An Investigation into Road Pavement Failure Susceptibility Indices of Osogbo-Iwo Road

Abstract

Osogbo-Iwo road in Osun state, Nigeria was investigated to determine failure susceptibility indices. The contribution of traffic[T], water table[D], geotechnical indices such as Maximum Dry Density and California Bearing Ratio[M] and [R], road cross-section elements such as cambering[A] and asphalt thickness[S] to road pavement failure were considered. The result showed a wide disparity between the specified Total TDRAMS Index(as shown by control Monitoringwell[MWC] ) and the Total TDRAMS Indices of the failed segments of the road up to 151%. This shows how wide the non-conformity in the construction of Osogbo-Iwo road is from the engineering specifications, both in material and in workmanship and it is the major part of what is responsible for the road’s incessant failure.

Keywords: TDRAMS, pavement failure, geotechnical indices, cambering