DYNAMIC TESTS ON THE STABILITY OF BITUMINOUS MIXTURES FOR PAVEMENT AT LOW TEMPERATURE, PART 2: EXPERIMENTAL RESEARCHES ON RUBBER BLENDED ASPHALT AND ASPHALT MIXTURES

INVESTIGATIONS ON THE EFFECTS OF THE INCLUSION OF RUBBER WITH THE BITUMINOUS MATERIALS USED IN PAVING MIXTURES WERE MADE AT LOW TEMPERATURES DOWN TO -50 C. THESE TESTS WERE CONCERNED WITH THE CHANGES OF PHYSICAL PROPERTIES THAT OCCUR WHEN NATURAL RUBBER POWDER WAS BLENDED WITH PETROLEUM ASPHALTS. THIS REPORT SHOWS THAT NATURAL RUBBER POWDER IN THE AMOUNT OF 3 TO 10 PERCENT AFFECTS THE PHYSICAL PROPERTIES OF ASPHALTS. THE CHANGES IN THE PHYSICAL PROPERTIES OF A GIVEN ASPHALT BECOME MORE PRONOUNCED WITH INCREASES IN THE RUBBER CONTENTS IN THE ASPHALT OR IN THE ASPHALT MIXTURES. IN GENERAL, THE IMPACT RESISTANCE WAS INCREASED BY THE ADDITION OF RUBBER, WHILE THE PENETRATION WAS AFFECTED BY THE HEATING TIME AND THE METHOD OF BLENDING. IN SOME CASES, ALTHOUGH THE PENETRATION DECREASED, VALUES OF OTHER FACTORS UNDER TEST INCREASED. SOFTENING POINT AND VISCOSITY INCREASED, DUCTILITY DECREASED. IT WAS ONLY IN THE TEST OF ELASTIC PROPERTIES OF ASPHALT MORTAR MEASURED BY A SONIC DEVICE, THAT MARKED DIFFERENCES WERE FOUND. THE TEST PAVEMENT WAS CONSTRUCTED BY THE AUTHORS AS A PART OF THE WATTSU SECTION BETWEEN SAPPORO CITY AND CHITOSE AIR PORT. THIS TEST ROAD WAS SUBJECTED TO HEAVY SERVICE OF WINTER TRAFFIC. AFTER ONE WINTER OF SERVICE, IT WAS CLEAR THAT THE RUBBER BLENDED ASPHALT PAVEMENT HAD HIGH RESISTANCE TO ABRASION. FURTHERMORE THE UTILITY OF RUBBER BLENDED ASPHALT PAVEMENT WAS CONFIRMED. THE ULTIMATE OBJECT OF THESE STUDIES IS TO IMPROVE THE BITUMINOUS PAVEMENT IN COLD DISTRICTS. /AUTHOR/

  • Supplemental Notes:
    • Vol 10, No 1 /NO 43/, PP 59-88
  • Authors:
    • Itakura, C
    • Sugawara, T
  • Publication Date: 1955-9

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  • Accession Number: 00210856
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 13 1994 12:00AM