Flexural Testing of Reinforced Concrete Beams with Recycled Concrete Aggregates

Kang, Thomas H.‐K.; Kim, Woosuk; Kwak, Yoon Keun; Hong, Soon Hyung

doi:10.14359/51686622

Cited by 94 publications

(37 citation statements)

References 10 publications

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“…It can be noticed in Table 2 that recycled aggregates have a significant higher water absorption capacity and a lower density than natural ones. In spite of the high water absorption capacity of the used RCA, it remains within the range recommended by the design standards (McNeil and Kang 2013;Kang et al 2014).…”

Section: Aggregatesmentioning

confidence: 91%

Mix Design and Properties of Recycled Aggregate Concretes: Applicability of Eurocode 2

Wardeh

Ghorbel

Gomart

2014

Int J Concr Struct Mater

106

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This work is devoted to the study of fresh and hardened properties of concrete containing recycled gravel. Four formulations were studied, the concrete of reference and three concretes containing recycled gravel with 30, 65 and 100 % replacement ratios. All materials were formulated on the basis of S4 class of flowability and a target C35 class of compressive strength according to the standard EN 206-1. The paper first presents the mix design method which was based on the optimization of cementitious paste and granular skeleton, then discusses experimental results. The results show that the elastic modulus and the tensile strength decrease while the peak strain in compression increases. Correlation with the water porosity is also established. The validity of analytical expressions proposed by Eurocode 2 is also discussed. The obtained results, together with results from the literature, show that these relationships do not predict adequately the mechanical properties as well as the stress-strain curve of tested materials. New expressions were established to predict the elastic modulus and the peak strain from the compressive strength of natural concrete. It was found that the proposed relationship E-f c is applicable for any type of concrete while the effect of substitution has to be introduced into the stress-strain (e c1 -f c ) relationship for recycled aggregate concrete. For the full stress-strain curve, the model of Carreira and Chu seems more adequate.

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Section: Aggregatesmentioning

confidence: 91%

Mix Design and Properties of Recycled Aggregate Concretes: Applicability of Eurocode 2

Wardeh

Ghorbel

Gomart

2014

Int J Concr Struct Mater

106

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“…Unfortunately, concrete, our most common construction material uses a significant amount of non-renewable resources. Consequently, many researchers have investigated the use of recycled materials in the production of concrete such as fly ash [1][2][3][4][5][6][7] and recycled aggregate [8][9][10][11][12][13][14][15][16][17].…”

Section: Introduction and Research Significancementioning

confidence: 99%

“…But they observed that the beams with higher range of recycled aggregate showed higher level of concrete destruction at failure. Kang et al [16] used beams with longitudinal reinforcement ratio ranged between 0.5% and 1.8% with RCA replacement level up to 50% for both normal and high strength concrete. They observed greater number of cracks and lower cracking moment for RCA beams.…”

Section: Introduction and Research Significancementioning

confidence: 99%

An experimental study on flexural strength of reinforced concrete beams with 100% recycled concrete aggregate

Arezoumandi

Smith

Volz

et al. 2015

Engineering Structures

185

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“…Ongoing research is mainly related to recycled aggregate concrete (RAC), which is produced by substituting all or part of natural aggregates with recycled aggregates (i.e., crushed and sieved waste concrete debris). A series of studies on the mechanical properties [2,3], thermal performance [4], and durability [5] of RAC and on the performance of structural members with RAC (including slabs [6], beams [7,8], columns [9], wallboard [10], and frames [11]) have been carried out worldwide. Positive findings from these studies support and encourage the application of RAC in real buildings and structures.…”

Section: Introductionmentioning

confidence: 99%

Fire Behavior of U-shaped Steel Beams Filled with Demolished Concrete Lumps and Fresh Concrete

2018

Applied Sciences

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Abstract:To reuse waste concrete in a more straightforward and simplified way, a new kind of structural member containing fresh concrete (FC) and demolished concrete lumps (DCLs) distinctly larger than conventional recycled aggregates has been proposed. Previous research has shown that, at room temperature, the mechanical performance of the U-shaped steel beams filled with DCLs and FC is similar to that of the U-shaped steel beams filled with FC alone. This research explores the fire behavior of the U-shaped steel beams filled with DCLs and FC. Five specimens including three beams filled with DCLs and FC and two reference beams filled with FC alone were tested in fire. The experimental parameters included the replacement ratio of DCLs, the longitudinal reinforcement ratio, the load ratio, and the thickness of fire insulation. Based on the test results, numerical models in which the thermal resistance at the interface between the U-shaped steel and the in-filled concrete is considered are developed using SAFIR to determine the thermal and structural responses of the specimens. Lastly, parametric studies are carried out preliminarily to investigate the effects of some parameters on the fire resistance of such beams. It is found that the replacement ratio of DCLs within a range of 0% to 33% has a very limited effect on the temperature distribution, structural response, and fire resistance of the specimens, that embedding longitudinal reinforcements can significantly increase the fire resistance of such beams, that the interface thermal resistance can generate a temperature drop of up to 280 • C at the interface between the U-shaped steel and the in-filled concrete, and that the numerical models are capable of predicting the thermal and structural responses of such beams.

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Flexural Testing of Reinforced Concrete Beams with Recycled Concrete Aggregates

Cited by 94 publications

References 10 publications

Mix Design and Properties of Recycled Aggregate Concretes: Applicability of Eurocode 2

Mix Design and Properties of Recycled Aggregate Concretes: Applicability of Eurocode 2

An experimental study on flexural strength of reinforced concrete beams with 100% recycled concrete aggregate

Fire Behavior of U-shaped Steel Beams Filled with Demolished Concrete Lumps and Fresh Concrete

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