Utilization of Recycled Coarse Aggregate in Concrete Mixes

Abdelfatah, Akmal; Tabsh, Sami W.; Yehia, Sherif

doi:10.17265/1934-7359/2011.06.010

Cited by 8 publications

(9 citation statements)

References 7 publications

(2 reference statements)

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“…The experimental test results demonstrate that the tensile strength of pervious concrete drops from 1.56 MPa when natural aggregate is used to 0.67 MPa when recycled aggregate is used. Although concrete employing recycled aggregate is expected to be weaker in tension when compared with concrete containing natural aggregate, the observed drop is much more drastic when compared with previous studies by the authors [56][57][58][59][60][61] on non-pervious concrete. The inferior quality of the recycled coarse aggregate due to its higher water absorption, lower density, possible content of organic substances, higher level of crushability, and reduced abrasion resistance contributes to lower tensile strength of pervious concrete.…”

Section: Split Tensile Strengthcontrasting

confidence: 56%

“…The tests showed that 100% replacement of the aggregate caused the compressive strength of pervious concrete to reduce by 36%, from 7.08 to 4.53 MPa. Earlier studies by the first two authors [56][57][58][59][60][61] on non-pervious concrete have indicated the full replacement of natural coarse aggregate with recycled aggregate from construction demolition waste obtained from the same source can reduce the compressive strength by an average of just 10-15%. The lack of adequate amount of fine aggregate in pervious concrete increases the importance of the coarse aggregates and the bond between them to the mechanical properties of the concrete.…”

Section: Compressive Strengthmentioning

confidence: 99%

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Pervious Concrete Made with Recycled Coarse Aggregate and Reinforced with Date Palm Leaves Fibers

Tamimi,

Tabsh,

El-Emam

2023

Materials

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This study considers 12 pervious concrete mixes incorporating 100% recycled coarse aggregate from old concrete demolition waste and containing various amounts of natural fine aggregate and date palm leaves fibers. First, the properties of the recycled aggregate in terms of their particle size distribution, abrasion resistance, crushing values, specific gravity and water absorption are obtained. Next, the pervious concrete density, compressive strength, tensile strength, permeability and porosity are determined by experimental testing following the relevant standards. The results are analyzed and compared to determine the influence of using recycled coarse aggregate in the mixtures and the impact of the amount of natural sand and volume fraction of the fibers on the mechanical properties, permeability and porosity of the concrete. Findings of the study showed that the use of recycled coarse aggregate in pervious concrete without fine aggregate reduced the compressive strength by 36% and tensile strength by 57%. Replacing 11.7% of the recycled coarse aggregate with natural sand and adding date palm leaves fibers in an amount equivalent to 0.64% volumetric content to such concrete helped increase the compressive strength by 16.2% and tensile strength by 3.2% above the corresponding strengths of the control mix. There is a clear relationship between permeability and porosity due to their correlation with the density of pervious concrete, and the effect of porosity on tensile strength is more influential than it is on the compressive strength. An equation that can predict the tensile strength of pervious concrete from the compressive strength is proposed, as a function of the natural fine aggregate fraction of the coarse aggregate and volumetric content of natural fibers. Results of the research confirm the feasibility of using recycled aggregate in pervious concrete mixes and the positive impact of natural fibers on the mechanical properties.

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Section: Split Tensile Strengthcontrasting

confidence: 56%

Section: Compressive Strengthmentioning

confidence: 99%

Pervious Concrete Made with Recycled Coarse Aggregate and Reinforced with Date Palm Leaves Fibers

Tamimi,

Tabsh,

El-Emam

2023

Materials

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“…However, concerns about variability of recycled aggregate (RA) properties have limited the use of RCA in structural applications. Several research efforts were devoted to evaluating fresh and hardened concrete properties containing different percentages of coarse recycled aggregate [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. However, research conducted on the structural behavior of RCA is limited and often contradictory.…”

Section: Introductionmentioning

confidence: 99%

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

Ghoneim

Yehia

et al. 2020

Materials

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In this paper, shear strength of fiber reinforced recycled concrete was investigated. A Self Consolidated Concrete (SCC) matrix with 100% coarse recycled aggregate and different types of fibers were used in the study. Steel (3D and 5D), synthetic and hybrid fibers with a volume fraction of 0.75% were added to the concrete matrix to prepare eight beams. In addition, two beams were cast without fibers as control specimens. All beams were prepared without shear reinforcement and were tested to evaluate concrete contribution to the shear capacity. In addition, optical images were captured to allow for full-field displacement measurements using Digital Image Correlation (DIC). The results showed about 23.44–64.48% improvement in the average concrete shear capacity for fiber-reinforced beams when compared to that of the control specimens. The percentage improvement was affected by fiber type and the steel fiber beams achieved the best performance. The addition of the fiber delayed the crack initiation and improved the post-cracking and ductile behavior of all beams. Moreover, the experimental results were compared to those predicted by codes and proposed equations found in the literature for concrete strength with and without fibers.

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“…Some other studies [10,11] concluded that the use of admixtures or silica fume can improve the concrete strength, when using recycled aggregates. The concrete strength, after using admixtures, showed values that are very close to those of the concrete made with natural aggregates.…”

Section: B Properties Of Concrete Produced By Recycled Aggregatesmentioning

confidence: 99%

Examining the Variability of Recycled Concrete Aggregate Properties

2016

4th International Conference on Advances in Agricultural, Biological &Amp; Ecological Sciences (AABES-16) Dec. 1-2, 2016 London

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Abstract-Agencies concerned with the maintenance of concrete structures in the UAE are aware of the substantial increase in repair work in recent years. This can be attributed to the fact that many structures are now either reaching the end of their design life or the rapid deterioration due to loading and harsh environmental conditions. Such cases usually result in huge amount of concrete rubbles that are routinely discarded. Hence, there is a need to study the potential of using recycled concrete in new construction projects. This may lead to lower construction costs and savings in natural resources.Using Recycled Aggregates (RA), as a partial or full replacement of natural aggregates, may improve the sustainability of constructed projects. However, properties of the RA depend on the source of the parent aggregate, loading and exposure conditions. Such variability is a major concern to most of the contractors, governmental agencies, aggregate providers, and professional engineers. Therefore, this study focuses on the variability in the properties of RA produced from recycled concrete. Samples were collected from different batches, which are produced by a local recycling plant, over 1 year to monitor the variability in physical and mechanical properties of RA. One sample of natural aggregate was evaluated to serve as a bench mark for comparing the results obtained for RA. Properties included in the experimental work are variability in aggregate size (20 mm and 10 mm), shape and texture, gradation, specific gravity, water absorption, and crushing value. The conclusions based on the results from different batches showed some variation in the RA properties. The specific gravity was in the range of 2.35 to 2.47, the water absorption varied from 2.8% to 5.9%, the loss in the Los Angeles (LA) abrasion test showed a range of 25% to 35%, and the crushing value was almost (19%-26%). The obtained results are comparable with results reported in other studies in different parts of the world.

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Utilization of Recycled Coarse Aggregate in Concrete Mixes

Cited by 8 publications

References 7 publications

Pervious Concrete Made with Recycled Coarse Aggregate and Reinforced with Date Palm Leaves Fibers

Pervious Concrete Made with Recycled Coarse Aggregate and Reinforced with Date Palm Leaves Fibers

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

Examining the Variability of Recycled Concrete Aggregate Properties

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