ULTRA-THIN BONDED PREMIXES FOR ROAD MAINTENANCE ("MEDIFLEX") --BITUMEN, FLEXIBLE AND DURABLE. 3RD EUROBITUME SYMPOSIUM 1985, THE HAGUE, NETHERLANDS, SEPTEMBER 11-13, 1985

UN ENROBE TRES MINCE ET DRAINANT "LE MEDIFLEX" AU SERVICE DE L'ENTRETIEN ROUTIER

The surface properties of roads ultimately deteriorate under the combined effect of traffic and weather regardless of the care taken in construction, of the wearing surface especially. Common distress includes changes in road profile, especially the transverse profile, loss of surface roughness and cracking. It used to be common practice to correct these faults either by adding new wearing courses or by regenerating and regrading the old road bed. When renewing the surface, the engineer can use surface coatings or premix or (more recently) rough cold-poured micro-surfacings to suit road type and traffic density. For both preventive and remedial maintenance, the choice of premix was either conventional rolled asphalt in normal thicknesses, gap-graded premix in thinner layers and "pinned" sandasphalts with chipped surfaces. The weight per square metre of road area was usually more than 70 kg. A new retread process (mediflex) is described. The two underlying principles are (i) an ultra-thin rolled asphalt will perform satisfactorily on an old road if it can be intimately bonded with the underlying material and (II) the new surface must have exceptional strain-at-failure and cohesion to resist shear and other stresses. These two requirements are satisfied firstly by using a 1/10 gap-graded bitumen-and filler-rich rolled asphalt reinforced with short fibres, and secondly, by using elastomer bitumen for a good bond. The composition and performance of this material is described. Methods of preparation and spreading the bonding layer and the wearing course are discussed, together with areas of application. The article concludes with many examples of motorway and urban road applications.(a) for the covering abstract of the symposium see IRRD 815173.

• Corporate Authors:

  EUROBITUME

  BD EMILE BOCKSTAEL 351
  Bruxelles, ZZ Belgique   
• Authors:
  • Tessonneau, D
• Publication Date: 1985

Language

• Undetermined

Media Info

• Pagination: p. 377-80
• Serial:
  • Publication of: EUROBITUME
  • Publisher: EUROBITUME

Subject/Index Terms

• TRT Terms: Adhesion; Bituminous mixtures; Cold coated materials; Conferences; Cracking; Deterioration; Drainage; Elastomers; Fibers; Material reinforcement; Reinforcing materials; Repairing; Rolled asphalt; Smoothness; Strength of materials; Thickness
• Uncontrolled Terms: Transverse profile
• Subject Areas: Data and Information Technology; Hydraulics and Hydrology; Maintenance and Preservation;

Filing Info

• Accession Number: 00482120
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Apr 30 1989 12:00AM