Causes of pavement early deterioration and its remedial messures: case study in agaro – dedesa road

Abstract

This study has been conducted in Agaro-Dedesa Road segment which is located in western Oromiya regional state to identify causes of pavement early failure and to recommend remedial measures. The existing engineering properties of the pavement materials, have been the causes of road failure and the extent of defects were evaluated based on this possible measures to meet its design life without further pavement deterioration have been recommended. In order to determine in-situ conditions of road material previous study in the area and document from the client has been collected. In addition to this, necessary laboratory tests were carried out on representative samples extracted from the site. The data obtained from the field investigation and laboratory tests were analyzed and interpreted by explanatory and comparative analytical methods. Normal test procedures have been used to investigate the property of the soil, even though there may be a possibility that the soil in the study area can be lateritic soil type The results of the study showed that the causes of early deterioration of the pavement are weakness of subgrade material, pavement material quality, thickness of base and sub base course. In addition to these, premature failure has been induced due to poor compaction of pavement layers during construction. Based on this, it recommended that the subgrade soils shall be replaced or stabilized chemically/mechanically to meet the pavement design life