Visualization of the three-dimensional structure and stress field of aggregated concrete materials through 3D printing and frozen-stress techniques

摘要: Abstract Characterization of the three-dimensional stress field concrete materials is crucial to understanding their mechanical properties and failure mechanisms, but hidden complex meso-scale structure makes physically extracting visualizing this information intractable. This paper therefore presents a new approach that uses 3D printed models based on X-ray microfocus computed tomography (CT) imaging sample replicate its aggregate in transparent matrix. The associated visually characterized at mesoscale through uniaxial compression tests photoelastic techniques incorporate frozen-stress test analyse effects randomly distributed aggregates. These results are used validate accuracy simulated data created using finite element method, which allows comparison be made between two-dimensional heterogeneous aggregated models. study indicates meso-heterogeneity has more influence state localized areas than entire field. Compared 2D structures, structures possess lower concentration due lateral inertial confinement effect. difference two types attributable combination structural heterogeneity confinement.