ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 26 November 2012
Page Count: 11

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

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.

Keywords:
rubberized warm mix asphalt binder, Burgers model, relaxation time, delay time, creep stiffness, m-value, low-temperature property

Paper ID: JTE20120147
DOI: 10.1520/JTE20120147
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