Mesoscale fracture simulation of recycled aggregate concrete under uniaxial compression based on cohesive zone model

Autor: Chunqi Zhu, Eryu Zhu, Bin Wang, Zhu Zhang, Mingyang Li
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Developments in the Built Environment, Vol 19, Iss , Pp 100481- (2024)
Druh dokumentu: article
ISSN: 2666-1659
DOI: 10.1016/j.dibe.2024.100481
Popis: It is important to clarify the uniaxial compressive mechanical properties and fracture mechanism of recycled aggregate concrete (RAC) from a mesoscale perspective for its further application in engineering. In this study, the cohesive zone model (CZM) based on the Benzeggagh–Kenane (B–K) criterion was used to simulate the RAC's complex fracture behavior. Meanwhile, the effects of cohesive element parameters and mechanical properties of mesoscale components on macroscopic mechanical properties and damage modes of RAC were investigated. The results show that the CZM based on the B–K criterion can be used to characterize the whole fracture process of RAC. The RAC's compressive strength has an exponential relationship with the shear strengths of the mortars as well as the ITZs and is quadratically related to the logarithm of cohesive element stiffness. The RAC's damage morphology is more sensitive to the change of element stiffness, Mode II fracture energy and hybrid fracture energy ratio.
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