RESISTANCE TO WEAR OF DIFFERENT BITUMINOUS MIXTURES FOR SURFACE COURSES WITH DISCUSSION

AN INCREASING WEAR OF SURFACE COURSES HAS BEEN OBSERVED IN GERMANY SINCE STUDDED TIRES CAME INTO USE. PRACTICAL EXPERIENCE POINTS OUT THAT SPECIAL MIXTURES LIKE GUSSASPHALT (HOT MELTED ASPHALT) OR SPECIAL AGGREGATES HAVE A DECREASING TENDENCY FOR WEAR UNDER THESE CONDITIONS. TO DESIGN MATERIALS THAT ARE RESISTANT TO WEAR AND SKIDDING, LABORATORY TEST METHODS ARE NEEDED THAT ALLOW A PREDICTION OF PRACTICAL BEHAVIOR. IN FOLLOWING THIS TASK A TEST PROCEDURE BASED ON THE BRITISH "APPARATUS FOR ACCELERATED POLISHING" (BRITISH STANDARD BS 812) WAS DEVELOPED. THE TEST PROGRAM CONSISTED OF THE FOLLOWING ESSENTIAL VARIATIONS: ASPHALT CONCRETE WITH LOW AND WITH HIGH CONTENT OF AIR VOIDS; GUSSASPHALT (HOT MELTED ASPHALT); MASTIMAC AND MASTIPHALT--SPECIAL ASPHALTIC CONCRETE WITH A HIGH CONTENT OF COARSE AGGREGATE THAT IS EMBEDDED IN A MATRIX WITH HIGH CONTENT OF FILLER AND BITUMEN; ADDITIONS OF PLASTIC MATERIAL TO THE BITUMEN; AND DIFFERENT TYPES OF SMALL SIZE COARSE AGGREGATES. FURTHER VARIATIONS IN THIS PROGRAM ARE THE TEST TEMPERATURE AND THE PRELIMINARY TREATMENT (FREEZE-THAW). ESSENTIAL CONCLUSIONS FROM THIS PROGRAM ARE: THE PAVEMENT WEAR INCREASES WITH HIGHER TEMPERATURES AND AFTER A PRELIMINARY TREATMENT WITH FREEZETHAWING CHANGES, ESPECIALLY WITH OPEN MIXTURES. GUSSASPHALT AND THE SPECIAL MIXTURES WITH A HIGH COARSE AGGREGATE CONTENT HAVE A SIGNIFICANTLY HIGHER RESISTANCE TO WEAR THAN USUAL ASPHALTIC CONCRETES. THE TYPE OF AGGREGATE IS OF ESSENTIAL INFLUENCE, ESPECIALLY IN OPEN ASPHALTIC CONCRETES (A RELATION TO LOS ANGELES VALUES CAN BE SEEN). THE ADDITION OF PLASTIC MATERIAL TO BITUMEN WILL ONLY INFLUENCE WEAR FOR LOWER TEST TEMPERATURES. WITH THE EXPERIENCES OF THIS PROGRAM FURTHER INVESTIGATIONS FOR THE DEVELOPEMENT OF WEAR RESISTANT MATERIALS WILL BE MADE. WITH GUSSASPHALT AND THE SPECIAL MIXTURES WITH HIGH CONTENT OF COARSE AGGREGATE THE FIRST STEPS TOWARD REACHING THIS OBJECTIVE HAVE BEEN TAKEN. A DISCUSSION IS INCLUDED WHICH DEALS WITH VARIOUS QUESTIONS CONCERNING THIS STUDY. /AUTHOR/

• Supplemental Notes:
  • 2 APP
• Authors:
  • Kohler, G
  • TAPPERT, A
• Conference:
  • Association of Asphalt Paving Technologists Proceedings
• Publication Date: 1972

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 188-214
• Serial:
  • Volume: 41

Subject/Index Terms

• TRT Terms: Asphalt concrete; Bituminous mixtures; Coarse aggregates; Durability; Freeze thaw tests; Gussasphalt; Laboratory tests; Pavements; Plastics; Skid resistance; Studded tires; Temperature
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 00211820
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 17 2002 12:00AM