Bio-Enzyme Stabilization of Red Clay Soil

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Addis Ababa University


Enzyme based liquid soil stabilizers have emerged as an alternative soil stabilization technique and are being introduced to the road construction industry, with an objective to improve the geotechnical properties of soils and ultimately reduce the overall cost of the projects. However, evidence to support the effectiveness of these products as stabilizer is based on manufacturer’s claims in their marketing brochures and manuals. Thus there is a need for an independent assessment of these products. Accordingly, this study is performed to evaluate the effect of TerraZyme which is an Enzyme based liquid stabilizer in improving the engineering properties of a red clay soil. Soil samples were collected from five different location in the northern part of Addis Ababa, and different laboratory tests were conducted on the soil samples with and without the application of TerraZyme. These tests include Particle Size Distribution, Plasticity Index, CBR and Unconfined Compressive Strength tests. The result obtained shows a slight increment in the UCS and CBR tests of the soil but the improvement is very small to warrant a large scale application of TerraZyme for red clay soil. Therefore, the type of soils in which the TerraZyme application can produce an optimal result should be investigated before applying TerraZyme on a large scale projects.



Bio-Enzyme, Red Clay Soil