Effect of Gypsum in Proportion of Other Additives Used in Stabilizion of Deficient Soils: A Review

Soils viable for engineering works needs to attain certain strength properties in order to serve its intended purpose. Some available soil like Black Cotton Soil tends to show weakness in strength which necessitate it to be modified so that the desired strength can be achieved, this can be executed using materials that could improve the soil properties such as gypsum, lime, bagasse ash, cement, etc. This paper is a review of the viability of the use of gypsum in proportion to other stabilization material to improve the strength properties of soils. Research shows, gypsum in addition to other stabilization materials such as bagasse ash, rice husk, lime, NaCl, tin, fly ash, jute fibre etc. produce a better stabilized soil as compared to gypsum or any of this material as stand-alone stabilizer. Laboratory result after series of experiment to determine the Maximum Dry Density and Optimum Moisture Content, Unconfined compressive strength, California bearing ratio CBR and Atterberg limit values of the stabilized soil using gypsum with other additives, reveals that for effective soil stabilization with the use of gypsum and any other additives is a function of the type of soil being stabilized, nature of additives, percentage of applied additives, curing time, also the classification of the soil to stabilized. It is found that the use of these additives in proportion of each other, their percentage proportioned, curing time and the nature of soil, give different end point of stabilized soil.