Volume 42, Issue 4 (July 2014)

    Low Temperature Tensile Characteristics of Warm-Mix Asphalt Mixtures

    (Received 27 December 2012; accepted 18 November 2013)

    Published Online: 2014

    CODEN: JTEOAD

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    Abstract

    The tensile strength (St) of warm-mix asphalt (WMA) and hot-mix asphalt (HMA) concretes were measured by indirect tensile strength test at 25, 5, −5, −15, −25 and −35°C. Fracture toughness (Tu) was calculated from each of the St test curves. Two WMA additives and two polymer modifiers were used to produce WMA mixtures at 135°C in the laboratory. All asphalt concretes evaluated in this study showed St increase by temperature decreases, peaking at −15°C or −25°C, then decreasing with further lowering of temperatures. The St values of WMA mixtures were observed to be higher than those of HMA mixtures in most cases at all low temperatures evaluated in this study. After being subjected to differential thermal contraction damage at −15 and/or −20°C, most of the WMA mixtures showed higher St than HMA mixes at severely low temperatures (−25 and −35°C). Therefore, it was concluded that the WMA mixtures had stronger St than HMA mixtures at low temperatures when prepared with the same low-temperature PG binders, even though they were produced at a lower aggregate-heating temperature.


    Author Information:

    Yeon, Kyu-Seok
    Professor, Department of Regional Infrastructures Engineering, Kangwon National Univ., Chuncheon,

    Kim, Sungun
    Lecturer, Department of Regional Infrastructures Engineering, Kangwon National Univ., Chuncheon,

    Lee, Hyong-Jong
    Researcher, Institute for Advanced Construction Materials, Kangwon National Univ., Chuncheon,

    Kim, Kwang W.
    Professor, Department of Regional Infrastructures Engineering, Kangwon National Univ., Chuncheon,


    Stock #: JTE20120364

    ISSN: 0090-3973

    DOI: 10.1520/JTE20120364

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    Author
    Title Low Temperature Tensile Characteristics of Warm-Mix Asphalt Mixtures
    Symposium , 0000-00-00
    Committee D04