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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

LABORATORY EVALUATION OF POLYMER-MODIFIED BITUMEN AND POLYMER-MODIFIED ASPHALT --BITUMEN, FLEXIBLE AND DURABLE. 3RD EUROBITUME SYMPOSIUM 1985, THE HAGUE, NETHERLANDS, SEPTEMBER 11-13, 1985

This paper compares the different types of polymer-modified bitumens and their influences on the behaviour of asphaltic concrete under a wide range of various temperatures. Five polymer-modified bitumens produced in a refinery and five bitumens 80/100 modified under laboratory conditions with different polymer additives were tested, while bitumen 80/110, bitumen 60/70, and bitumen 40/50 were used as reference bitumens. The test procedures used included the standard tests of consistency, such as fraass breaking point, softening point as well as penetration and ductility at different temperatures, the test of torsional recovery, toughness and tenacity, the evaluation of viscosity and visco-elastic parameters in the balance rheometer at temperatures ranging from 25 deg c to 175 deg c, thermal resistance and tendency to separate. The asphaltic concrete with the different types of binders was examined at high temperatures using Marshall test, gyrator test and wheel tracking test. Dynamic tensile bending test was applied at medium and low temperatures. The results of the tests can be summarized as follows: the modification of bitumen with polymers causes an increase in consistency at high temperatures, whereas there is a different effect at low temperatures, due to a change in susceptibility to temperature. The properties of polymer-modified bitumens depend on the type and sort of bitumen and on the type, quantity and way of mixing of the additives. The efficiency of the polymer components of the binders is quite different. Some polymer-modified bitumens hardly have more effects than a harder gradation of the bitumen, others have a measurably positive effect upon the behaviour of asphaltic concrete at high temperatures without reducing the flexibility at low temperatures. The standard tests of consistency only allow a characterization of the binders, the significance of its results, however, may differ from those of conventional bitumen. Special tests like the torsional recovery test as well as toughness and tenacity test are necessary to assess the specific qualities of the polymer-modified bitumens, whereas the visco-elastic parameters facilitate a more in-depth evaluation. Statistical evidence has shown a clear relation between the visco-elastic parameters and the results of gyrator test, wheel tracking test and dynamic tensile bending test carried out under the same test conditions. The elastic potential of the binders described in the elastic modulus decreases with increasing temperature, whereas the influence on the resistance to permanent deformation of asphaltic concrete grows. Some polymer-modified bitumens show a considerably slower decrease in the elastic potential than conventional bitumen. At decreasing temperatures the influence of the viscous potential described in the loss modulus increases, because the viscous qualities allow a deformation of the asphalt and thus as well a relaxation of stress. In brief an increase

  • Corporate Authors:

    EUROBITUME

    BD EMILE BOCKSTAEL 351
    Bruxelles, ZZ Belgique   
  • Authors:
    • Kolb, K H
  • Publication Date: 1985

Language

  • Undetermined

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Filing Info

  • Accession Number: 00482148
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 30 1989 12:00AM