Evaluation of high RAP-WMA asphalt rubber mixtures

Document Type

Conference Proceeding

Publication Date

1-1-2013

Abstract

The stiffness, fatigue cracking, reflective cracking, rutting, moisture damage, and workability of asphalt rubber surface mixtures with Reclaimed Asphalt Pavement (RAP) contents ≤ 40% with and without a warm mix asphalt (WMA) technology were studied. The addition of RAP had an adverse effect on the resistance to fatigue and reflective cracking of the mixtures. The resistance to fatigue cracking of the mixtures decreased with the incorporation of higher amounts of RAP. The same trend was also apparent with the incorporation of a WMA technology to the RAP mixtures. Control mixtures without RAP generally exhibited better fracture resistance than similar mixture containing RAP. Mixtures containing RAP exhibited higher critical strain energy values than similar mixtures that used WMA technology. Mixtures incorporating 25 and 40% RAP were more susceptible to reflective cracking as compared to the control mixtures. For the RAP mixtures, the addition of the WMA technology did not yield a better reflective cracking resistance. This is an abstract of a paper presented at the 88th AAPT Annual Meeting and Technical Sessions (Denver, CO 4/7-10/2013).

Publication Source (Journal or Book title)

Asphalt Paving Technology, AAPT

First Page

253

Last Page

287

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