Dynamic shear modulus prediction of asphalt mastic based on micromechanics

Document Type

Conference Proceeding

Publication Date

2-6-2018

Department

Department of Civil, Environmental, and Geospatial Engineering

Abstract

Asphalt mastic is treated as a two-phase composite with asphalt matrix and embedded-matrix coated mineral filler. A micromechanical model was established to predict the dynamic shear modulus of asphalt mastic, as used the generalized Maxwell model and elastic-viscoelastic correspondence principle, based on the simplified Christensen-Lo model solutions. The DSR tests for asphalt mastic were conducted to verify the proposed model, and the model parameters affecting the predicted moduli were also discussed using the derived predictive model. The results showed that the predicted modulus exhibited a acceptable precision for asphalt mastic with 10% filler volumes fractions, as compared to the measured ones; however, the predicted moduli indicated a decrease at 20% and 30% volumes fractions of fillers, the discrepancy mainly resulted from the interaction between filler particles with higher percentage, the percolation theory was then introduced to develop a newly modified model, the predicted moduli obtained by the modified model agreed well with the measured ones, the elastic modulus of fillers showed a slight effect on the predicted moduli, and the increased volumes fractions of fillers lead to the increased predicted moduli.

Publication Title

Transportation Research Congress 2016: Innovations in Transportation Research Infrastructure - Proceedings of the Transportation Research Congress 2016

ISBN

9780784481240

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