Simulation study on the shear transfer behavior of recycled aggregate concrete

Abstract

In this paper, a three-dimensional finite element method (FEM) model of push-off tests for specimens made with recycled aggregate concrete (RAC) was presented. The FEM model used ABAQUS/Standard module software. The model considered the plasticity of concrete and the concrete-to-concrete contact properties, and was found to agree with experimental data from shear transfer tests. The verified model was then used for a parametric study that investigated lateral reinforcement, concrete strength, and recycled coarse aggregate (RCA) replacement ratio. The parametric study shows that the ultimate shear strength increases by 23.1% when the lateral reinforcement ratio increases from 0.56% to 1.12%; the ultimate shear stress increases almost linearly when the concrete strength increases from 30 MPa to 60 MPa; the ultimate shear stress is reduced by 13.8% when the RCA replacement ratio increases from 0% to 100%.finite element method (FEM), push-off specimens, recycled aggregate concrete (RAC), recycled coarse aggregate (RCA) replacement ratio, shear transfer behaviorRecycled aggregate concrete (RAC) is an emerging sustainable and "green" solution for resource and environment problems. 1 RAC uses crushed waste concrete to replace part or all of the natural aggregate. Many investigations have been carried out on the basic properties of RAC, such as mixture design, basic mechanical behavior, and long-term behavior. [2][3][4][5][6] Previous research on the mechanical properties of RAC have shown that, for the concrete with the same water to cement ratio, the compressive strength, tensile strength, and elastic modulus of RAC decrease with the increase of recycled coarse aggregate (RCA) replacement ratios. [7][8][9][10] Shear transfer behavior contributes significantly to the shear resistance design in concrete structures, such as shear walls, deep beams, and construction joints. Several studies on the behavior of concrete-to-concrete interface have been performed. Hofbeck et al 11 conducted an experimental study to investigate the influence of concrete strength, dowel action and lateral constraint stiffness on the shear transfer performance of conventional concrete. Crane 12 tested shear transfer behavior of ultra-high performance concrete and presented a new equation for the calculation of shear capacity of UHPC girders. Emiko 13 performed research on the shear transfer in lightweight aggregate concrete and foam concrete by testing 14 series of precracked push-off specimens. Gonzalez Fonteboa et al 14 conducted experiments on shear transfer performance of conventional concrete and RAC with silica fume. Xiao et al 15 carried out tests on high-strength concrete to study the temperature effect on the shear transfer capacity. Some other parameters, such as initial crack width, aggregate size, and joint surface condition, are among the factors that influence the interface shear strength. [16][17][18][19] Since 1970, increasing use of computer-based methods for design and simulation have led to a better understanding of the behavior...

Mesomechanical properties of concrete with different shapes and replacement ratios of recycled aggregate based on base force element method

“…The results showed that the compressive strength and tensile strength of RAC are generally lower than that of NC, and the cracks first appeared in the old ITZ, then the new ITZ, and finally passed through the CM form several continuous cracks. Sun et al presented a modeled RAC which considered the plasticity of concrete and the concrete‐to‐concrete contact properties to research the shear transfer properties. The results showed that the ultimate shear stress almost increases linearly when the concrete's strength increases from 30 to 60 MPa, and the ultimate shear stress is reduced by 13.8% when the replacement ratio of recycled aggregate increases from 0 to 100%.…”

Mesoscale fracture analysis of recycled aggregate concrete based on digital image processing technique

“…Despite that, the simulation research studies are having modest attention comparing to the experimental work. Finite element method (FEM) is counted as a very common track for concrete simulation 20–22 . Also, FEM was used to obtain heterogeneous media elastic properties, such as RAC 23,24 .…”

Shear transfer behavior between substrate recycled aggregate concrete and new natural aggregate concrete

“…Subsequently, a finite element analysis model was also established and verified based on their experimental results. 20 Rahal and Al-Khaleefi 21 found that 50% replacement of natural coarse aggregate (NCA) with RCA caused a significant decrease of the ultimate shear strength across the sheartransfer plane while full replacement of NCA with RCA had little adverse effects on that. Calculations from ACI 318-14 13 were conservative for all conditions.…”

“…Except for the study of Ceia et al, 22 there is a lack of information on the shear transfer behavior between RAC-to-NAC layers. Besides, existing studies [17][18]20,[23][24] on the shear strength between concrete interfaces focused on the condition of concrete placed monolithically and did not pay attention on the condition of concrete placed against hardened concrete. This paper aimed to fill this gap and investigate the shear transfer behavior between substrate RAC to new NAC by 72 push-off tests, considering the effects of concrete grade, replacement ratios of RCA, and lateral reinforcements ratios.…”