Shear behavior of reinforced concrete beams made from recycled coarse and fine aggregates

Mahmoud, Firas Al; Boissière, R.; Mercier, C.; Khelil, A.

doi:10.1016/j.istruc.2020.03.015

Cited by 42 publications

(19 citation statements)

References 20 publications

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“…These procedures can benefit from the surface roughness to improve concrete contribution to shear resistance. [15,[20][21][22][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66] highlights the literature focusing on RCA's effects on shear strength, with the last three rows focusing specifically on the effect of fibers addition on shear strength of RCA. RCA generally decreases shear strength in beams as well as cylindrical push-off specimens [22,50,52,[55][56][57][58]61], in addition, other research efforts indicated that shear strength is decreasing as the RCA replacement ratio increases [15,63].…”

Section: Concrete Contribution To Shear Resistancementioning

confidence: 99%

“…Table 1 [ 15 , 20 , 21 , 22 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 ] highlights the literature focusing on RCA’s effects on shear strength, with the last three rows focusing specifically on the effect of fibers addition on shear strength of RCA. RCA generally decreases shear strength in beams as well as cylindrical push-off specimens [ 22 , 50 , 52 , 55 , 56 , 57 , 58 , 61 ], in addition, other research efforts indicated that shear strength is decreasing as the RCA replacement ratio increases [ 15 , 63 ]. This reduction is caused by a myriad of factors, such as remaining mortar on RA and higher water absorption due to increased porosity in RA in comparison to normal weight aggregate (NWA) [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Concrete Contribution To Shear Resistancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

Ghoneim

Yehia

et al. 2020

Materials

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“…In their study Han et al [ 166 ] stated that the RC beams with 100% RCA showed larger deflection and less shear strength than the control beams with virgin aggregate. However, Al Mahmoud [ 167 ] reported similar shear behavior of the RCA beams compared to the NCA beams in terms of the load-deflection diagram. González-Fonteboa and Martínez-Abella [ 168 ] have investigated the shear behavior of recycled concrete with 50% RCA and highlighted little differences in terms of midspan deflection and ultimate load capacity.…”

Section: Literature Reviewmentioning

confidence: 96%

Green Concrete for a Circular Economy: A Review on Sustainability, Durability, and Structural Properties

et al. 2021

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A primary concern of conventional Portland cement concrete (PCC) is associated with the massive amount of global cement and natural coarse aggregates (NCA) consumption, which causes depletion of natural resources on the one hand and ecological problems on the other. As a result, the concept of green concrete (GC), by replacing cement with supplementary cementitious materials (SCMs) such as ground granulated blast furnace slag (GGBFS), fly ash (FA), silica fume (SF), and metakaolin (MK), or replacing NCA with recycled coarse aggregates, can play an essential role in addressing the environmental threat of PCC. Currently, there is a growing body of literature that emphasizes the importance of implementing GC in concrete applications. Therefore, this paper has conducted a systematic literature review through the peer-reviewed literature database Scopus. A total of 114 papers were reviewed that cover the following areas: (1) sustainability benefits of GC, (2) mechanical behavior of GC in terms of compressive strength, (3) durability properties of GC under several environmental exposures, (4) structural performance of GC in large-scale reinforced beams under shear and flexure, and (5) analytical investigation that compares the GC shear capacities of previously tested beams with major design codes and proposed models. Based on this review, the reader will be able to select the optimum replacement level of cement with one of the SCMs to achieve a certain concrete strength range that would suit a certain concrete application. Also, the analysis of durability performance revealed that the addition of SCMs is not recommended in concrete exposed to a higher temperature than 400 °C. Moreover, combining GGBFS with FA in a concrete mix was noticed to be superior to PCC in terms of long-term resistance to sulfate attack. The single most striking observation to emerge from the data comparison of the experimentally tested beams with the available concrete shear design equations is that the beams having up to 70% of FA as a replacement to OPC or up to 100% of RCA as a replacement to NCA were conservatively predicted by the equations of Japan Society of Civil Engineers (JSCE-1997), the American Concrete Institute (ACI 318-19), and the Canadian Standards Association (CSA-A23.3-14).

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“…Research on recycled concrete material properties mainly involves strength [5], carbonization performance [6], durability [7], and creep performance studies [8]. Studies on the mechanical properties of recycled concrete components mainly include the bending performance of the slab [9,10], the deformation performance [11], the compression performance [12] and the shearing performance [13] of the column, as well as the deformation performance [14], the bending performance [15] and the shearing performance [16][17][18][19][20][21][22] of the beam. In actual engineering, the main failure mode of concrete beams is shear failure.…”

Section: Introductionmentioning

confidence: 99%

“…Hereinafter, the concrete itemized shear resistance of recycled concrete beams will be referred to as SRRC. A number of studies on the overall shear resistance of recycled concrete beams exist [16][17][18][19][20][21], as well as reports on the size effect of the concrete itemized shear resistance of original concrete beams [26][27][28][29][30][31]. However, research on the size effect of SRRC has been limited, with only one report by Zhao et al found in the literature [22].…”

Section: Introductionmentioning

confidence: 99%

Size Effect of Shear Strength of Recycled Concrete Beam without Web Reinforcement: Testing and Explicit Finite Element Simulation

et al. 2021

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Recycled concrete is a form of low-carbon concrete with great importance. The explicit finite element method is an economical and feasible method for analyzing static concrete structures, such as those made of recycled concrete. The shear strength of regular concrete beams has size effects. In this study, a group of physical tests on the size effect of the shear strength of recycled concrete beams without web reinforcement was carried out under the condition of a constant shear span ratio. The research results show that the shear strength of the test beam generally decreases with the increase in beam section height, and a regression formula of the shear strength was obtained, which can formulate this effect. The rationale and feasibility of the explicit finite element method solving the ultimate load of concrete structures (which can derive the shear strength) were briefly demonstrated, and an explicit finite element simulation of test beams was carried out. Results showed an obvious and phenomenologically regular size effect of the shear strength of recycled concrete beams without web reinforcement, which can be simulated by the explicit finite element method. This research aims to promote the study of low-carbon recycled concrete structures to a certain extent and encourage the application of economic explicit finite element methods for the static analysis of concrete structures.

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Shear behavior of reinforced concrete beams made from recycled coarse and fine aggregates

Cited by 42 publications

References 20 publications

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

Green Concrete for a Circular Economy: A Review on Sustainability, Durability, and Structural Properties

Size Effect of Shear Strength of Recycled Concrete Beam without Web Reinforcement: Testing and Explicit Finite Element Simulation

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