Behavior of Selected Warm Mix Asphalt Additive Modified Binders and Prediction of Dynamic Modulus of the Mixes

Volume 41, Issue 1 (January 2013)

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ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 11 December 2012
Page Count: 12

Behavior of Selected Warm Mix Asphalt Additive Modified Binders and Prediction of Dynamic Modulus of the Mixes

Hossain, Zahid
Research Associate, School of Civil Engineering and Environmental Science, The Univ. of Oklahoma, Norman, OK

Zaman, Musharraf
David Ross Boyd Professor and Aaron Alexander Professor, School of Civil Engineering and Environmental Science; and Associate Dean for Research and Graduate Programs, College of Engineering, Norman, OK

(Received 25 December 2011; accepted 15 May 2012)

Abstract

This study evaluated the viscoelastic properties of a performance grade binder modified with different dosages of a selected wax-based warm mix asphalt (WMA) additive (WMA1). The effects of reduced rolling thin film oven (RTFO) aging on the stiffness of the WMA1-modified binder were also evaluated. The viscoelastic properties of the modified binders were then used to estimate the dynamic modulus (E*) values of the WMA mixes through time temperature superposition principles. Furthermore, the effects of a selected liquid anti-stripping agent (ASA), ASA1, on the properties of the WMA1-modified binder were investigated. It was observed that the linear viscoelastic limits of WMA1-modified binders decreased with an increasing dosage of WMA1. Reduced RTFO aging was found to have significant effects on the stiffness of the WMA1-modified binder. The Hirsch model was found to provide better approximations of the E* values than the Witczak model. The Witczak model, based on dynamic shear rheometer data, was found to significantly underestimate the E* values. Although ASA1 did not reduce the beneficial effects of WMA1, it was found to increase the E* values of the WMA mix. The findings of this study are expected to offer transportation professionals a better understanding of the evaluation of WMA binders and mixes.

Keywords:
MEPDG, dynamic modulus, viscoelastic properties, warm mix asphalt, stripping

Paper ID: JTE104639
DOI: 10.1520/JTE104639
ASTM International is a member of CrossRef.

Author Title Behavior of Selected Warm Mix Asphalt Additive Modified Binders and Prediction of Dynamic Modulus of the Mixes Symposium , 0000-00-00 Committee D04

		SEDL / Journals / Journal of Testing and Evaluation (JTE) / Citation Page Volume 41, Issue 1 (January 2013) Click here to download this paper now for $25 PDF (1.2M) View License Agreement ISSN: 1945-7553 CODEN: JTEVAB Published Online: 11 December 2012 Page Count: 12 Behavior of Selected Warm Mix Asphalt Additive Modified Binders and Prediction of Dynamic Modulus of the Mixes Hossain, Zahid Research Associate, School of Civil Engineering and Environmental Science, The Univ. of Oklahoma, Norman, OK Zaman, Musharraf David Ross Boyd Professor and Aaron Alexander Professor, School of Civil Engineering and Environmental Science; and Associate Dean for Research and Graduate Programs, College of Engineering, Norman, OK (Received 25 December 2011; accepted 15 May 2012) Abstract This study evaluated the viscoelastic properties of a performance grade binder modified with different dosages of a selected wax-based warm mix asphalt (WMA) additive (WMA1). The effects of reduced rolling thin film oven (RTFO) aging on the stiffness of the WMA1-modified binder were also evaluated. The viscoelastic properties of the modified binders were then used to estimate the dynamic modulus (E) values of the WMA mixes through time temperature superposition principles. Furthermore, the effects of a selected liquid anti-stripping agent (ASA), ASA1, on the properties of the WMA1-modified binder were investigated. It was observed that the linear viscoelastic limits of WMA1-modified binders decreased with an increasing dosage of WMA1. Reduced RTFO aging was found to have significant effects on the stiffness of the WMA1-modified binder. The Hirsch model was found to provide better approximations of the E values than the Witczak model. The Witczak model, based on dynamic shear rheometer data, was found to significantly underestimate the E* values. Although ASA1 did not reduce the beneficial effects of WMA1, it was found to increase the E* values of the WMA mix. The findings of this study are expected to offer transportation professionals a better understanding of the evaluation of WMA binders and mixes. Keywords: MEPDG, dynamic modulus, viscoelastic properties, warm mix asphalt, stripping Paper ID: JTE104639 DOI: 10.1520/JTE104639 ASTM International is a member of CrossRef. Author Title Behavior of Selected Warm Mix Asphalt Additive Modified Binders and Prediction of Dynamic Modulus of the Mixes Symposium , 0000-00-00 Committee D04