Flexural behaviour of recycled aggregate concrete graded slabs

Xiao, Jianzhuang; Sun, Chang; Jiang, Xinghan

doi:10.1002/suco.201400008

Cited by 23 publications

(16 citation statements)

References 8 publications

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“…2The concrete strength has only minor influence on the load-bearing capacity of flexural members, which are not subjected to axial forces. In literature, there are few studies on slabs incorporating RCA [31][32][33][34][35][36]. Among these studies, research on flexural behavior of slabs is scarce [35][36] and do not cover the tests of members constructed using RCA sourced from low strength concrete.…”

Section: Full-scale Tests On Rc Slabs and Columnsmentioning

confidence: 99%

“…In literature, there are few studies on slabs incorporating RCA [31][32][33][34][35][36]. Among these studies, research on flexural behavior of slabs is scarce [35][36] and do not cover the tests of members constructed using RCA sourced from low strength concrete. On the other hand, although there are numerous studies related to utilization of RCA in new concrete applications, little information has been reported on the seismic performance of RC columns constructed of recycled aggregate concrete (RAC) [23][24][25][26].…”

Section: Full-scale Tests On Rc Slabs and Columnsmentioning

confidence: 99%

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Seismic Behavior of Reinforced Concrete Members Built with Recycled Aggregate

İlki¹,

Saribas²,

Göksu³

2019

acperpro

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In connection with rapid urbanization and earthquakes, a huge number of structures have been demolished and generated lots of waste concrete for the last 40 years. Studies on the reclamation of the waste concrete is a pioneer subject for construction sectors in the world. Since the recycling of the waste concrete and reusing of recycled concrete aggregate in the production of new concrete is an important issue for saving of natural resources, economic, sustainable development, significant number of studies have been carried out on this subject. In the scope of this study, a literature review is conducted on the effect of recycled concrete aggregate on mechanical and durability characteristics of small-scale members. Furthermore, structural and seismic performances of full-scale reinforced concrete structural members produced with recycled concrete aggregate are discussed. The test results indicated that the structural members containing recycled aggregate exhibited similar structural performance with their counterparts containing natural aggregates. It was also observed that recycled concrete aggregate did not seem to have an adverse effect on seismic characteristics of the structural members such as ductility.

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Section: Full-scale Tests On Rc Slabs and Columnsmentioning

confidence: 99%

Section: Full-scale Tests On Rc Slabs and Columnsmentioning

confidence: 99%

Seismic Behavior of Reinforced Concrete Members Built with Recycled Aggregate

İlki¹,

Saribas²,

Göksu³

2019

acperpro

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“…FGMs can be defined as materials whose composition, structure or properties change over any direction [13]. Within this topic, Xiao [14] used RAC and NAC to produce functionally graded concrete (FGC) and conducted ultimate load testing of one-way slabs produced with layers of RAC (with 50% and 100% of coarse RCA) and NAC, distributed in three horizontal layers. The results showed that the layered RAC slabs had a similar or even improved ultimate flexural behavior when compared to the homogeneous RAC slabs.…”

Section: Introductionmentioning

confidence: 99%

Improved Serviceability and Environmental Performance of One-Way Slabs through the Use of Layered Natural and Recycled Aggregate Concrete

2020

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Recycled aggregate concrete (RAC), i.e., concrete produced with recycled concrete aggregate (RCA) has been heavily investigated recently, and the structural design of RAC is entering into design codes. Nonetheless, the service load deflection behavior of RAC remains a challenge due to its larger shrinkage and creep, and lower modulus of elasticity. A novel solution to this challenge is the use of layered concrete, i.e., casting of horizontal layers of different concretes. To investigate the potential benefits and limits of layered concrete, this study contains a numerical parametric assessment of the time-dependent sustained service load deflections and environmental impacts of homogeneous and layered NAC and RAC one-way slabs. Four types of reinforced concrete slabs were considered: homogeneous slabs with 0%, 50% and 100% of coarse RCA (NAC, RAC50 and RAC100, respectively) and layered L-RAC100 slabs with the bottom and top halves consisting of RAC100 and NAC, respectively. In the deflection study, different statical systems, concrete strength classes and relative humidity conditions were investigated. The results showed that the layered L-RAC100 slabs performed as well as, or even better than, the NAC slabs due to the differential shrinkage between the layers. In terms of environmental performance, evaluated using a “cradle-to-gate” Life Cycle Assessment approach, the L-RAC100 slabs also performed as well as, or slightly better than, the NAC slabs. Therefore, layered NAC and RAC slabs can be a potentially advantageous solution from both structural and environmental perspectives.

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“…The mechanical behavior of the interface was assumed as a plasticity model with a Mohr‐Coulomb friction law yield surface. Xiao et al studied the flexural behavior of RAC graded slabs with a three‐dimensional (3D) FEM model. Based on compression tests of concrete cube, different constitutive relations were used for different concrete layers.…”

Section: Introductionmentioning

confidence: 99%

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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Flexural behaviour of recycled aggregate concrete graded slabs

Cited by 23 publications

References 8 publications

Seismic Behavior of Reinforced Concrete Members Built with Recycled Aggregate

Seismic Behavior of Reinforced Concrete Members Built with Recycled Aggregate

Improved Serviceability and Environmental Performance of One-Way Slabs through the Use of Layered Natural and Recycled Aggregate Concrete

Simulation study on the shear transfer behavior of recycled aggregate concrete

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