Influence of the amount of recycled coarse aggregate in concrete design and durability properties

Kwan, Wai Hoe; Ramli, Mahyuddin; Kam, Kenn Jhun; Sulieman, Mohd Zailan

doi:10.1016/j.conbuildmat.2011.06.059

Cited by 171 publications

(156 citation statements)

References 12 publications

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“…This finding was consistent to that of Kwan et al (2012) [2] who reported that RCA influences concrete design and durability. This trend was not observed by Lotfy and Al-Fayez, (2015) [13] when they used high-quality RCA produced on a commercial scale.…”

Section: Compressive Strengthsupporting

confidence: 82%

“…The inverse trend between the RCA content and compressive strength was probably due to the poor quality of the adhered mortar, which underwent crushing process, that weakened the ITZ in the concrete. The presence of adhered residual cement mortar on the RCA surface was in accordance to porous, rough [2] and weak interfacial bond strengths between the aggregate and the presence of micro cracks and fissures, which could decrease the bonding with the surrounding matrix [5]. Therefore, by giving ultimate load to the concrete, the weak sections would have greater probability to be interconnected between each other as the RCA content increases.…”

Section: Compressive Strengthmentioning

confidence: 96%

“…6 (c), (d)). The ITZ consists of less unhydrated particle and greater concentration of Ca(OH) 2 and ettringite. The microstructure of the specimen also shows that the ITZ of RCA was granular in nature and composed of small pores, micro cracks and fissures, which significantly lowered the bond strength in the area surrounding the mortar matrix…”

Section: Rca Microstructurementioning

confidence: 99%

“…However, a suitable concrete mix design enables the RCA to achieve target strength in wide range of application in construction. Kwan et al (2012) [2] achieved target strength even when 80% of the total coarse aggregate content was replaced by RCA. The same authors have reported that, even though the porous materials of adhered mortar could significantly increase the permeability, the curing period would control the intrinsic permeability of RCA for the long term durability of the concrete structure.…”

Section: Introductionmentioning

confidence: 99%

“…Most CDW in Malaysia was formerly assumed nonusable and illegally discarded. To date, these wastes are totally utilize as recycled/reused concrete aggregates and are benefited for various applications in construction [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Engineering Behavior of Concrete with Recycled Aggregate

et al. 2016

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Abstract. Concrete is extensively used as construction materials in Malaysia. Concrete contributes suitable feature for construction industry for instance durability, adequate compressive strength, fire resistance, availability and is economic as compared to other construction materials. Depletion of natural resources and disposal of construction and demolition waste remarkably claim environmental threat. In this paper, the engineering behavior, durability, and concrete microstructure of recycled concrete aggregates (RCA) on short-term concrete properties were investigated. The studied concrete at design mix proportion of 1:0.55:2.14:2.61 (weight of cement :coarse aggregates :sand :water) used to obtain medium-high compressive strength with 20%, 50%, and 100% of RCA. Results show that for the same water/cement ratio, RCA replacement up to 50% still achieved the targeted compressive strength of 25 MPa at 28 curing days. Addition, at similar RCA replacement, the highest carbonation depth value was found at 1.03 mm which could be attributed to the pozzolanic reaction, thus led to lower carbonation resistance. Scanning electron microscopy microstructure shows that the RCA surface was porous and covered with loose particles. Moreover, the interfacial transition zone was composed of numerous small pores, micro cracks, and fissures that surround the mortar matrix. On the basis of the obtained results, recommendable mineral admixtures of RCA are necessary to enhance the quality of concrete construction.

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Section: Compressive Strengthsupporting

confidence: 82%

Section: Compressive Strengthmentioning

confidence: 96%

Section: Rca Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Engineering Behavior of Concrete with Recycled Aggregate

et al. 2016

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Mechanical properties of concrete with recycled aggregates and waste glass

Letelier

Tarela

Osses

et al. 2017

Structural Concrete

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The present investigation analyses the mechanical behaviour of concrete with recycled aggregates from precast debris and waste glass. The combination of both recycled materials permits an increased amount of recycled coarse aggregates reducing the loss of mechanical performance of the concrete, and enhances the environmental value of the final material. Four variables are considered: the percentage of recycled course aggregates, the amount of mortar adhered to their surface, the amount of cement replaced by recycled glass powder and the maximum particle size. The final goal is to determine the significance of each variable in the final product and identify the most efficient combination to optimize the performance of the concrete, maximizing its environmental value. Significant results have been obtained, showing that the calibration of the parameters may not be trivial.

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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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Influence of the amount of recycled coarse aggregate in concrete design and durability properties

Cited by 171 publications

References 12 publications

Engineering Behavior of Concrete with Recycled Aggregate

Engineering Behavior of Concrete with Recycled Aggregate

Mechanical properties of concrete with recycled aggregates and waste glass

Simulation study on the shear transfer behavior of recycled aggregate concrete

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