WHOLE LIFE PERFORMANCE OF LOW VOLUME SEALED ROADS IN SOUTHERN AFRICA

Since 1994, TRL in collaboration with a number of road authorities and consultant partners has been engaged in extensive studies of the performance of low volume sealed roads within Southern Africa. The roads included in service primary and secondary roads with ages varying from thirty years old to relatively new roads and specially constructed experimental sections. The roads examined were located in Botswana, Malawi, Zambia and Zimbabwe. This paper contains a summary of the new materials specifications and design requirements for low volume sealed roads derived from studies in the region and describes the experimental design and performance of studies of secondary and feeder roads in Zimbabwe which have been crucial to the derivation of recommendations. The observed rates of deterioration on these roads are compared with those predicted by the Highway Development and Management tool HDM-4, in order to derive appropriate calibration factors for cracking, rutting and roughness progression models. These have then been applied in an economic evaluation to derive life-time costs of sealed roads built to different standards. (A) For the covering abstract see ITRD E105699.

• Corporate Authors:

  TRL

  Crowthorne House, Nine Mile Ride
  Wokingham, Berkshire  United Kingdom  RG40 3GA
• Authors:
  • MOROSIUK, G
  • Gourley, C
  • Toole, T
  • Hine, J
• Publication Date: 2000

Language

• English

Media Info

• Features: References;
• Pagination: p. 25-32
• Serial:
  • TRL ANNUAL RESEARCH REVIEW 1999
  • Publisher: TRL

Subject/Index Terms

• TRT Terms: Base course (Pavements); Durability; Life cycle analysis; Maintenance; Performance; Subgrade (Pavements)
• Uncontrolled Terms: Low cost roads
• Geographic Terms: South Africa; Zimbabwe
• ITRD Terms: 5910: Durability; 5950: Life cycle; 2986: Low cost road; 3847: Maintenance; 8094: Rhodesia; 2961: Roadbase; 8103: South Africa; 2950: Subgrade
• Subject Areas: Highways; Maintenance and Preservation;

Filing Info

• Accession Number: 00796567
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Aug 2 2000 12:00AM