A novel framework for realistic modelling of 3D
mesostructure and fracture behaviour of recycled aggregate concrete
Y. Ding, S. Naderi, G. van der Heijden & M. Zhang
Recycled aggregate concrete (RAC) offers a sustainable alternative to natural
aggregate concrete, while its meso-scale modelling is often limited by overly
simplified geometries. This study presents a novel 3D computational framework
using Voronoi tessellation and hierarchical clustering to realistically
generate 3D mesostructure of RAC. The model equips six distinct phases
including old aggregate, old mortar, new mortar, two interfacial transition
zones (ITZs) and voids, and employs splining and scaling techniques to
control morphology. It produces irregular recycled aggregates with realistic
size distribution, volume fraction, old mortar content, and shape descriptors
in terms of sphericity, roundness and convexity. Validation indicates
consistence with experimental findings in terms of geometry and composition.
3D meso-scale modelling of fracture processes in RAC under uniaxial
compression can accurately capture the crack initiation at old ITZs and
shear-dominated failure. The proposed modelling framework offers a robust
tool for understanding the mesostructure-mechanical property relationships
in RAC and optimising material design of RAC.
keywords: recycled aggregate concrete, irregular aggregate, mesostructure,
3D Voronoi tessellation, cohesive zone model
Cement and Concrete Composites 166, 106396 (2026)