Shear strength of reinforced concrete deep beams containing recycled concrete aggregate and recycled asphalt pavement

Soltanabadi, Reza; Behfarnia, Kiachehr

doi:10.1016/j.conbuildmat.2021.125597

Cited by 21 publications

(8 citation statements)

References 32 publications

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“…With respect to the results obtained for large specimens, it was observed that load-deflection curves of RAP deep beams were completely different than those of NCA and RCA, and the absorbed energy of NA and RCA deep beams was almost identical, but for RAP deep beams, the absorbed energy was higher. Moreover, the shear capacity of deep beams containing RAP was lower than RCA and NA specimens, but the shear failure mode was similar for all specimens [46].…”

Section: Introductionmentioning

confidence: 84%

Economical Assessment of Recycled Asphalt Pavement (RAP) Aggregate for Structural Concrete Production in Italy

Peduzzi,

Franco,

De Luca

et al. 2023

Buildings

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Structural concrete aggregate can be substituted with sustainable alternatives from construction and demolition waste, such as reclaimed asphalt pavement (RAP). This contribution assesses the RAP aggregate production chain and aims to investigate the economic aspect of RAP aggregate, evaluating the costs associated with its production and comparing them with the ones necessary to produce NA and recycled concrete aggregate (RCA). This analysis aims to provide additional information on the possible advantages of RAP aggregate use in order to promote sustainable construction. The evaluation was developed using a four-step methodology consisting of (i) determining the RAP aggregate production procedure; (ii) selecting a case study; (iii) defining the mix design; and (iv) performing a cost evaluation and comparing it to the cost of NA and RCA production. The results of the cost analysis of three concretes containing different RAP percentages (0%, 30%, and 45%) demonstrated that RAP’s presence led to more expensive admixtures, with the RAP unit cost being higher than NA (+155.39%). Some strategies were proposed to diminish RAP’s cost, resulting in a reduction of −39.64% with respect to NA’s cost and ranging from 45.13% to 67.30% when compared to RCA’s cost.

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Section: Introductionmentioning

confidence: 84%

Economical Assessment of Recycled Asphalt Pavement (RAP) Aggregate for Structural Concrete Production in Italy

Peduzzi,

Franco,

De Luca

et al. 2023

Buildings

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“…Most of the available research on the shear behavior of structural concrete made with recycled aggregate suggests that beams made with RA concrete possess either just about the same or marginally inferior ultimate shear strength compared to corresponding beams made with NA concrete. Table 2 summarizes some of the related research efforts found in the literature [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Performance Of Concrete Structures Prepared With Ramentioning

confidence: 99%

The Structural Behavior of Reinforced Concrete Beams Made with Locally Produced Recycled Aggregate in the UAE

Sagheer,

Tabsh,

Yehia

2023

Buildings

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In this study, the feasibility of utilizing locally produced coarse recycled aggregate (RA) from demolition waste in the UAE for structural applications was investigated. A comprehensive literature review on the subject showed that the shear and flexural responses of reinforced beams utilizing aggregate from concrete demolition waste are greatly dependent on the aggregate replacement ratio and the quality of the recycled aggregate. The experimental program in this study consisted of three phases. Phase I focused on the evaluation of the physical and mechanical characteristics of the RA, Phase II addressed the mix design and fresh and hard properties of the concrete, and Phase III dealt with the flexural and shear behavior of structural members. The research involved twelve 150 mm × 300 mm reinforced concrete beams with a length of 1500 mm or 2000 mm that were made with 0% (control), 50%, or 100% recycled coarse aggregate, replacing natural coarse aggregate (NA). Two target concrete compressive strengths, 25 and 35 MPa, were considered in the investigation. The results showed that the recycled aggregates had lower crushing and LA abrasion values by 40% and 18–28%, respectively, whereas the absorption capacity was 40–300% higher compared to the natural aggregate. In addition, the mechanical properties of the concrete made with different replacement ratios (R%) of RA were either similar or slightly less than those of the control mix. The shear beam tests with fc′ = 25 MPa showed that the 50%- and 100%-replacement-ratio beams demonstrated closely matched normalized shear strength values that exceeded their corresponding NA beam by 12.5%, while the shear beam tests with fc′ = 35 MPa showed that the NA beam exhibited normalized shear strength surpassing the 50% RA and 100% RA beams by 12.5% and 17.5%, respectively. In the flexural beam tests, the flexural strength exhibited minimal disparities for the beams that shared the same RA% but differed in their compressive strength targets, and overall, the variation in the RA% had a marginal impact on the flexural strength of the beams. Further, an increase in the RA% corresponded to an increase in the shear ductility index, which was in contrast with the findings on the flexural ductility index. Furthermore, predictions of flexural strength using the ACI318-19 code and shear strength using the strut-and-tie model yielded comparable results to the experimental ones.

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“…A beam with ber and an opening size of 165 x 170 mm had a shear capacity that was 37.8% greater than a beam without bers. Soltanabadi and Behfarnia [15] studied the behavior of deep beams with recycled asphalt pavements (RAP), recycled concrete aggregates (RCA), and natural coarse aggregates (NCA) Soltanabadi et.al. [16] investigated numerically the behavior of reinforced concrete deep beams containing NCA, RCA, and RAP..…”

Section: Introductionmentioning

confidence: 99%

Sustainable precast composite deep beams including concrete with partial replacement (50%) of recycled coarse aggregate

Shakir,

Alghazali

2024

Preprint

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Three new sustainable models of a hybrid deep beam have been proposed in this work, which are the curved (CRV) and the arched (ARC1) and the modified arched (ARC2) in addition to the conventional (HRL) hybrid model that uses recycled coarse aggregates (RCA) instead of natural aggregates. The specimens indicate that steel fiber concrete (SFC) is used in high stress concentration areas and sustainable concrete is used in other areas. In relation to the parameters, the effects of hybridization types and inclined stirrups have all been studied. Results revealed that the failure capacity was increased by 8%, 22%, 21%, and 22%, for the for hybrid models respectively. On the other hand, the specimen (CTRL-SFC) showed a 19% enhancement. Regarding the flexural toughness, enhancement in 13%, 39%, 34%,71% for the hybrid models respectively compared to the non-hybrid model (CTRL-R50).The respective enhancement for the specimen (CTRL-SFC) was 52%.For the effective stiffness, results showed small range of enhancement (1.5-9)%. It is evident that the specimens' internal reinforcement detailing is adequate to stop the semi-diagonal mode of failure, which is an extremely brittle mode of failure. Furthermore, a replacement rate of up to 50% does not significantly affect the overall response. Moreover, The results of the tests indicated that the inclined alignment of the stirrups prevented diagonal cracking more than their vertical alignment. The proposed curved and arched models may be used with multi-concentrated loads, prestressed beam, precast walls. The proposed models aimed to produce lightweight / sustainable /low cost /high performance precast deep beams with compared to the horizontal hybrid model.

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Shear strength of reinforced concrete deep beams containing recycled concrete aggregate and recycled asphalt pavement

Cited by 21 publications

References 32 publications

Economical Assessment of Recycled Asphalt Pavement (RAP) Aggregate for Structural Concrete Production in Italy

Economical Assessment of Recycled Asphalt Pavement (RAP) Aggregate for Structural Concrete Production in Italy

The Structural Behavior of Reinforced Concrete Beams Made with Locally Produced Recycled Aggregate in the UAE

Sustainable precast composite deep beams including concrete with partial replacement (50%) of recycled coarse aggregate

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