STP1108

    SBS-Modified Asphalts for Surface Dressing — A Comparison Between Hot-Applied and Emulsified Binders

    Published: Jan 1992


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    Abstract

    Styrene-butadiene-styrene addition improves the properties of asphalt in surface dressing: the thermal susceptibility is reduced and the binder cohesion increased, hence better resistance to bleeding and to aggregate dislodgement. The characteristics of hot-applied and emulsified SBS-modified binders are compared through series of laboratory tests: rheological properties, cohesion, tensile strength, toughness and tenacity. Application problems and field performance are globally examined. Hot-applied SBS-modified binders encounter viscosity and adhesion problems. They require a high amount of diluent, that may soften the support and cause aggregate embedment. Their SBS-content must be limited. Emulsified SBS-modified asphalts show excellent adhesion to all types of aggregate. They require very small amounts of diluent. High SBS contents can be employed. Their main drawback is slow setting time.

    Keywords:

    styrene-butadiene-styrene, asphalt modification, surface dressing, hot-applied, emulsified binders


    Author Information:

    Serfass, J-P
    technical manager and development managerhead of section, Screg RoutesRecherche-Technique-Entreprise,

    Joly, A
    technical manager and development managerhead of section, Screg RoutesRecherche-Technique-Entreprise,

    Samanos, J
    technical manager and development managerhead of section, Screg RoutesRecherche-Technique-Entreprise,


    Paper ID: STP17839S

    Committee/Subcommittee: D04.45

    DOI: 10.1520/STP17839S


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