AVOIDING SALT DAMAGE TO BITUMINOUS SURFACINGS: RESULTS FROM A ROAD TRIAL 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 crystalizes within the pavement, physically disrupting the bituminous surfacing and causing premature deterioration of the road. The criteria were derived 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 investigated. 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)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09684093
• Corporate Authors:

  TRL

  Crowthorne House, Nine Mile Ride
  Wokingham, Berkshire  United Kingdom  RG40 3GA
• Authors:
  • WOODBRIDGE, M E
  • Obika, B
  • FREER-HEWISH, R
  • NEWILL, D
• Publication Date: 1994

Language

• English

Media Info

• Features: References;
• Pagination: 26 p.
• Serial:
  • TRL PROJECT REPORT
  • Issue Number: PR 91
  • Publisher: TRL
  • ISSN: 0968-4093

Subject/Index Terms

• TRT Terms: Bituminous materials; Crystallization; Loss and damage; Pavement design; Prevention; Seal coats; Sodium chloride; Standards; Subgrade (Pavements)
• Geographic Terms: Botswana
• ITRD Terms: 4955: Bituminous materials; 8011: Botswana; 7194: Crystallisation; 1614: Damage; 3055: Pavement design; 9149: Prevention; 7332: Salt (chem); 187: Specification (standard); 2950: Subgrade; 2984: Surface dressing
• Subject Areas: Highways; Pavements; Security and Emergencies;

Filing Info

• Accession Number: 00677430
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: May 25 1995 12:00AM