THE ROLE OF RESEARCH IN THE PROMOTION OF INDIGENEOUS COAL TAR IN ROAD CONSTRUCTION IN SOUTHERN AFRICA: A REVIEW OF PROGRESS IN THE YEARS 1952-1971
The properties of road tars which affect their in-service performance are reviewed with special reference to research undertaken by the National Institute for Road Research. For single surface treatments it is shown that very low-volatile tars are required and a specification for tar for this purpose, which was recently proposed by the Institute, is provided. Economic aspects of the use of tar as opposed to more expensive binders are considered, and it is shown that by using tar a substantial saving in construction costs can be obtained. This can amount to as much as 13% of the initial cost of a surface treatment, and 14% of the cost of base or levelling course construction. As a result of the Institute's research work, recommendations are made as to the use of tars in various types of construction.
National Institute of Road Research, South AfricaP.O. Box 395
Pretoria, Transvaal, South Africa
- Jamieson, I L
- Cillie, F P
- Publication Date: 1971
- Features: References; Tables;
- Pagination: 26 p.
- TRT Terms: Binders; Construction; Costs; Durability; Performance; Specifications; Surfacing; Tar
- Uncontrolled Terms: Construction costs
- ITRD Terms: 4948: Binder; 5910: Durability; 255: Economics; 8103: South Africa; 2972: Surfacing; 4984: Tar; 6255: Test
- Subject Areas: Construction; Finance; Highways; Materials; Pavements; Vehicles and Equipment;
- Accession Number: 00081097
- Record Type: Publication
- Source Agency: Transport and Road Research Laboratory (TRRL)
- Report/Paper Numbers: RB/23/71 R&D Rpt.
- Files: ITRD, TRIS
- Created Date: Mar 26 1975 12:00AM