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Effect of Fly Ash and Geo Synthetics on Strength Properties of Clayey Soil

B. Kasi Annapurna Devi*, P. Arti Sudam**

* PG Scholar, Department of Civil Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, India.

** Assistant Professor, Department of Civil Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, India.

Periodicity:September - November'2016
DOI : https://doi.org/10.26634/jste.5.3.8252

Abstract

When Civil engineers are encountered with clayey soils and if construction on such soils is inevitable, replacement may not be an economic solution. Stabilizing it with an additive such as fly ash is a renowned technique. The present study deals with stabilization of clayey soil with fly ash in different proportions (i.e. 0%, 15%, 25%, and 35% fly ash by weight). Also, soil and soil - fly ash mixtures are reinforced with Geosynthetics like Geogrid and nonwoven Geotextile. Small scale direct shear test & modified direct shear tests are conducted on unreinforced (without Geosynthetic) and reinforced (with Geosynthetic) soil - fly ash mixture samples respectively and their shear strength properties are determined from their corresponding direct shear test values. In reinforced samples, the Geosynthetic is placed at the middle of the shear box having the soil (or soil – fly ash mixture) at the top and bottom of the shear box and modified direct shear test is conducted. Whereas, in unreinforced sample both the halves of the shear box contain only soil samples. The Unconfined compressive strength test is conducted on unreinforced soil and soil - fly ash mixtures. The soil is classified as CI according to Indian Standards. The test results indicated improvement of shear strength by the addition of fly ash for unreinforced 2 soil being 25% fly ash mix to have maximum shear strength of 0.89 kg/cm and for reinforced soil-fly ash mixtures with 2 reinforcement as Geotextile and Geogrid, 15% fly ash showed maximum shear strength of 0.61 kg/cm , and 0.76 2 kg/cm respectively.

Keywords

Clayey Soil, Fly Ash, Direct Shear Test, Geosynthetics.

How to Cite this Article?

Devi, B.K.A., and Sudam, P.A (2016). Effect of Fly Ash and Geo Synthetics on Strength Properties of Clayey Soil. i-manager’s Journal on Structural Engineering, 5(3), 16-24. https://doi.org/10.26634/jste.5.3.8252

References

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Effect of Fly Ash and Geo Synthetics on Strength Properties of Clayey Soil

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