Cementitious Material Stabilization in Sandy Soils

Cementitious stabilisation of sandy soils harnesses the binding capacity of cement-based and alternative binders to improve the mechanical and durability properties of naturally loose, cohesionless sediments. Traditional Portland cement reacts with water to form calcium silicate hydrates that glue individual sand grains into a more coherent matrix, increasing stiffness, reducing permeability and mitigating erosion. Emerging approaches combine cement with supplementary cementitious materials—such as fly ash, silica fume or zeolite—to refine pore structure and enhance long-term strength through pozzolanic reactions. Geopolymer binders, formed by alkali activation of aluminosilicate precursors, offer a lower-carbon alternative that generates a cross-linked polymeric network embedding sand particles. Biological methods, notably microbial-induced calcite precipitation, exploit bacterial metabolism to deposit calcium carbonate within pore spaces, delivering strength gains under ambient conditions. Applications span road subbases in arid regions, coastal dune reinforcement, airport runway construction and earthquake-resistant foundations. Key challenges include achieving uniform binder distribution in high-permeability sands, controlling curing regimes in field conditions and balancing environmental impacts of binder production with the need for resilient infrastructure in diverse climatic settings.

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Cementitious Material Stabilization in Sandy Soils publication trend

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Technical terms

Cementitious material: Substance that sets and hardens by chemical reaction, binding soil particles into a cohesive mass.
Unconfined compressive strength (UCS): Maximum axial compressive stress a soil specimen can bear without lateral confinement.
Geopolymer: Inorganic binder synthesised by alkali activation of aluminosilicate sources, forming a cross-linked network with cement-like properties.
Microbial-induced calcite precipitation (MICP): Biochemical process in which bacteria precipitate calcium carbonate to cement soil grains.
Zeolite: Microporous aluminosilicate mineral used as a supplementary binder to promote pozzolanic reactions and refine pore structure.
Pozzolanic reaction: Chemical interaction between silica-rich additives and calcium hydroxide, producing additional cementitious hydrates.

References

1. Laboratory Study of the Effect of Zeolite and Cement Compound on the Unconfined Compressive Strength of a Stabilized Base Layer of Road Pavement. Materials (2022).