Performance of Sections of the Nairobi to Mombasa Road in Kenya

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Performance of Sections of the Nairobi to Mombasa Road in Kenya

H. R. Smith / T. E. Jones / C. R. Jones

Details are given of the performance of sections of the Nairobi-Mombasa road in Kenya. Nine sections of road with cement-stabilized bases, surfaced with multiple seals, and three sectons with crushed rock bases and asphaltic concrete surfacings have been studied for seven years. These road sections are located in a dry area, on strong subgrade soils. For both types of pavement, deterioration has been mainly confined to the surfacings, and timely resealing has a powerful effect in limiting the amount of patching required and in maintaining an acceptable level of surface roughness. The lives of the better quality seals have been of the order of four to five years. Deflection measurements clearly show how variations in overall pavement strength are affected by changes in annual rainfall, and the wide variation in strength which can occur on a nominally uniform pavement. Deflection measurements did not give early warning of pavement surfacing failures. (Copyright (c) Crown Copyright 1980.)