AAU-ETD AAU-ETD
 

Addis Ababa University Libraries Electronic Thesis and Dissertations: AAU-ETD! >
Faculty of Technology >
Thesis - Geotechniques >

Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1555

Title: ASSESSEMENT OF ROAD FAILURES CONSTRUCTED ON RED CLAY SOILS OF WESTERN ETHIOPIA AND THEIR REMEDIAL MEASURES
Authors: HAGOS, GEBRETSADIK
Advisors: Messele Haile (Ph.D)
Copyright: 2006
Date Added: 22-Oct-2008
Publisher: Addis Ababa University
Abstract: Some part of the land of Ethiopia is covered with expansive soils and some with nonexpansive. For this reason, roads could be constructed in areas of expansive or non expansive soils. Structural failures are observed in roads constructed on expansive soils as well as in roads constructed on non-expansive soils. Hence, investigation is made to study the types and causes of road failures constructed on red clay soils of Western Ethiopia. Visual survey was made on the Addis Ababa- Jimma, Addis Ababa-Goha Tsion and Addis Ababa-Nekempte roads. From the visual survey, it is found that the route from Addis Ababa to Nekempte, especially near the town Bako which is located around 251km due west of Addis Ababa, is severely damaged. Due to this reason, this road is chosen for further investigation. The investigation covers field tests carried out to determine the insitu condition of the road materials and laboratory tests on the collected samples in order to determine the engineering properties of the materials. From the field and laboratory tests, an attempt was made to examine whether the materials used are at their optimum moisture content and maximum dry density. Since the performance of road is also greatly influenced by the engineering property of the underlain soil and the natural environmental conditions, an attempt was made to determine the adequacy of the underlain material to serve as a subgrade for road construction. Another study with the title “Further investigation of road failures constructed on expansive soils of central Ethiopia, Addis Ababa – Jimma road as a case study” was made by Awoke Sime in the year 2005. The study investigated causes of failures of roads constructed on expansive soils of central Ethiopia, where expansive soil is prevalent. Hence, comparison was made on the types and causes of failures of roads constructed on red clay soils with that of the roads constructed on expansive soils by comparing with the above work. From the field tests and laboratory tests carried out, it is observed that the failure of roads constructed on red clay soils is mainly due to the inadequacy of the base layer for the current 16 traffic loading and due to the poor construction of the materials used over the subgrade. Whereas the failure of roads constructed on expansive soils is mainly due to the expansive nature of the subgrade material
Description: A Thesis submitted to the School of Graduate Studies of Addis Ababa University in partial fulfillment of the requirements for the Degree of MASTERS OF SCIENCE in GEOTECHNICAL ENGINEERING.
URI: http://hdl.handle.net/123456789/1555
Appears in:Thesis - Geotechniques

Files in This Item:

File Description SizeFormat
HAGOS GEBRETSADIK .pdf9.11 MBAdobe PDFView/Open

Items in the AAUL Digital Library are protected by copyright, with all rights reserved, unless otherwise indicated.

 

  Last updated: May 2010. Copyright © Addis Ababa University Libraries - Feedback