Development of artificial one-part geopolymer lightweight aggregates by crushing technique

Xu, Ling-Yu; Qian, Lan-Ping; Dai, Jian‐Guo

doi:10.1016/j.jclepro.2021.128200

Cited by 59 publications

(18 citation statements)

References 61 publications

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“…As with C&DW, aggregates obtained from geopolymers are a viable option for the development of AR replacing NA. This information was highlighted in the research by Xu et al [ 92 ], where the authors evaluated the possibility of producing artificial aggregates using geopolymer aggregate concrete for light coarse aggregate. Although the mechanical performance obtained with the use of geopolymer aggregate was lower than that of natural aggregates, the scarcity of this material makes the use of this RA class a viable alternative.…”

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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Section: Ra From Other Wastesmentioning

confidence: 99%

Recycled Aggregate: A Viable Solution for Sustainable Concrete Production

et al. 2022

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“…After determining the optimal ratio of the mixture, the manufacturing process proceeds with mixing the ingredients. There are two methods for making artificial aggregates: the pelletization method using a granulator pan and the crushing method using a crusher [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…The manufacture of artificial aggregates using the crushing method comprised of several stages, including mixing, casting, crushing, and curing [17]. The first step in the manufacture of geopolymer aggregates was mixing.…”

Section: Introductionmentioning

confidence: 99%

Manufacture of Geopolymer Artificial Aggregates by Pelletization and Crushing Processes

Adhitya¹,

Saggaff²,

Saloma³

et al. 2023

cea

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Aggregates are an important ingredient of concrete. They are of two types: coarse aggregates and fine aggregates. The supply of natural aggregates on Earth is declining with technological advancement, hence, alternatives to natural aggregates are needed. Artificial aggregates have been manufactured using a coal burning waste, i.e. fly ash. On mixing fly ash with an alkaline activator, the mixture reacts and hardens. Aggregates are manufactured either by mixing materials using a granulator pan or by crushing materials using a stone crusher. The optimal manufacturing method was determined by comparing physical properties, such as bulk specific gravity, water absorption, and aggregate hardness, of the aggregates manufactured using these two methods with those of natural coarse aggregates. The average bulk specific gravity was 1.776 and 1.857 for the aggregates produced by the pelletization and crushing processes, respectively, and 2.957 for the natural aggregates. The average water absorption values were 11.62% and 8.37% for the aggregates produced by the pelletization and crushing processes, respectively, and 4.17% for the natural aggregates. The average aggregate hardness values, determined using the Los Angeles abrasion test, were 27.33% and 25.98% for aggregates produced by the pelletization and crushing processes, respectively, and 24.05% for the natural aggregates.

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“…As such, there is a pressing need to replace natural aggregates (NA) with more sustainable alternatives, including artificial aggregates (AA) and recycled aggregates (RA). The former are typically manufactured through sintering, geopolymerization, cement-bonding, or cold-forming processes [13][14][15]. Aside from their environmental benefits, past research has highlighted their lightweight and high absorption capacity, leading to a loss in performance in the AA-based concrete compared to NA-based counterparts [13,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…The former are typically manufactured through sintering, geopolymerization, cement-bonding, or cold-forming processes [13][14][15]. Aside from their environmental benefits, past research has highlighted their lightweight and high absorption capacity, leading to a loss in performance in the AA-based concrete compared to NA-based counterparts [13,[16][17][18]. While RA have a similar impact on the properties of concrete, their various environmental benefits have led to significant advances and the development of recycling facilities to produce the highest possible quality of RA [19,20].…”

Section: Introductionmentioning

confidence: 99%

Environmental and Economic Life Cycle Assessment of Recycled Aggregates Concrete in the United Arab Emirates

2021

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This paper studies the potential environmental and economic impact of replacing natural aggregates (NA) with recycled aggregates (RA) in the production of different sustainable concrete mixes in the United Arab Emirates (UAE). A life cycle assessment (LCA) was carried out according to the methodology proposed by the international standards of the series ISO 14040. The performance of concrete mixes having a similar design compressive strength was evaluated. Results showed that the inclusion of steel fibers (SF) led to an increase in the global warming potential (GWP), whereas mixes with cement replacement by fly ash, slag, or microsilica recorded a reduction in GWP. Furthermore, SF-reinforced mixes created with 100% RA were at least three times more expensive than the NA-based control mix, while the cost of those with cement replacement by mineral additives was generally similar to that of the control. Material transportation was found to be a main contributor to the environmental and economic impacts, only second to cement, and its contribution increased with longer distances and steel fiber incorporation and decreased with RA replacement. To integrate these individual measures and select optimum mixes for various applications, multifunctional performance indices were developed. Research findings highlight the possibility to fully replace NA with RA (100%) while maintaining the performance and improving the economic and environmental impacts of concrete produced in the UAE.

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Development of artificial one-part geopolymer lightweight aggregates by crushing technique

Cited by 59 publications

References 61 publications

Recycled Aggregate: A Viable Solution for Sustainable Concrete Production

Recycled Aggregate: A Viable Solution for Sustainable Concrete Production

Manufacture of Geopolymer Artificial Aggregates by Pelletization and Crushing Processes

Environmental and Economic Life Cycle Assessment of Recycled Aggregates Concrete in the United Arab Emirates

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