Strengthening of Expansive Clayey Subgrade Pavements by using Geotextile and Admixture

Authors

  • N. Vijay Kumar, SS. Asadi, D. Satish Chandra, P. Guruswamy Goud, B. Bhanu Prasad

Abstract

In urban areas, the administration lifetime of pavement on poor soil sub-grade is influenced because of its high compressibility and plasticity behavior. These soils have high moisture content, less strength and CBR values. In addition to these, the seasonal changes also affect the soil properties. In order to defeat these problems, the properties of soft sub-grade soil must be enhanced through soil stabilization. Geo-synthetics materials stabilize the soil and to reduce the thickness of flexible pavements. Geo-synthetics are the financially savvy ground alteration material which builds the security and bearing limit of the soil. The various types of soil stabilization are: Soil stabilization with “cement, lime, bitumen, Chemical stabilization” and a new rising technology of improvement by Geo-textiles and Geo-synthetic fibers. In this work we are using combinations of Geo-textile (43.75mm, 87.5mm, 131.25mm heights from bottom of the mould) and admixture (GGBS: 0% - 40%) to know the consequences when they are mixed with expansive soils. From the CBR values obtained the optimum placement of geotextile and GGBS are found to be 3.91 and 30% respectively. The (UCS) value is found to be high i.e., 0.545kg/cm2 when 30% GGBS is added. From the results it is found that, by placing the geotextile at 131.25mm and addition of GGBS of about 30% has improved the strength of the soil by 80%.
Keywords: Expansive soil, Geotextile, GGBS, Compaction Characteristics, CBR, UCS, FSI.

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Published

2020-05-18

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Articles