A METHOD FOR THE DESIGN OF MULTIPLE SURFACE TREATMENTS BASED ON THE RESULTS OF THREE ROAD SURFACING EXPERIMENTS

A SERIES OF ROAD EXPERIMENTS WERE CARRIED OUT IN DIFFERENT CLIMATIC AREAS ON ROADS CARRYING DIFFERENT AMOUNTS OF TRAFFIC TO COMPARE THE DIFFERENT METHODS OF SURFACE TREATMENT COMMONLY IN USE UNDER PROPERLY CONTROLLED CONDITIONS. ONCE THE RELATIVE PERFORMANCE WAS ESTABLISHED THIS WOULD ENABLE THE MOST ECONOMICAL METHOD TO BE USED IN PRACTICE FOR A PARTICULAR SET OF CIRCUMSTANCES. THREE EXPERIMENTS ARE CONSTRUCTED ON ROADS CARRYING BETWEEN 250 AND 1000 VEHICLES/DAY. THE METHODS INVESTIGATED INCLUDED SINGLE, DOUBLE AND TRIPLE SURFACE TREATMENTS AND SEVERAL VARIATIONS OF THE WELL KNOWN 'CAPE SEAL' METHOD INCLUDING THE USE OF SLURRY SEAL. THE PERFORMANCE OF THE DIFFERENT METHODS TESTED IN THE THREE EXPERIMENTS AFTER PERIODS VARYING BETWEEN 4 1/2 AND 8 YEARS AFTER CONSTRUCTION. THE RESULTS INDICATED THAT THE PERFORMANCE CAN BE RELATED TO THE BINDER-AGGREGATE RATIO AND THE SPREAD OF DATA OBTAINED ENABLED DESIGN CURVES TO BE DRAWN FOR ROADS CARRYING BETWEEN 250 AND 1000 VEHICLES/DAY. IT SEEMS THAT A NUMBER OF THE DOUBLE AND TRIPLE SURFACE-TREATMENT SPECIFICATIONS USED IN THE PAST HAVE NOT INCORPORATED SUFFICIENT BINDER FOR OPTIMUM DURABILITY, AND OTHER SPECIFICATIONS ARE SUSCEPTIBLE TO FATTING UP. SOME RELATIVE COSTS OF CONSTRUCTION ARE GIVEN FOR THE DIFFERENT METHODS TESTED IN TWO OF THE EXPERIMENTS. THE MORE EXPENSIVE METHODS HAVE NOT NECESSARILY PERFORMED BETTER THAN CHEAPER METHODS. THIS INDICATES THE IMPORTANCE OF SELECTING THE BEST METHOD FOR GIVEN CONDITIONS IN PRACTICE AND ALSO THAT CAREFUL ATTENTION TO DESIGN IS NECESSARY. /RRL(A)/

  • Supplemental Notes:
    • 14 Pp, 4 FiG, 3 TAB, 14 REF
  • Corporate Authors:

    Conf Asphalt Pavements Proc /S Africa

    ,    
  • Authors:
    • Walker, R N
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00205662
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Jul 12 1971 12:00AM