01661632

Component

Warm mix asphalt (WMA) technology has been increasingly utilized in rubberized asphalt pavements to reduce the production and compaction temperatures and the incidental fumes and odors. This study aims to investigate the high and intermediate temperature performance of crumb rubber modified asphalt binders containing WMA additives. The asphalt-rubber interactions under various mixing combinations of temperature and time were investigated to obtain the optimum mixing procedure based on high-temperature performance. It was found that asphalt-rubber interaction is highly temperature and time dependent. With the increase of interaction temperature, swelling and degradation of rubber particles successively occurred in the asphalt matrix. The effects of WMA additives (wax-based and chemical-based products) on the high-temperature performance and fatigue performance of binders were investigated by multiple stress creep and recovery (MSCR) test and linear amplitude sweep (LAS) test respectively. Results show that rubberized asphalt binders exhibited superior high-temperature and fatigue performance than base asphalt. The effects of WMA additives on the high-temperature and fatigue performance varied with base asphalt and rubberized asphalt binder. In addition, the nonrecoverable compliance difference was found not suitable to characterize the stress sensitivity of rubberized binders and an alternate parameter Jnrslope was proposed and proved to characterize the stress sensitivity more accurately. For the cyclic LAS test, the failure energy was found to have a strong correlation with the predicted fatigue life using simplified viscoelastic continuum damage analysis and therefore can be considered as a simple indicator for binder fatigue performance ranking.

This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders. High- and Intermediate-Temperature Performance of Rubberized Asphalt Containing Nonfoaming Warm-Mix Additives: This is an alternate title.

18-02454

English

5p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Tables

Asphalt additives; Asphalt rubber; Crumb rubber; High temperature; Performance tests; Warm mix paving mixtures

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2018 Paper #18-02454

TRIS, TRB, ATRI

Jan 8 2018 10:35AM