Punching shear behavior of recycled aggregate reinforced concrete slabs

Mahmoud, Zaki I.; tony, El tony M. El; Saeed, Kawan S.

doi:10.1016/j.aej.2015.12.004

Cited by 18 publications

(8 citation statements)

References 3 publications

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“…The result of the leaching test for coal bottom ash coarse aggregate and porous concrete produced with these coarse aggregates, it was satisfied with the environmental criteria. In addition, studies related to various recycled and by-product aggregates have actively been conducted [13][14][15]. These previous studies are significant in that they inspired technologies that enabled the incorporation of recycled and by-product aggregates into concrete through the analysis of their physical properties.…”

Section: Introductionmentioning

confidence: 99%

Environmental Evaluation of Concrete Containing Recycled and By-Product Aggregates Based on Life Cycle Assessment

Roh

Kim²,

Park

et al. 2020

Applied Sciences

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This study aims to compare the potential environmental impact of the manufacture and production of recycled and by-product aggregates based on a life cycle assessment and to evaluate the environmental impact and cost when they are used as aggregates in concrete. To this end, the six potential environmental impacts (i.e., abiotic depletion potential, global warming potential, ozone-layer depletion potential, acidification potential, photochemical ozone creation potential, and eutrophication potential) of the manufacture and production of natural sand, natural gravel, recycled aggregate, slag aggregate, bottom ash aggregate, and waste glass aggregate were compared using information from life cycle inventory databases. Additionally, the environmental impacts and cost were evaluated when these aggregates were used to replace 30% of the fine and coarse aggregates in concrete with a design strength of 24 MPa. The environmental impact of concrete that incorporated slag aggregate as the fine aggregates or bottom ash aggregate as the coarse aggregates were lower than that of concrete that incorporated natural aggregate. However, concrete that incorporated bottom ash aggregate as the fine aggregates demonstrated relatively high environmental impacts. Based on these environmental impacts, the environmental cost was found to range from 5.88 to 8.79 USD/m3.

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Section: Introductionmentioning

confidence: 99%

Environmental Evaluation of Concrete Containing Recycled and By-Product Aggregates Based on Life Cycle Assessment

Roh

Kim²,

Park

et al. 2020

Applied Sciences

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“…Also, similar failure modes in recycled concrete slabs were reported in Refs. (Mahmoud et al, 2018; Xiao et al, 2018). Figure 8 shows that as RCA replacement percentage increased, the slab surface integrity was reduced.…”

Section: Resultsmentioning

confidence: 99%

“…The RILEM publication in 1994 was one of the most significant developments in promoting the use of recycled concrete aggregate in new concrete (RILEM, 1994). The use of RCA is important in the sense of preserving our living environment and conserving natural resources (Hansen and Narud, 1983; Mahmoud et al, 2018; Rao et al, 2012). RCAC, however, has low strength, a low elastic modulus, poor workability, high water absorption, high shrinkage, and creep (Francesconi and Pani, 2016; Mahmoud et al, 2018; Rao et al, 2012); on the other hand, it is well-known for its low thermal conductivity and low specific gravity, which decrease the structure’s self-weight (Francesconi and Pani, 2016; Rao et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Punching shear strength of recycled aggregate-steel fibrous concrete slabs with and without strengthening

Saadoon

Mashrei

Oumari

2022

Advances in Structural Engineering

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This paper presents an experimental study on the punching shear behavior of reinforced concrete flat slabs fabricated using recycled coarse aggregate (RCA) in addition to the presence of steel fibers strengthened by carbon fiber reinforced polymer (CFRP). The ratios of replacement natural coarse aggregate by RCA were (0, 35, 55, and 75%) and the volume fraction of the steel fiber used in this study was 1.2%. Two strengthening methods were used, namely, externally bonded reinforcement (EBR) and externally bonded reinforcement on groove (EBROG). 16 square slabs were cast with overall dimensions of 800 mm by 800 mm by 80 mm thickness. The slabs were designed to fail in punching shear only. All the slabs were simply supported on four edges and tested for punching via a vertical load applied through the square central column. The test results showed that the mechanical properties, ultimate loads, and first crack loads decreased with increasing proportion of RCA replacement, while the incorporation of steel fibers improved the compressive strength and ultimate loads by the ranges of 12%–17% and 16%–25%, respectively. Strengthened slabs lead to considerable improvements in the punching behavior of slabs, with an increase in punching load ranging from 22–30% compared to unstrengthened slabs when using the EBR technique, while the increase in the punching loads ranged between 40 and 55% when using EBROG strengthening technique. However, using half amount of CFRP with the EBROG method led to an increase in punching shear of 20–28%. This research indicates the particular improvement offered by the EBROG with regard to the punching shear capacity of fibrous recycled coarse aggregate concrete (RCAC) slabs compared to the EBR method. In addition, the mode of failure of reinforced concrete (RC) slabs changed from one of debonding failure to concrete cover separation when using the EBROG method.

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“…The partial replacement of natural coarse aggregates with recycled aggregates leads to reduction in stiffness, energy absorption and punching shear strength. The main reason for this was the replaced recycled aggregates were highly water absorption (Mahmoud, El tony, tony & Saeed, 2018). Mix design for production of concrete using sintered fly ash aggregates for the structural application based on tensile characteristics and also good in durability studies .…”

Section: Introductionmentioning

confidence: 99%

Behaviour of sintered fly ash aggregates and steel fibers on reinforced concrete slabs subjected to punching

Thenmozhi²

2022

rdlc

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In this study the optimum replacement percentage of sintered fly ash aggregates in M30 grade of concrete was identified based on 28 days cubical compressive strength value. The optimum replacement of Sintered Fly ash Aggregates (SFA) is 40 %. Before identifying the optimum replacement percentage, the SFAs were tested for suitability test such as crushing strength test, impact test and water absorption test. Further, the optimum 40 % SFAs in concrete is tested for punching shear on the Reinforced Concrete (RC) slabs for a dimension of 1000 mm x 1000 mm x 100 mm. In addition to know the effect of steel fibers in RC slabs subjected to punching. A hook ended steel fibers having an aspect ratio of 55, 80 and 100 is selected and varied by volume of concrete for the punching shear values on RC slabs. The RC slabs concrete contains aspect ratio of steel fibers 55 is varied for 0.25 %, 0.5 %, 0.75 % and 1 % for volume of concrete. In addition to that a constant volume of steel fiber 0.5 % is selected for the aspect ratios of 80 and 100 for the punching shear tests. The punching shear values for the RC slabs shows that partial replacement of SFAs and steel fibers in concrete enhances the punching shear strength. These experimental tested results are compared with finite element programming (ABAQUS) and international codes such as IS 456 and ACI 2011. The experimental punching shear results were higher when compared to international codes.

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Punching shear behavior of recycled aggregate reinforced concrete slabs

Cited by 18 publications

References 3 publications

Environmental Evaluation of Concrete Containing Recycled and By-Product Aggregates Based on Life Cycle Assessment

Environmental Evaluation of Concrete Containing Recycled and By-Product Aggregates Based on Life Cycle Assessment

Punching shear strength of recycled aggregate-steel fibrous concrete slabs with and without strengthening

Behaviour of sintered fly ash aggregates and steel fibers on reinforced concrete slabs subjected to punching

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