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Meso- to Macroscale Homogenisation of Hot Mix Asphalt Considering Viscoelasticity and the Critical Role of Mortar

  • Johannes NeumannEmail author
  • Jaan-Willem Simon
  • Stefanie Reese
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 20)

Abstract

Computational homogenisation is a useful tool to predict the macroscale response of composite materials without the cumbersome experimental programme. However, careful verification is required for computational methods as well. A recently proposed method to create synthetic 3D mesoscale models of hot mix asphalt uses Voronoi polyhedra to represent the mineral aggregate. The agreement of these synthetic shapes with data from XRCT scanning is investigated. Typical shape measures are compared, and good agreement is found. The generalised Maxwell model is used to describe the viscoelasticity of the mortar. However, the previously used experimental data is found to be inadequate. This is attributed to the hitherto employed mortar design, which is revised, and a review of the relevant literature is conducted. Reported experimental data is critically assessed in terms of usefulness for homogenisation schemes. First-order strain driven homogenisation is then carried out in frequency domain in order to obtain the macroscale response, which is compared to macroscale experimental data. A satisfactory agreement is found.

Keywords

Hot mix asphalt Computational homogenisation Mortar 

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Copyright information

© RILEM 2019

Authors and Affiliations

  • Johannes Neumann
    • 1
    Email author
  • Jaan-Willem Simon
    • 2
  • Stefanie Reese
    • 2
  1. 1.Aachen Association of Highway Engineering GmbHAachenGermany
  2. 2.Institute of Applied MechanicsRWTH Aachen UniversityAachenGermany

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