Soil stabilization is an effective method to amend clayey soils. This study investigates the potential of using silica sand (SS), and hydrated lime (HL) to stabilize clayey soil. The samples were examined for unconfined compression, direct shear, and 1D-consolidation experiments. Unconfined compression test was carried out for 2.5%, 5%, 7.5%, and 10% SS that were subjected to 0, 7, 14, 28, and 90-day curing periods. The chemical composition of the used materials’ was found utilizing X-ray Fluorescence (XRF) investigation. The stabilization process increases the samples’ unconfined compressive strength (UCS) that contain 5%HL and 7.5%SS (after 90 days of curing) by more than 4-fold (418.9%) compared to the non-amended samples. Also, a greater increase in shear strength parameters for the samples that contained 5%HL and 7.5%SS (cured for 28 days) compared to the non-amended samples. The coefficients of consolidation and expansion index reduced due to the addition of 5%HL, and 7.5%SS. These compounds were considered as the optimal amounts and showed the highest mechanical strength in direct shear and consolidation tests. Scanning electron microscope (SEM) results revealed that clay fabric modification was caused by the particle interaction with HL and SS, resulting in bonding formations and hardening. The best-obtained mixture of 5%HL and 7.5% SS can be successfully used to stabilize clayey soils, which might be a viable alternative to cement.