Abstract:
This report describes a study of the performance of paved and unpaved roads undertaken in Kenya. This was part of a larger study designed to provide suitable relationships for use in a computer model capable of estimating the construction, maintenance, and road user costs throughtout the life of a road in a developing country. The paved road sample consisted of 39 sections located on surface-treated roads with cement-stabilized bases. The unpaved road sample consisted of 37 test sections located on properly engineered gravel roads (lateritic, quartzitic, volcanic, and coral). The deterioration of the surface of the paved roads was quantified in terms of surface roughness, amount of cracking, and depth of ruts. These parameters together with the transient deflections, California bearing ratio, and moisture content of the various pavement layers were monitored for a period of up to 4 years. The deterioration of unpaved roads was quantified in terms of surface roughness, depth of ruts, depth of loose surface material, and thickness of the gravel layer. These parameters were monitored for 2 years. Road deterioration was related to traffic loading, original design and construction standard of the roads, maintenance policy in use, and environmental conditions.
Supplemental Notes:
Proceedings of a work shop held June 16-19, 1975, in Boise, Idaho by the Transportation Research Board.
