The study examined the pavement indices of Ado-Ajebandele road that influences its failure. This particular road is experiencing different forms of road failure. In order to determine some pavement indices influencing failure of the road, twelve samples of soil, three each from a failed segment, where it was observed to be experiencing a critical failure were collected for laboratory examination. Classification, Compaction, California Bearing Ratio test were considered for the assessment of the pavement parameters that contribute to failure were conducted on the samples. The results of the test showed that, the soil has a high water retention capacity, with the natural moisture content ranging between 7.7 and 14.5% for base course (BC), between10,5 and 17.5 for sub base(SB) and between 12 and 19% for sub grade for all the locations considered. The liquid limit ranged between 29 and 45% for base course, between 29 and 44.5% for sub base and between 31 and 48% for sub grade (SG). The liquid limit showed that, majority of the failed section fell above the allowable limit for base course materials. The compaction showed that, the Maximum dry density(MDD)(kg/m3) values were quite low for base course(BC), with the MDD varied between 1510 kg/m3and 1940 kg/m3 that fell below the minimum specified values for sub base(SB) ,MDD is varied between1320 kg/m3 and2020 kg/m3 in which most values fell below the minimum specified. Similarly, the CBR values for location 1-4 varied between 26% 106% for base course, between 31% and 114% for sub base and between 28.3% and 120% for sub grade. The CBR analysis showed that failure occurred due to poor Base course materials, Poor sub grade underlying the pavement and effect of ground water due to high water table. However, the results of this research will, to a great extent assist the civil Engineer in the area of designing and construction of roads that can stand the test time.

Full text: IJEIR_1637_Final.pdf