FULL SCALE EXPERIMENTS WITH THIN BITUMINOUS SURFACINGS IN AYRSHIRE

IN 1950 AND 1951 230 EXPERIMENTAL SECTIONS OF THIN BITUMINOUS SURFACINGS WERE LAID ON THE DUMFRIES-KILMARNOCK TRUNK ROAD, A.76, WHICH CARRIED SOME 500 COMMERCIAL VEHICLES A DAY IN 1950, AND 124 SECTIONS ON THE IRVINE-STEWARTON ROAD, B. 769, WHICH CARRIED ONLY ABOUT 45 COMMERCIAL VEHICLES PER DAY OF TRAFFIC. THE OBJECTS OF THESE EXPERIMENTS WERE TO COMPARE THE PERFORMANCE OF DIFFERENT TYPES OF THIN SURFACING, RANGING FROM OPEN-TEXTURED TO DENSE MATERIALS, UNDER THE WEATHER CONDITIONS OF THE SOUTH-WEST OF SCOTLAND, AND TO FIND THE MOST SUITABLE RANGES OF BINDER CONTENT FOR EACH TYPE OF MATERIAL, WHEN USED FOR RESURFACING A TRUNK ROAD AND A MINOR RURAL ROAD. THE AGGREGATES USED WERE BASALT, GRANITE AND BLASTFURNACE SLAG FROM LOCAL SOURCES. THIS REPORT GIVES THE RESULTS OF THE EXPERIMENT BASED ON VISUAL ASSESSMENTS. THE RANGES OF BINDER CONTENT FOUND MOST SUITABLE FOR EACH TYPE OF MATERIAL ON ROADS CARRYING 500 AND 45 COMMERCIAL VEHICLES A DAY ARE GIVEN. THE MAIN CONCLUSIONS FROM THE EXPERIMENT ARE: (1) THE BINDER CONTENTS OF THE MOST SATISFACTORY BITUMENS MACADAM COMPOSITIONS ARE WITHIN OR A LITTLE ABOVE THE RANGE SPECIFIED IN B.S. 1621: 1961; THESE MATERIALS GAVE GOOD RESULTS FOR AT LEAST 10 YEARS ON BOTH ROADS; (2) THE BEST RESULTS FOR FINE COLD ASPHALT WITH SLAG AGGREGATE WERE GIVEN BY COMPOSITIONS COMPLYING WITH B.S. 1690; WITH THE BASALT AGGREGATE USED IN THE EXPERIMENT HOWEVER THE OPTIMUM BINDER CONTENT ON THE TRUNK ROAD WAS RATHER LOWER THAN THAT GIVEN IN B.S. 1690, (3) THE TAR CARPETS GAVE POOR RESULTS EXCEPT UNDER VERY LIGHT TRAFFIC, AS DID THE D.T.S., DUE, IT IS THOUGHT, TO THE WEATHER CONDITIONS DURING LAYING, (4) THE THIN ROLLED-ASPHALT SURFACING GAVE GOOD RESULTS WHEN LAID IN FAVORABLE WEATHER CONDITIONS, AND (5) THE OPTIMUM BINDER CONTENT OF A BITUMINOUS SURFACING MIXTURE IS DETERMINED BY THE NATURE OF THE AGGREGATE, THE TYPE OF MIXTURE AND THE INTENSITY OF THE TRAFFIC. THE RANGE OF WEATHER CONDITIONS IN GREAT BRITAIN DOES NOT AFFECT THE OPTIMUM BINDER CONTENT. /RRL/

  • Supplemental Notes:
    • 33 Pp, 3 FiG, 13 TAB, 12 REF
  • Corporate Authors:

    MINISTRY OF TRANSPORT, LONDON (UK)

    ,    

    Road Research Laboratory /UK

    ,    
  • Authors:
    • BARNES, H G
    • Woodford, G C
  • Publication Date: 1968

Subject/Index Terms

Filing Info

  • Accession Number: 00211192
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS, ATRI
  • Created Date: Apr 4 1971 12:00AM