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Open AccessArticle

Numerical Studies on Damage Behavior of Recycled Aggregate Concrete Based on a 3D Model

Department of Architecture and Engineering, Yancheng Polytechnic College, Jiangsu 224005, China
Department of Architecture and Engineering, Beijing University of Technology, Beijing 100124, China
School of Civil Engineering, Nanjing Technology University, Nanjing 211816, China
Department of Civil Engineering, Faculty of Engineering, Fayoum University, Fayoum 63514, Egypt
Authors to whom correspondence should be addressed.
Materials 2020, 13(2), 355;
Received: 16 November 2019 / Revised: 8 January 2020 / Accepted: 9 January 2020 / Published: 12 January 2020
(This article belongs to the Special Issue Properties and Novel Applications of Recycled Aggregates)
This paper develops a 3D base force element method (BFEM) based on the potential energy principle. According to the BFEM, the stiffness matrix and node displacement of any eight-node hexahedral element are derived as a uniform expression. Moreover, this expression is explicitly expressed without a Gaussian integral. A 3D random numerical model of recycled aggregate concrete (RAC) is established. The randomness of aggregate was obtained by using the Monte Carlo random method. The effects of the recycled aggregate substitution and adhered mortar percentage on the elastic modulus and compressive strength are explored under uniaxial compression loading. In addition, the failure pattern is also studied. The obtained data show that the 3D BFEM is an efficient method to explore the failure mechanism of heterogeneous materials. The 3D random RAC model is feasible for characterizing the mesostructure of RAC. Both the substitution of recycled aggregate and the percentage of adhering mortar have a non-negligible influence on the mechanical properties of RAC. As the weak points in the specimen, the old interfacial transition zone (ITZ) and adhered mortar are the major factors that lead to the weakened properties of RAC. The first crack always appears in these weak zones, and then, due to the increase and transfer of stress, approximately two-to-three continuous cracks are formed in the 45°direction of the specimen. View Full-Text
Keywords: 3D BFEM; recycled aggregate concrete; numerical simulation; failure pattern 3D BFEM; recycled aggregate concrete; numerical simulation; failure pattern
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Wang, Y.; Zhao, H.; Xu, M.; Wu, C.; Fu, J.; Gao, L.; Kamel, M.M.A. Numerical Studies on Damage Behavior of Recycled Aggregate Concrete Based on a 3D Model. Materials 2020, 13, 355.

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