Effects of a Full-Solid Waste-Based Soil Stabilizer: Strength, Durability and Microstructure

Abstract

This study investigates the use of a low-carbon soil stabilizer called SDG, which is made up of granulated blast furnace slag (GGBFS), desulfurization gypsum (DG), and calcium carbide slag (CCS), to solidify the soil. The impact of SDG components on the strength and durability of solidified soil was analysed through a series of tests, including unconfined compressive strength, water stability coefficient, water absorption rate, drying-wetting cycles, and shrinkage tests. Furthermore, microstructure characteristics were analysed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The study shows that the solidified soil has excellent strength and durability when the SDG stabilizer contains 60% GGBGS, 10% DG, and 30% CCS. Additionally, increasing the DG content negatively affects the soil’s resistance to water. The SDG stabilizer has potential chemical cementitious characteristics and the calcium carbide slag is rich in calcium ions, which undergo an ion exchange reaction with minerals in the soil. These findings offer new ideas for the development of soil stabilizers.

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