Department of Civil Engineering
Permanent URI for this collectionhttps://repository.mu.edu.et/handle/123456789/149
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Item Improvement of Weak Sub base Materials Performance by Stabilization with Sand: A Case Study Wukro – Tsigereda Gravel Road.(Mekelle University, 2025-07-22) Asfaw Berhe GebreslassieRoad pavements commonly consist of several layers of various materials and thickness. The performance of a pavement depends on the quality of its subgrade and sub base layers. There are many soil stabilization methods to gain the required engineering properties. These methods range from mechanical to chemical stabilization. Chemical treatments are relatively expensive to be implemented in most developing countries and the best way is to use locally available materials with relatively cheap costs and affordable. A laboratory experiment carried out in this study which aimed to highlight the physical mechanisms of improvement of the weak sub base materials performance by Stabilize with sand. On the collected weak sub base soils from Bellesa quarry sites, Tsabat quarry sites and Tseartet quarry sites a laboratory tests such as Atterberg’s limit test, Grain Size Analysis, Compaction test, CBR and CBR Swell test were done for weak sub base and sand materials from river Suluh a laboratory tests such as Specific Gravity, Grain Size Analysis and water absorption for a sand. The result of the analysis reveals that the weak sub base materials were investigated and examined by mixing with sand. Thus, the mixtures used in the stabilization of weak sub base materials with sand were 0%, 10%, 20%, 30% sand content by weight. In conclusion the result shows that the addition of 0%, to, 30% sand content in to the weak sub base materials improves the CBR (%) values of weak sub base materials to Bellesa quarry sites from 20.3 to 39.7, to Tsabat quarry sites from17.0 to 32.1 and to Tseartet quarry sites from 9.8 to 31.7 respectively. The maximum dry density (g/cm3) of weak sub base materials are maximized to Bellesa quarry sites from 1.868 to 2.058, to Tsabat quarry sites from 1.14 to 2.156 and to Tseartet quarry sites from 1.775 to 2.036 respectively. And, the liquid limit (%) of weak sub base materials are minimized to Bellesa quarry sites from 24.6 to 19.65, to Tsabat quarry sites from 27.76 to 19.03 and to Tseartet quarry sites from 33.14 to 19.96 respectively and the other results are changed the result. This study relates to soil investigations data collected from worked laboratory. The provision of improved layer avoids the necessity of an extraordinary thick sub-base, and provides an adequate working platform for base course and surfacing compaction as well as reduces the risk of damage to the sub base during construction. The study objective was to identify variables that mainly contribute to the type, extents and severity level of the pavement distresses.