Shear behaviour of reinforced construction and demolition waste-based geopolymer concrete beams

Aldemir, Alper; Akduman, Şaban; Kocaer, Öznur; Aktepe, Rafet; Şahmaran, Mustafa; Yıldırım, Gürkan; Almahmood, Hanady; Ashour, Ashraf

doi:10.1016/j.jobe.2021.103861

Cited by 24 publications

(29 citation statements)

References 24 publications

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“…EDS is a qualitative method, and based only on this research, it is not possible to obtain information about the quantitative composition of the material. However, this test confirms the similarity of this material to other investigated compositions and confirm the usefulness of this material to the geopolymerization process [17,19,22]. The chemical composition of fly ash (class F) contains less than 5% unburned carbon, less than 10% iron compounds, and a small amount of calcium.…”

Section: Methodssupporting

confidence: 78%

“…The compressive strength tests of the samples showed values of 37.5 MPa and 36.6 MPa, respectively. In turn, the tensile strength values were NGC-2.56 MPa and NGC-R-2.37 MPa [19].…”

Section: Introductionmentioning

confidence: 93%

“…Aldemir et al [19] conducted studies of geopolymer composites based on demolition construction waste. The geopolymer composites included clay brick, tile, hollow brick, concrete waste (rubble), and glass.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Mechanical Properties and Microstructure of Construction- and Demolition-Waste-Based Geopolymers

et al. 2022

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Construction and demolition waste (CDW) is the third-most abundant waste generated annually in the countries of the European Union. One of the alternatives to the use of these wastes is geopolymeric materials. Partial replacement of commonly used raw materials for the production of these materials can help reduce the number of landfills and the consumption of natural resources. In this study, the authors partially replaced metakaolin and fly ash with clay bricks and concrete debris. The research method in article is connected with analysis of microstructures and the mechanical and physical properties of the geopolymers. The results obtained show the possibility of manufacturing useful construction materials based on industrial byproducts (fly ash) and CDW. Compressive strength and flexural strength were, for samples containing metakaolin, 20.1 MPa and 5.3 MPa, respectively. Geopolymers containing fly ash displayed 19.7 MPa of compressive strength and 3.0 MPa of flexural strength. The results for both synthesized materials give them perspectives for future applications in the construction industry.

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Section: Methodssupporting

confidence: 78%

“…The compressive strength tests of the samples showed values of 37.5 MPa and 36.6 MPa, respectively. In turn, the tensile strength values were NGC-2.56 MPa and NGC-R-2.37 MPa [19].…”

Section: Introductionmentioning

confidence: 93%

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Investigation of Mechanical Properties and Microstructure of Construction- and Demolition-Waste-Based Geopolymers

et al. 2022

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“…In addition to the research by Liu et al [ 77 ], other authors also verified the feasibility of applying ceramic waste to RA. Yang et al [ 78 ] evaluated the properties of foam concrete containing ceramic waste as RA; Aldemir et al [ 79 ] evaluated the shear behavior of concrete beams containing ceramic waste as RA. In both surveys, the results obtained were very satisfactory.…”

Section: Ra From Other Wastesmentioning

confidence: 99%

Recycled Aggregate: A Viable Solution for Sustainable Concrete Production

et al. 2022

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Construction and demolition activities consume large amounts of natural resources, generating 4.5 bi tons of solid waste/year, called construction and demolition waste (C&DW) and other wastes, such as ceramic, polyethylene terephthalate (PET), glass, and slag. Furthermore, around 32 bi tons of natural aggregate (NA) are extracted annually. In this scenario, replacing NA with recycled aggregate (RA) from C&DW and other wastes can mitigate environmental problems. We review the use of RA for concrete production and draw the main challenges and outlook. RA reduces concrete’s fresh and hardened performance compared to NA, but these reductions are often negligible when the replacement levels are kept up to 30%. Furthermore, we point out efficient strategies to mitigate these performance reductions. Efforts must be spent on improving the efficiency of RA processing and the international standardization of RA.

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“…Because most of the natural sand deposits are being depleted due to the continuous exploitation, the use of an alternative fine aggregate in concrete is gaining attention. Previously, various authors have investigated the effect on concrete of the partial replacement of different materials, such as crushed rock particles, pond ash, manufactured sand, washed soil, quarry dust, pond ash, copper slag, powdered brick, offshore sand, construction demolition waste and powdered glass [37][38][39][40][41]. Copper slag is also the industrial by-product obtained during the matte-smelting process of raw copper.…”

Section: Introductionmentioning

confidence: 99%

Development of High-Strength Geopolymer Concrete Incorporating High-Volume Copper Slag and Micro Silica

Arunachelam¹,

Maheswaran

Chellapandian³

et al. 2022

Sustainability

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The present work investigates the mechanical and chemical characteristics and durability of high-strength geopolymer concrete (HSGPC) developed using high-volume copper slag and micro silica. The objective of the study was to explore the feasibility of deploying high-volume copper slag as a replacement for river sand in the fabrication of high-strength geopolymer concrete. In total, 11 different trials were cast by varying copper slag up to 100% as a potential alternative for the river sand. The mixture of alkaline activators for the preparation of the geopolymer concrete (GPC), such as sodium silicate (Na2SiO3) and sodium hydroxide (12 M NaOH), was used in the ratio 2.5:1. The optimum mix was selected from different copper slag dosages based on the characteristics of the HSGPC, such as mechanical strength and workability. For the selected optimized mix, micro silica was added up to 5% by volume of the binder (i.e., 1%, 2%, 3%, 4% and 5%) to improve the particle packing density of the developed HSGPC mix which in turn further enhances the strength and durability properties. Two different curing methods, including (a) ambient curing and (b) steam curing at 80 °C, were deployed for achieving the polymerization reaction (i.e., the formation of Na-Al-Si-H gel). Experimental outcomes reveal a maximum compressive strength of 79.0 MPa when 2% micro silica was added to the optimized GPC mix. In addition to the mechanical tests, the quality of the developed HSGPC was assessed using the ultrasonic pulse velocity (UPV) tests, water-absorption tests, sorptivity tests and microstructural analyses.

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Shear behaviour of reinforced construction and demolition waste-based geopolymer concrete beams

Cited by 24 publications

References 24 publications

Investigation of Mechanical Properties and Microstructure of Construction- and Demolition-Waste-Based Geopolymers

Investigation of Mechanical Properties and Microstructure of Construction- and Demolition-Waste-Based Geopolymers

Recycled Aggregate: A Viable Solution for Sustainable Concrete Production

Development of High-Strength Geopolymer Concrete Incorporating High-Volume Copper Slag and Micro Silica

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