Analysis of the Low-Temperature Rheological Properties of Rubberized Warm Mix Asphalt Binders

    Volume 40, Issue 7 (December 2012)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Published Online: 26 November 2012

    Page Count: 11


    Wang, Hainian
    Highway School, Chang’an Univ., Xi’an, Shanxi

    Dang, Zhengxia
    Highway School, Chang’an Univ., Xi’an, Shanxi

    You, Zhanping
    Dept. of Civil and Environmental Engineering, Michigan Technological Univ., Houghton, Michigan

    Hao, Peiwen
    Highway School, Chang’an Univ., Xi’an, Shanxi

    Huang, Xiaoming
    Transportation School, Southeast Univ., Nanjing, Jiangshu

    (Received 8 May 2012; accepted 26 June 2012)

    Abstract

    Warm mix asphalt (WMA) has generated a lot of interest worldwide based on the potential to realize environmental benefits related to lower production temperature and safe disposal of crumb rubber (tires). However, barriers to complete implementation of WMA technology still exist because of the lack of understanding of how different additives affect the performance of crumb rubber modified (CRM) binders. This paper investigates the effects of three WMA additives and crumb rubber concentration on the low-temperature performance of the CRM binders. The WMA additives used in this study were Sasobit, RH, and Advera, and the ambient 40 mesh tire rubber at different concentrations of 10 %, 15 %, 20 %, and 25 % by the weight of asphalt binder were applied in this paper. Burgers model was used to describe the relationship between deformation and time for rubberized WMA binder. The models parameters such as relaxation time, delay time, creep stiffness, m-value and m/S(t)-ratio were applied to evaluate the low-temperature performance of the rubberized WMA binders. Furthermore, the statistical analysis of variance (ANOVA) technique was applied to quantify the effects of different WMA additives and crumb rubber concentrations on the rubberized asphalt binders’ low-temperature performance. It was found that Advera could be used to enhance the low-temperature performance by enhancing the stress relaxation, whereas RH and Sasobit did not exhibit this ability, thereby weakening the low-temperature performance of the CRM binders. The crumb rubber concentration could significantly increase the rubberized WMA binders’ low-temperature performance by influencing the flexural creep stiffness of the control binders.


    Paper ID: JTE20120147

    DOI: 10.1520/JTE20120147

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    Author
    Title Analysis of the Low-Temperature Rheological Properties of Rubberized Warm Mix Asphalt Binders
    Symposium , 0000-00-00
    Committee D04