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

Bereket Admasu

doi:10.7176/cer/11-1-04

Abstract

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

Highlights

IntroductionThe gravel materials have been collected from the site near to the project
In this paper, the gravel materials have been collected from the site near to the project
The aim of this research is evaluation of geotechnical properties of sub grade material used in Bukur-Setera road construction

Summary

Introduction

The gravel materials have been collected from the site near to the project. The project area is found in 13km to west of Hossana town, south nation’s nationalities and peoples region, Ethiopia. Tested natural gravel materials were collected from Laignaw gana deposit area and used for construction of 22.97km from Bukur - Setera. Roads and highways are in the center of economic activities in countries where land based communication is dominant. The construction, operation and maintenance of the roadways play vital role in the economy. To get uninterrupted and sustainable service from the roadways, the first requirement is to construct the roads in such a way that these are able to withstand heavy traffic loads and weathering effects during the expected service life [Sheikh S, Nusaeir H., Abdul J. and Mohammad S., 2016]

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