Mechanical properties of concrete with recycled coarse aggregate

Rahal, Khaldoun N.

doi:10.1016/j.buildenv.2005.07.033

Cited by 633 publications

(264 citation statements)

References 12 publications

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“…Moreover, the average reduction in the modulus of elasticity was 11%. Whereas the reduction was only 3.52% for the 20 percent replacement mix, close to what was reported by Rahal [3], it jumped above 10% for the other larger replacement percentages mixes. The average reduction in the flexural strength for the six mixes relative to the control mix with no RCA was 9.2%, and similar to the splitting tensile strength tests the reduction in flexural strength relative to the control mix was almost consistent for all percentage replacement values.…”

Section: Phasesupporting

confidence: 85%

“…Finally, the average reduction in the modulus of elasticity was 11.3%. The reduction was only 5.01% for the 20 percent replacement mix, close to what was reported by Rahal for NSC mixes [3], but ranged from 9.09 to 14.66% for the other larger replacement percentages mixes.…”

Section: Ascmces-17supporting

confidence: 85%

“…In 2007, Rahal compared several mechanical properties of RAC and NAC made with the same mix proportions to achieve a nominal concrete strength between 25 and 30 MPa [3]. Rahal concluded that at 28 days, the cube and cylinder compressive strength and the indirect shear strength of RAC were on the average 10% less than those of NAC.…”

Section: Research On Mechanical Properties Of Racmentioning

confidence: 99%

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Overview of studies on the effect of recycled aggregates sourced from tested cylinders on concrete material and structural properties

Hamad

Ali²

2017

MATEC Web Conf.

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Abstract. The paper presents an overview of a two-phase research program that was designed at the American University of Beirut (AUB) to investigate the effect of replacing different percentages of natural coarse aggregates (NCA) with recycled coarse aggregates (RCA) on the properties of the produced concrete. The source of RCA was tested cylinders in batching plants which would help recycling and reusing portion of the waste products of the concrete industry. In the first phase, the fresh and hardened mechanical properties of the produced concrete mix were investigated. The variables were the concrete strength (28 or 60 MPa) and the percentage replacement of NCA with RCA from crushed tested cylinders [0 (control), 20, 40, 60, 80, or 100%). Normal strength tested cylinders were used as source of the recycled aggregates for the normal strength concrete (NSC) mix and high strength tested cylinders were used for the high strength concrete (HSC) mix. Tests included plastic state slump and hardened state mechanical properties including cylinder compressive strength, cylinder splitting tensile strength, modulus of elasticity, and standard beams flexural strength. The results indicated no significant effect on the slump and around 10% average reduction in the hardened mechanical properties for both investigated levels of concrete compressive strength. In the second phase, the structural behavior of normal strength concrete (NSC) reinforced concrete beams prepared by replacing different percentages of NCA with RCA from tested concrete cylinders was studied. For each of three modes of failure (flexural, shear, or bond splitting), three beams with different percentages replacement [0 (control), 40, or 100 percent] were tested. One replicate was prepared for each beam to validate the test results. Results indicated no significant difference in the ultimate load reached or load-deflection behavior that could be related to the percentage replacement of NCA with RCA.

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Section: Phasesupporting

confidence: 85%

Section: Ascmces-17supporting

confidence: 85%

Section: Research On Mechanical Properties Of Racmentioning

confidence: 99%

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Overview of studies on the effect of recycled aggregates sourced from tested cylinders on concrete material and structural properties

Hamad

Ali²

2017

MATEC Web Conf.

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“…This behavior was also observed by other researchers (Corinaldesi and Moriconi, 2009;Gómez, 2002 (Katz, 2003;Topçu and Sengel, 2004;Martínez and Mendoza, 2006;Rahal, 2007;Casuccio et al, 2008) The r as function of exposure period is shown on Figure 7, proving that the use of 100% RCA increases concrete electric conductivity, which is attributed to the porosity increase reported by RCA concretes, that facilitate the ionic conductivity. The r of SCM-free systems (NA 100% PC and RCA 100% PC) do not exceed the 10 kW-cm threshold (Andrade and Alonso, 1996).…”

Section: Doi: 104067/so718-50732013000100002supporting

confidence: 83%

Corrosión por cloruros del acero de refuerzo embebido en concreto con agregado grueso reciclado y materiales cementantes suplementarios

et al. 2013

Rev. ing. constr.

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“…Reusing coarse recycled aggregates (CRA) from construction and demolition waste (C&DW) has been successfully implemented in road pavements 2,3 . In concrete production it is common practice today as a partial replacement of natural aggregates since various studies have demonstrated that its performance is satisfactory [4][5][6][7][8][9] . Also, the use of recycled aggregates on mortars has been studied with very interesting results reported [10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

A new method to determine the density and water absorption of fine recycled aggregates

2013

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The construction industry keeps on demanding huge quantities of natural resources, mainly minerals for mortars and concrete production. The depletion of many quarries and environmental concerns about reducing the dumping of construction and demolition waste in quarries have led to an increase in the procuring and use of recycled aggregates from this type of waste. If they are to be incorporated in concrete and mortars it is essential to know their properties to guarantee the adequate performance of the end products, in both mechanical and durability-related terms. Existing regulated tests were developed for natural aggregates, however, and several problems arise when they are applied to recycled aggregates, especially fine recycled aggregates (FRA). This paper describes the main problems encountered with these tests and proposes an alternative method to determine the density and water absorption of FRA that removes them. The use of sodium hexametaphosphate solutions in the water absorption test has proven to improve its efficiency, minimizing cohesion between particles and helping to release entrained air.

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Mechanical properties of concrete with recycled coarse aggregate

Cited by 633 publications

References 12 publications

Overview of studies on the effect of recycled aggregates sourced from tested cylinders on concrete material and structural properties

Overview of studies on the effect of recycled aggregates sourced from tested cylinders on concrete material and structural properties

Corrosión por cloruros del acero de refuerzo embebido en concreto con agregado grueso reciclado y materiales cementantes suplementarios

A new method to determine the density and water absorption of fine recycled aggregates

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