Soil Stabilization Technologies Using Industrial Byproducts
Summary
Soil stabilization using industrial byproducts has emerged as a sustainable alternative to conventional cement- and lime-based approaches, offering both environmental and economic benefits. By repurposing materials such as ground granulated blast-furnace slag, silica fume, flue gas desulfurization gypsum and phosphogypsum, engineers can enhance soil strength, reduce plasticity and control swell potential while diverting large volumes of waste from landfills. The underlying mechanisms typically involve pozzolanic reactions that generate cementitious gels, the formation of ettringite crystals that can fill pore space or induce controlled expansion, and microstructural densification that improves load-bearing capacity. Applications span road subbases, embankment support, landfill liners and foundation improvement, with field trials demonstrating reductions in unconfined compressive strength requirements and enhanced long-term durability. Despite these gains, challenges remain in predicting performance in sulphate-rich environments, managing potential expansion due to gypsum hydration, and establishing standardised mixing protocols. Ongoing research seeks to optimise blend ratios, assess life-cycle carbon footprints and develop predictive models for diverse soil types under varying climatic conditions.
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Soil Stabilization Technologies Using Industrial Byproducts publication trend
The graph below shows the total number of articles in soil stabilization technologies using industrial byproducts across all publications each year (not limited to Nature Index journals).
Technical terms
Pozzolanic reaction: Chemical reaction between silica-rich byproducts and calcium hydroxide forming cementitious calcium silicate hydrates.
Ground granulated blast-furnace slag (GGBS): A vitrified byproduct of iron production used as a supplementary cementitious material.
Flue gas desulfurization gypsum (FGD gypsum): Calcium sulfate byproduct from coal-fired power plants reused as a stabiliser.
Ettringite: A hydrated calcium aluminate sulfate mineral whose formation can fill soil pores or induce controlled expansion.
References
- Soil stabilization with gypsum: A review. Journal of Rock Mechanics and Geotechnical Engineering (2024).
- The Influence Mechanism of Ettringite Crystals and Microstructure Characteristics on the Strength of Calcium-Based Stabilized Soil. Materials (2021).
- Sulfate soil stabilisation with binary blends of lime–silica fume and lime–ground granulated blast furnace slag. Transportation Geotechnics (2022).
- Role of Gypsum Content on the Long-Term Performance of Lime-Stabilised Soil. Materials (2022).
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