Incorporation of a nanotechnology-based product in cementitious binders to mitigate soil heave

Sulphate-induced heaving in soils, often caused by calcium-based binders, leads to ettringite mineral growth. “RoadCem” (RC), a nanotechnology-based additive, has shown potential to reduce this heaving. Research focused on substituting cement with ground granulated blast furnace slag (GGBS) and adding RC to sulphate-bearing soil stabilizers. Lab tests, including swelling and compression, were conducted. Results showed a 67% reduction in heave with 1% RC and 50% CEM I replaced by GGBS and RC. RC outperformed GGBS alone, showing almost 30% more heave reduction. Unsoaked soil strength increased with RC inclusion, and scanning electron micrographs revealed significant reduction in ettringite minerals with RC.