BITUMEN-SAND MIXES FOR ROAD BASES

THE COST OF BITUMEN-SAND MIXES CAN BE REDUCED BY USING LESS BITUMEN THAN IS NECESSARY FOR SURFACE DURABILITY, PROVIDED THEY ARE SURFACE-DRESSED TO PROTECT THEM FROM ABRASION. TO DETERMINE WHETHER A ROAD BUILT USING THIS TECHNIQUE GIVES ADEQUATE PERFORMANCE, A SERIES OF EXPERIMENTAL MIXTURES WAS LAID ON THE MAIDUGURI-BAMA ROAD IN NORTHERN NIGERIA EARLY IN 1960. THE MIXTURES WERE MADE WITH UNHEATED SAND AND THREE CUT-BACK BITUMENS OF DIFFERENT VISCOSITY. TWO SECTIONS OF CEMENT-STABILIZED SAND WERE LAID FOR COMPARISON. THIS REPORT CONTAINS A BRIEF DESCRIPTION OF THE EXPERIMENT TOGETHER WITH THE CONCLUSIONS WHICH EMERGED FROM OBSERVATIONS DURING MIXING AND LAYING AND DURING SIX YEARS UNDER TRAFFIC. THE RESULTS SUGGEST THAT, WITH THE LIGHT TRAFFIC ON THIS TYPE OF ROAD, SAND-MIXES MADE WITH LOW BINDER CONTENTS, AND SURFACE-DRESSED SHORTLY AFTER LAYING, ARE VERY SATISFACTORY. BITUMEN CONTENTS OF 2 TO 3 PERCENT COULD BE USED WITH A VISCOUS CUT-BACK BITUMEN PROVIDED THE SAND IS WARMED TO 40-50 DEGREES C. /AUTHOR/

  • Supplemental Notes:
    • Rrl Rept 239, 12 PP, 4 FIG
  • Corporate Authors:

    Road Research Laboratory /UK

    ,    
  • Authors:
    • Williams, F H
  • Publication Date: 1968

Subject/Index Terms

Filing Info

  • Accession Number: 00211426
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Jan 12 1970 12:00AM