Laboratory investigation demonstrates that dolomite powder enhances strength and reduces swelling in marl soils, indicating its viability as a sustainable stabilizer.
Water absorption increases saturation in marl, weakening inter-particle bonds and reducing soil strength. This study investigates dolomite powder (DP) as an eco-friendly stabiliser, testing 1, 2.5, 5, 8, 12, 15, and 18% DP at curing ages of 0, 7, 14, and 28 days via UCS, direct shear, and consolidation tests. Results demonstrate that 8% DP produces a 2.8-fold increase in UCS after 28 days of curing, with the rate of strength gain being most pronounced within the first 14 days. Addition of 5% DP enhances cohesion and internal friction angle by 1.74 and 1.21 times, respectively, while reducing compression and swelling indices by 24.1% and 37%. Beyond these optimum contents, higher DP contents decrease strength and increase consolidation coefficients. XRD confirms pozzolanic reactions through reduced quartz, calcite, and dolomite over 7–28 days. SEM and EDX reveal that strength improvement at optimum DP arises from C-S-H formation and pore structure refinement.
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Rajabi et al. (2026) studied this question.
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