Shear transfer across a crack in recycled aggregate concrete

Xiao, Jianzhuang; Xie, He; Yang, Zhenjun

doi:10.1016/j.cemconres.2012.02.006

Cited by 87 publications

(32 citation statements)

References 7 publications

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“…The average of the measured cylinder strengths of the normal‐, and medium‐strength concretes are presented in Table and trends in the compressive strengths as a function of the RCA replacement level are shown with the help of interpolation lines in Figure a. Trends in Figure a are in agreement with findings reported in the literature . Figure a shows that compressive strength decreased by 21% as the RCA replacement level increased from 0% to 100% in the normal‐strength concrete and the corresponding figure for the medium‐strength concrete was 9.7%.…”

Section: Effect Of Rca Replacement Levelsupporting

confidence: 85%

“…Relatively few investigations have been carried out on shear friction in RAC. Xiao et al reported similar shear‐transfer behavior between their natural aggregate concrete (NAC) and RAC pre‐cracked push‐off specimens. The predicted shear strengths, using the ACI 318 and the PCI code design equations, were found to have varying degrees of conservatism.…”

Section: Introductionmentioning

confidence: 87%

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An experimental study on shear capacity of interfaces in recycled aggregate concrete

Waseem

Singh

2018

Structural Concrete

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Forty-eight initially uncracked push-off specimens were used for the investigation of the interface shear strength of natural and recycled coarse aggregate concrete. The parameters varied in the push-off tests were the recycled aggregate replacement level (0, 50, and 100%), the clamping force across the shear-transfer plane and the concrete grade (normal-and medium-strength). The inclined cracks crossing the shear plane, noted before the development of shear cracks, were indicative of the truss like action for resisting shear in push-off specimens. An analytical approach based on the truss modeling of the force system within the push-off specimens using the method initially proposed by Mattock and Hawkins has been used for prediction of interface cracking stress of both the concrete types. Calibration of the proposed analytical procedure has been done with the help of the experimental results of the tested push-off specimens. Using the experimental results as well as comparable results from the literature, a shear-friction regression equation accounting for the effect of concrete grade, normal force on the shear plane and the recycled coarse aggregate replacement level has been proposed for shear strength. K E Y W O R D S push-off specimen, recycled aggregate concrete, shear plane, shear strength, truss-based analysis 1 | INTRODUCTIONIn many cases, shear failure is constrained to occur across interfaces that can slide relative to each other. This type of behavior is usually associated with shear-critical elements as corbels, bearing shoes, pre-cast assemblies, etc. having highly distressed shear interfaces. 1,2 Over the years, several different types of test specimens have been used to investigate interface shear capacities with the underlying objective in the specimen design being the ability to induce a relative sliding action in the specimen under the action of a load parallel to the plane of sliding, the most common being the so-called push-off specimens (Figure 1). Based on the tests carried out on push-off specimens, either uncracked or precracked prior to testing, several design expressions have been proposed to predict the shear capacity of concrete-toconcrete interfaces. 3-9 A majority of these expressions assign shear strength either to a combination of "cohesion and friction" or "cohesion" of the interface is entirely ignored and it is assumed that shear transfer is completely due to friction. Since the "cohesion" of the interface is ignored in the shear-friction model, the use of unusually high values of the coefficient of friction is required so as to fit the test data. It may be noted that the shear-friction model is the basis for the current design practice for reinforced concrete under shear stresses.Discounting the shear-friction theory, Hsu et al 10 proposed a shear-transfer theory based on truss models wherein the shear strength is controlled by the crushing strength of

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Section: Effect Of Rca Replacement Levelsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 87%

An experimental study on shear capacity of interfaces in recycled aggregate concrete

Waseem

Singh

2018

Structural Concrete

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“…Generally, curves with different stirrups numbers show similar trends. Xiao et al has also found that the lateral constraint positively affect the shear transfer strength of precracked RAC push‐off specimens.…”

Section: Parametric Study and Discussionmentioning

confidence: 96%

Simulation study on the shear transfer behavior of recycled aggregate concrete

Sun

Xiao

Lange

2017

Structural Concrete

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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...

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“…It has been found that, although most of the mechanical properties of RAC are slightly lower than those of the natural aggregate concrete (NAC), they may be still sufficient for practical applications in civil engineering. This is further confirmed by recent experimental studies of the mechanical behavior of structural components made of RAC, for example, the shear (Han et al ., ; Etxeberria et al ., ; Fathifazl et al ., ) and flexural performance (Fathifazl et al ., ; Xiao et al ., ) of beams, the shear performance of push‐off specimens (Xiao et al ., ) and the bearing capacity and deformability of beams and columns (Ajdukiewicz and Kliszczewicz, ).…”

Section: Introductionmentioning

confidence: 97%

Nonlinear analysis and test validation on seismic performance of a recycled aggregate concrete space frame

Xiao

Wang

Pham

et al. 2014

Structural Design Tall Build

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SUMMARY Three‐dimensional recycled aggregate concrete (RAC) nonlinear finite element models are developed by OpenSees software to investigate the seismic responses of a 1/4‐scaled six‐story, two‐bay and two‐span RAC space frame, which has been tested on a shaking table subjected to various earthquake scenarios. The simulated natural frequencies and vibration modal shapes, the acceleration amplification factors, the maximum story displacements and the inter‐story drifts are carefully validated by and compared with the test data with overall good agreement. The simulated seismic responses of the RAC frame and the natural aggregate concrete (NAC) frame are also compared. The aseismic capacity of the NAC frame structure is better than that of the RAC frame structure in the early stage, and they behave almost the same in the severe stage under strong earthquake excitations. Both tested and simulated results indicate that not only the peak ground acceleration and duration and frequency of ground motion but also concrete material properties play a prominent role in the overall seismic performances of frame structures. Copyright © 2014 John Wiley & Sons, Ltd.

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Shear transfer across a crack in recycled aggregate concrete

Cited by 87 publications

References 7 publications

An experimental study on shear capacity of interfaces in recycled aggregate concrete

An experimental study on shear capacity of interfaces in recycled aggregate concrete

Simulation study on the shear transfer behavior of recycled aggregate concrete

Nonlinear analysis and test validation on seismic performance of a recycled aggregate concrete space frame

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