Prediction of dynamic modulus of asphalt mixture using micromechanical method with radial distribution functions

Jiupeng Zhang, Zepeng Fan, Hao Wang, Wei Sun, Jianzhong Pei, Dawei Wang

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Inter-particle interaction is one of the major reinforcement mechanisms for aggregates in asphalt mixture, which is a classic example of high-volume fraction particulate composites. This paper introduced the modified Ju-Chen (J-C) micromechanical method based on two types of radial distribution assumptions for inclusions in the matrix, namely the uniform distribution and Percus–Yevick (P–Y) distribution. A two-step approach was proposed and the elastic–viscoelastic correspondence principle was used to predict the effective dynamic modulus of asphalt mixture at different frequencies. The prediction results show that the uniform distribution and P–Y distribution based J-C method could generate the upper and lower bounds of dynamic modulus for asphalt mixture, respectively. As compared to the measured dynamic modulus at different temperatures and loading frequencies, the modified J-C method showed better prediction accuracy as compared to two traditional micromechanical models based on single inclusion configuration, Mori–Tanaka (M–T) and differential scheme effective medium models. The J-C method assuming P–Y distribution provided better accuracy at the low frequencies; while the J-C method assuming the uniform distribution only had good accuracy at the high frequencies. The study findings indicate that dynamic modulus of asphalt mixture can be predicted based on laboratory tests conducted at the fine aggregate mix level and the void ratio and the gradation of coarse aggregate using appropriate micromechanics methods.

Original languageEnglish (US)
Article number49
JournalMaterials and Structures/Materiaux et Constructions
Volume52
Issue number2
DOIs
StatePublished - Apr 1 2019

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials

Keywords

  • Asphalt mixture
  • Inter-particle effect
  • Micromechanical method
  • Radial distribution function
  • Two-step approach

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