ABSTRACT
In the instance of the Nipost-Akpu route, pavement breakdown has significantly led to the loss of life, interruption of routine daily activities, and increase in transportation costs. The purpose of this study is to look at the reasons behind the pavement failure on the Nipost-Akpu route in Asaba, Delta State, and to suggest solutions to lessen the hardship on that pavement. The investigation found that potholes, alligator cracks, raveling, and failed portions were the specific types of pavement failure on this route. The Nipost-Akpu road in Asaba, Delta State, Nigeria has been the subject of an investigation into the reason for road breakdown. Analysis of soil samples was done to determine what went wrong along the research region. The following tests were carried out on samples that were removed from the defective road portions and delivered to the lab: the California Bearing Ratio (CBR) Test in accordance with B.S.1377:1990, Moisture Content, Particle Size Distribution (Sieve Analysis), Atterberg Limit, Compaction, and the Atterberg Limit Test. According to the study's physical characteristics, the maximum dry density varies from (0.70- 0.73g/cm3) and the sieve examination of the soil sample revealed that it ranges from (25.9%- 32.21%). The California Bearing Ratio (CBR) Test reveals that the soil runs from (7.04–82.23%), the Atterberg Limit Test reveals that the liquid limit ranges from (45–50%), which is common for clay soils, and the optimal moisture level ranges from (14.40–15.53%). Low CBR and low MDD were found to be the root causes of failure in the research region according to the Federal Ministry of Works and Housing. Due to this, the soils are unsuitable for use as building materials for roads, necessitating the necessity for stabilization during road rebuilding and rehabilitation, as well as the installation of broader drainage systems and regular road maintenance.
