Abstract
Concrete made with large-size recycled aggregates is a new kind of recycled concrete, where the size of the recycled aggregate used is 25–80 mm, which is generally three times that of conventional aggregate. Thus, its composition and mechanical properties are different from that of conventional recycled concrete and can be applied in large-volume structures. In this study, recycled aggregate generated in two stages with randomly distributed gravels and mortar was used to replace the conventional recycled aggregate model, to observe the internal stress state and cracking of the large-size recycled aggregate. This paper also investigated the mechanical properties, such as the compressive strength, crack morphology, and stress–strain curve, of concrete with large-size recycled aggregates under different confining pressures and recycled aggregate incorporation ratios. Through this research, it was found that when compared with conventional concrete, under the confining pressure, the strength of large-size recycled aggregate concrete did not decrease significantly at the same stress state, moreover, the stiffness was increased. Confining pressure has a significant influence on the strength of large-size recycled aggregate cocrete.
Highlights
Does waste concrete take up much space, but it pollutes the environment.This trend has accelerated dramatically as the economy has grown
Ying et al [15] employed the three-dimensional base force element technique (BFEM) to simulate the uniaxial compression test of recycled concrete, and the results demonstrated that the method could accurately represent the nonlinear deformation of RAC
The cracks in the model eventually changed shape from a diagonal crack that penetrated two of the model’s opposing corners. This demonstrates square to athe diagonal crack that penetrated two of theratio model’s opposing corners. This that when recycled coarse aggregate incorporation is large, the failure mechanism demonstrates that when the recycled coarse aggregate incorporation ratio is large, the of recycled concrete is similar to that of uniaxial compression
Summary
Does waste concrete take up much space, but it pollutes the environment. Recent versions of the discrete element technique employ deformable blocks to overcome high joint displacements and modest block deformations [10,11,12,13] He et al [14] conducted biaxial compression experiments on recycled concrete at various strain rates and discovered that while the strength of RAC rose as the strain rate increased, the concrete’s failure mode remained the same. Li et al [19] examined the finite element approach with the discrete element method for simulating large-size recycled aggregate concrete and found that the discrete element method produces more realistic results at a larger recycled aggregate inclusion ratio This technique has been frequently applied to the stress cracking of rock materials, with excellent results. This article looked at the compressive strength, crack morphology, and stress–strain curve of concrete using large-size recycled aggregate under various confining pressures and recycled aggregate incorporation percentages
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