STUDY OF THE IMPROVEMENT AND UPGRADING OF PAVEMENT COURSES PERFORMANCE ---PRE CONFERENCE PROCEEDINGS 3RD IRF MIDDLE EAST REGIONAL MEETING. TOWARDS BETTER ROAD PERFORMANCE, RIYADH, SAUDI ARABIA, 13-18 FEBRUARY 1988. 6 VOLUMES.

A detailed study is presented of the stresses affecting the mechanical properties of asphalt mixes together with an investigation of the engineering properties of each on their constituents affecting their bearing capacity and durability. A review is presented of the requirements and characteristics of each type of road classified according to its expected service life. The author explains how to take advantage of the materials which improve performance and prolong serviceability, as follows: (1) increase the largest size of gravel used in the mixture; (2) reduce the quantity of asphaltic mortar in the mix, by reducing the rate of soft particles in the sand used; (3) increase the mix asphalt content, to be used as a stand-by resource in order to set off the oxidised asphalt as long as possible; (4) increase the rate of voids in the mix. This will take place by reducing the rate of sand soft particles when the size of coarse aggregate is increased. It will be preferable to apply this in asphalt base & intermediate courses; (5) limit the thickness of asphalt pavement courses to a maximum of 3 times the largest size of aggregate used. This is to allow the formation of the basic structure system of the coarse aggregate, without being impeded by the asphaltic mortar which responds slowly to flow in the aggregate voids during compaction. For the covering abstract of the proceedings see IRRD 817883.

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  • Accession Number: 00486957
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 30 1989 12:00AM