RELATIONSHIP BETWEEN COMPOSITION AND PHYSICAL PROPERTIES OF ASPHALT AND DISCUSSION

THE PURPOSE IS TO RELATE THE COMPOSITION OF ASPHALT WITH THE NORMAL PHYSICAL TESTS APPLIED TO PAVING GRADE ASPHALT CEMENTS. THIS WAS DONE BY SEPARATING ASPHALT INTO ITS FOUR GENERIC FRACTIONS, PREPARING VARIOUS TWO-COMPONENT RECONSTITUTED ASPHALTS, AND THEN OBSERVING THE CHANGE IN PROPERTIES WITH RESPECT TO THE VARIATION IN COMPOSITION. AMONG THE CONCLUSIONS WERE THE FOLLOWING: (1) THE PHYSICAL PROPERTIES OF EACH OF THE FOUR GENERIC FRACTIONS ARE DISTINCTLY DIFFERENT FROM EACH OTHER. (2) THE FLUIDITY OF AN ASPHALT INCREASES (HARDNESS DECREASES) BY THE PLASTICIZING EFFECT OF THE LIQUID FRACTIONS (SATURATES AND NAPHTHENE-AROMATICS ON THE SOLID FRACTIONS (POLAR-AROMATICS AND ASPHALTENES). (3) THE COMBINATION OF EITHER THE SATURATES OR THE NAPHTHENE-AROMATICS WITH ASPHALTENES IMPROVES THE TEMPERATURE SUSCEPTIBILITY, AND THE COMBINATION OF POLAR-AROMATICS WITH ASPHALTENES MAKES THE TEMPERATURE SUSCEPTIBILITY POORER. (4) DUCTILITY IS LARGELY DEPENDENT UPON THE PRESENCE OF POLAR-AROMATICS WHILE THE OTHER THREE FRACTIONS CONTRIBUTE VERY LITTLE IF ANYTHING TO DUCTILITY. (5) FLOW RESISTANCE (SOFTENING POINT) IS INCREASED BY THE COMBINATION OF SATURATES OR NAPHTHENE-AROMATICS WITH ASPHALTENES, AND IS DECREASED BY THE COMBINATION OF SATURATES WITH POLAR-AROMATICS. /AUTHOR/

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Filing Info

  • Accession Number: 00211664
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 25 1971 12:00AM