Fracture Behavior and Numerical Simulation of Modelled Interfacial Transition Zone in Recycled Aggregate Concrete
WU Jun1, DING Yahong2,*, GUO Meng2, GUO Shuqi2
1 School of Civil Engineering and Architecture, Xinxiang University, Xinxiang 453003, Henan, China 2 School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
Abstract: The effects of water-cement ratio and carbonated aggregate on the fracture behavior of modelled interfacial transition zone (ITZ) in recycled aggregate concrete (RAC) were investigated using the three-point bending beam method, the prism specimenswere prepared with the size of 40 mm×40 mm×160 mm. Based on the cohesive zone model, the influence of crack height and interface strength on its fracture behavior was studied using a finite element software(ABAQUS). The results show that the load-displacement curve for fracture behavior of modelled ITZ consists of the ascending straight line segment, the ascending curve segment, and the descending curve segment. As the water-cement ratio increase from 0.40 to 0.50, the critical displacement and maximum load of modelled ITZ gradually decrease, while carbonated aggregate led to an increase in the maximum load by 64.40%, 37.26%, 32.02% respectively. As the crack height increases from 0 mm to 16 mm, the critical displacement of the load-displacement curve gradually increases, while the maximum load and unstable toughness gradually decrease, and the increase ratio of these three indices gradually decreases between adjacent crack heights and interface strengths. By contrast, as the interface strength increases from 0.6 MPa to 2.8 MPa, the changing trends of these three indices were opposite to those of the crack height increase.
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2025, Vol. 39 
