indicate that the optimal mixing ratio of FA and CCS binder is 1 : 4, the advocated mixing ratio of CCS-stabilized soil is 8 : 92, and the excellent mixing ratio of CCS–FA-stabilized soil is 8 : 32 : 60.