Improvement of Strength Characteristics of Bio enzyme-Terrazyme treated Expansive soil by Gypsum as an Additive

Civil Engineering

In India large surface deposits are covered by Expansive soil, which have tendency to undergo volume change due to change in water content with seasonal variation.The problem with expansive soils has been recorded all over the world. The Surat City situated in South Gujarat region in India have majority of top soil as black cotton soil. Bio-enzyme is a natural, non-toxic, non-flammable, non-corrosive liquid enzyme formulation fermented from vegetable extracts that improves the engineering qualities of soil, reduce compaction efforts, increases the density and increases stability. The present study was conducted to investigate the performance of Gypsum on Bio Enzyme treated expansive soil. The Expansive soil stabilized with Bio-enzyme and Gypsum. The work investigates the effect of 2%, 4%, 6% Gypsum on TerraZyme treated soil with 200ml/1.5m3, 200ml/1.0m3,200ml/0.5m3and 200ml/0.25 m3. For different dosage of TerraZyme Atterberg Limit, Compaction test, UCS and CBR test was performed. Mainly study the influence on strength characteristics of 2%, 4%, 6% Gypsum with different dosage of TerraZyme treated soil after 7 days of curing periods. Also finding the effect of optimum dosage of 200ml/0.25 m3 TerraZyme with 6% Gypsum on CBR value after 21 days of air dry curing.

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