Evaluation of the master curves for complex shear modulus for nano-modified asphalt binders

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Conference Proceeding

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The objective of this study is to develop an improved master curve for complex shear modulus (|G*|) of asphalt binder modified by nanomaterials. In this study, five different kinds of nanomaterials-non-polymer modified nanoclay (NPMN), polymer modified nanoclay (PMN), micro-carbon fiber (MCF), nanomer I.44P (NI.44P) and nanosilica (NS)-were selected. Each of the nanomaterials was added to the control asphalt at concentrations of 2% and 4% by the weight of control asphalt binder. According to the SuperpaveTM specification, the nano-modified asphalt binders were tested with a dynamic shear rheometer (DSR) and the complex shear modulus was obtained. The traditional sigmoidal master curve was revised in this study and an improved master curse model was proposed for nano-modified asphalt binder with the implementation of the effect from phase angle. The traditional and proposed master curves were then compared using 700 data points tested in this study. It was found out that the proposed improved master curve was better in terms of best fit of the predicted |G*| and measured |G*|. © 2012 American Society of Civil Engineering.

Publication Title

CICTP 2012: Multimodal Transportation Systems - Convenient, Safe, Cost-Effective, Efficient - Proceedings of the 12th COTA International Conference of Transportation Professionals