WAYS AND MEANS TO REDUCE DAMAGES TO ASPHALT COURSES ---PRE CONFERENCE PROCEEDINGS 3RD IRF MIDDLE EAST REGIONAL MEETING. TOWARDS BETTER ROAD PERFORMANCE, RIYADH, SAUDI ARABIA, 13-18 FEBRUARY 1988. 6 VOLUMES.

This paper studies roads constructed in different regions of the middle-east during the last 30 years and the different types of road deterioration caused by ageing. The main causes of such deterioration have been investigated, together with methods of prevention. A detailed analysis of the effect of each asphalt mix constituent material on the road serviceability, has also been carried out. The final recommendations are as follows: (1) analysis of the mineral characteristics of sand and of its conformity to specifications. If necessary, the sand shall be treated with an anti-stripping agent; (2) a geology engineer shall preferably be responsible for the project laboratory and for carrying out the investigation of the coarse aggregate mineral composition, and the level of pollution of sand with alkaline minerals; (3) limits on the project technical specifications, in order to limit the proportion of coarse gravel which weakens the basic structure of the gravel and can cause pot holes; (4) ascertain that the mineral filler is not the residue of the dust collector annexed to the asphalt mixing plant, except those residues coming from lime stone gravel; (5) avoid use of volcanic rock gravel. If impossible not to, chemical additives shall be added to the mix, as determined from previous field and laboratory tests, in order to avoid the ravelling of the road surface shortly after being opened to traffic; (6) satisfactory compaction and rolling of the pavement surfaces with three rollers to avoid corrugation or rutting; (7) keep a permanent thin asphalt coating layer on the pavement surface, and extensively use the various kinds of sealing coat to prevent cracking of the road surface; (8) careful monitoring of the pavement surface, after final acceptance in order to repair the damages which appear immediately as a result of bad mixing such as: (a) pot holes, (b) corrugation, (C) ravelling; (9) asphalt mix plant operators must have an experience certificate authenticated by the ministry of communications or any other technical organization authorised by the ministry. Organisation of special technical courses on the management and operation of the mixing plant; (10) enforcement of legislation on axle loads which must not exceed design loads. For the covering abstract of the proceedings see IRRD 817883.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/1022954X
• Corporate Authors:

  International Road Federation

  525 School Street, SW
  Washington, DC  United States  20024
• Authors:
  • Mnayer, O H
• Publication Date: 1988

Language

• Undetermined

Media Info

• Pagination: p. 5.573-5.60
• Serial:
  • Publication of: International Road Federation
  • Publisher: International Road Federation
  • ISSN: 1022-954X

Subject/Index Terms

• TRT Terms: Admixtures; Axle load force; Binders; Bituminous mixtures; Coarse aggregates; Compaction; Conferences; Deterioration; Developing countries; Flexible pavements; Gravel; Law enforcement; Mix design; Pavement corrugations; Pavement stripping; Potholes; Prevention; Rutting; Sand; Seal coats
• Geographic Terms: Egypt; Iran; Iraq; Kuwait; Oman; Saudi Arabia
• Subject Areas: Highways; Security and Emergencies;

Filing Info

• Accession Number: 00486955
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Sep 30 1989 12:00AM