PERFORMANCE OF SECTIONS OF THE NAIROBI TO MOMBASA ROAD IN KENYA

Details are given of the performance of sections of the Nairobi-Mombasa road in Kenya. Nine sections of road with cement-stabilised bases surfaced with multiple seals, and three sections 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. It was found that the lightly constructed sections with cement-stab lised bases had suffered little structural damage after carrying 6000000 equivalent standard (80kN) axles, considerably more than would be predicted by current methods of pavement design. The more heavily constructed sections with asphaltic concrete surfacings are performing broadly as would be expected. For both types of pavement, deterioration hs 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. (Author)

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  • Corporate Authors:

    Transport and Road Research Laboratory

    Old Wokingham Road
    Crowthorne RG11 6AU, Berkshire,   England 
  • Authors:
    • Smith, H R
    • JONES, T E
    • JONES, C R
  • Publication Date: 1980

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Filing Info

  • Accession Number: 00319321
  • Record Type: Publication
  • Report/Paper Numbers: Lab Rpt. 886
  • Files: TRIS, ATRI
  • Created Date: Dec 30 1980 12:00AM