Evaluation of Geotechnical Properties of Sub-Grade Material Used in Road Construction

Bereket Admasu


The aim of this research is evaluation of geotechnical properties of sub grade material used in Bukur-Setera road construction. Tests conducted in laboratory for gravel material are grain size analysis, atterberg limit, free swell, maximum dry density and optimum moisture content. The material strength test was conducted interms of California bearing ratio. Because of less finer materials, the percentage of swelling is low. Gravel materials involved in this investigation have taken a larger CBR value of 21% for 5mm penetration. According to ERA 2013 manual, the materials having good to excellent subgrade materials, having CBR value greater than or equal to 30%. But the actual values are less than 30%.  Accordingly, it has a limitation of using the material as sub grade materials.

Keywords: Laboratory test, Sub grade, California Bearing Ratio

DOI: 10.7176/CER/11-1-04

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ISSN (Paper)2224-5790 ISSN (Online)2225-0514

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