SALT DAMAGE TO BITUMINOUS SURFACINGS: RESULTS FROM ROAD TRIALS IN BOTSWANA

The paper discusses the results of research undertaken in Botswana to provide design criteria to avoid damage inflicted on thin bituminous surfaces by soluble salt. The damage, characteristic of warm arid or semi-arid regions of the World, occurs when the salt crystallizes within the pavement, physically disrupting the bituminous surfacing and causing premature deterioration of the road. The criteria were worked out from observations made on a road trial constructed in May 1990 in northern Botswana where the salt levels at which damage occurred and the nature and development of the damage were determined. Some preventative measures were incorporated in the trials to determine their efficacy in avoiding damage. The results from the trials have enabled a revision of the current Botswana road design standards with respect to salt limits in pavement materials to be proposed. (A) For the covering abstract of the conference see IRRD 873950.

• Corporate Authors:

  STEERING COMMITTEE CAPSA '94

  PO BOX 6946
  ROGGEBAAI,   South Africa  8012
• Authors:
  • WOODBRIDGE, M E
  • Obika, B
  • FREER-HEWISH, R
  • NEWILL, D
• Conference:
  • PROCEEDINGS OF THE 6TH CONFERENCE ON ASPHALT PAVEMENTS FOR SOUTHERN AFRICA, CAPSA '94, HELD CAPE TOWN OCTOBER 1994. VOL 1
• Publication Date: 1994

Language

• English

Media Info

• Features: References;
• Pagination: I149-I162

Subject/Index Terms

• TRT Terms: Bitumen; Conferences; Deterioration; Drainage; Sodium chloride; Standards; Surfacing; Test procedures
• Geographic Terms: Botswana
• ITRD Terms: 4963: Bitumen; 8011: Botswana; 8525: Conference; 5255: Deterioration; 2937: Drainage; 7332: Salt (chem); 187: Specification (standard); 2972: Surfacing; 6288: Test method
• Subject Areas: Data and Information Technology; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00714391
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Dec 27 1995 12:00AM