Abstract
The base force element method (BFEM) on potential energy principle is used to analyze recycled aggregate concrete (RAC) on mesolevel. The model of BFEM with triangular element is derived. The recycled aggregate concrete is taken as five-phase composites consisting of natural coarse aggregate, new mortar, new interfacial transition zone (ITZ), old mortar, and old ITZ on meso-level. The random aggregate model is used to simulate the mesostructure of recycled aggregate concrete. The mechanics properties of uniaxial compression and tension tests for RAC are simulated using the BFEM, respectively. The simulation results agree with the test results. This research method is a new way for investigating fracture mechanism and numerical simulation of mechanics properties for recycled aggregate concrete.
Highlights
The base force element method (BFEM) on potential energy principle is used to analyze recycled aggregate concrete (RAC) on mesolevel
The recycled aggregate concrete is taken as five-phase composites consisting of natural coarse aggregate, new mortar, new interfacial transition zone (ITZ), old mortar, and old interfacial transition zone (old ITZ) on meso-level
This research method is a new way for investigating fracture mechanism and numerical simulation of mechanics properties for recycled aggregate concrete
Summary
“Concrete” is considered as heterogeneous composites whose mechanical performance is much related to the microstructure of material. Peng et al [5] adopted the random aggregate model to simulate the mechanics properties of rolled compacted concrete on meso-level using FEM. “Recycled aggregate concrete” which is used as a green building material has attracted more and more researchers with the shortage of resources and an increasing number of construction wastes They have carried out a series of experiments and some conclusions have been obtained. Numerical simulation on stress-strain curve of recycled aggregate concrete was made by Xiao et al [8] with lattice model under uniaxial compression. A method on mesomechanics analysis was proposed by Peng et al [9, 16] and Zhou et al [10] using FEM for recycled aggregate concrete based on random aggregate model. This research method is a new way for investigating fracture mechanism and numerical simulation of mechanics properties of recycled aggregate concrete
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