Volume 25, Issue 4 (July 1997)

    Characterization of Styrene-Butadiene-Styrene Polymer Modified Bitumens—Comparison of Conventional Methods and Dynamic Mechanical Analyses

    (Received 28 August 1996; accepted 9 December 1996)

    CODEN: JTEOAD

      Format Pages Price  
    PDF Version 8 $25   ADD TO CART


    Abstract

    Rheological properties of styrene-butadiene-styrene polymer (SBS) modified bitumens were studied using conventional test methods (penetration, softening point, kinematic viscosity and Fraass breaking point) and dynamic mechanical analysis (DMA). The study indicated that SBS modification improved the viscoelastic properties of bitumens, which can be demonstrated using DMA but not conventional methods. Significantly improved properties of binders included increased dynamic mechanical moduli and decreased phase angle at high temperatures, as well as reduced complex modulus and increased phase angle at low temperatures. SBS modification also caused reductions in glass transition temperature, Fraass breaking point, and temperature susceptibility. The degree of improvement was observed to be influenced by bitumen source/grade and polymer content/structure. Comparison showed that certain relationships exist between parameters obtained using conventional methods and DMA, such as between penetration and complex modulus, kinematic viscosity and complex viscosity, and Fraass breaking point and glass transition temperature. However, the main conclusion of the study is that conventional test parameters such as penetration and softening point are not suitable for characterization of rheological properties of SBS modified bitumens.


    Author Information:

    Lu, X
    Division of Highway Engineering, Royal Institute of Technology, Stockholm, Sweden

    Isacsson, U
    Division of Highway Engineering, Royal Institute of Technology, Stockholm, Sweden


    Stock #: JTE11874J

    ISSN: 0090-3973

    DOI: 10.1520/JTE11874J

    ASTM International is a member of CrossRef.

    Author
    Title Characterization of Styrene-Butadiene-Styrene Polymer Modified Bitumens—Comparison of Conventional Methods and Dynamic Mechanical Analyses
    Symposium , 0000-00-00
    Committee D20