AN ASSESSMENT OF LOCALLY OCCURRING MATERIALS FOR USE AS SURFACE DRESSING AGGREGATE IN BOTSWANA. DURABILITY AND PERFORMANCE OF BITUMINOUS HIGHWAY MATERIALS, HATFIELD POLYTECHNIC, 3-4 APRIL 1989

This paper describes the physical, mechanical, chemical and petrographic properties of three different materials which may be used as surfacing aggregate for two of the major new road projects planned to cross the kalahari region in botswana. Of the three materials one was described initially as a calcrete, another a silcrete and the third was a boulder deposit from a river bed. One of the materials (sekoma aggregate) was used in the road surfacing trials reported herein. In assessing the results of the investigation a comparison is made with the existing botswanan specifications for the use of surfacing aggregates and also with others which have been used elsewhere for lightly trafficked roads where relaxation of standards has been permitted.(a) for the covering abstract of this conference see IRRD 823743.

• Corporate Authors:

  Hatfield Polytechnic, England

  School of Engineering, College Lane, P.O. Box 109
  Hatfield, Hertfordshire,   England 
• Authors:
  • Woodbridge, N E
  • Greening, PAK
  • Scott, M J
• Publication Date: 1989

Language

• English

Media Info

• Pagination: 17 p.

Subject/Index Terms

• TRT Terms: Aggregates; Carbonates; Conferences; Developing countries; Durability; Experimental roads; Pavement design; Petrography; Properties of materials; Rock mechanics; Soils; Standards; Surfacing
• Uncontrolled Terms: Low cost roads
• Geographic Terms: Botswana
• Subject Areas: Geotechnology; Highways; Materials; Pavements;

Filing Info

• Accession Number: 00498708
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Sep 30 1990 12:00AM