Review Article

On the Recent Trends in Expansive Soil Stabilization Using Calcium-Based Stabilizer Materials (CSMs): A Comprehensive Review

Table 4

Summary of advantages and disadvantages of calcium-based stabilizer materials (CSMs).

StabilizerAdvantagesDisadvantages

Ca based materials (CSMs): lime [12, 104106], cement [107], FA [12, 24], SF [108], GGBS [109], BA [76, 110], CCR [72], POFA [111], GSA [93](i) Long-term strength is achieved as a result of pozzolanic reaction which is time-dependent and lasts for longer duration.(i) The release of deleterious substances contaminate the underground water. The “ultimate” strength gain reaches several years.
(ii) Lime-treated soils undergo immediate modification resulting in a relatively denser microstructure and higher strength.(ii) These cause adverse environmental and economic concerns by vast CO2 emissions. At early modification stages, lime makes the soil less dense.
(iii) In viewpoint of economy, usually small amount of material is required as compared with non-CSMs.(iii) The variation in site conditions with those simulated in a laboratory often leads to marginal errors.
(iv) The rate of strength gain is much higher and faster in soil stabilized using cement.(iv) The brittle failure is undesirable with respect to structural stability.
(v) The PI reduction by lime is the highest for problematic Mt. Alternatively, using quicklime due to its elevated reaction temperature enables stabilization in cold regions.(v) The effect of lime modification in clays containing quartz is almost negligible due to the increased period of curing is essential.
(vi) The most commonly used materials comprising aluminosilicates include GGBS and fly ash.(vi) Class F fly ash contains low calcium and thus requires an activator in order to be used as the stabilizer material.