Comparison of ternary and dual combined waste-derived alkali activators on the durability of volcanic ash-based geopolymers

Zheng, Yanjin; Rao, Feng; Yang, Lu; Zhong, Shuiping

doi:10.1016/j.cemconcomp.2022.104886

Cited by 16 publications

(3 citation statements)

References 51 publications

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“…Additionally, geopolymer-based materials can enhance structural performance in terms of overall structural performance, fire resistance, and thermal insulation. The creation of highperformance building goods requires such characteristics [16][17][18][19][20].…”

Section: Potential Benefits Of Geopolymerizationmentioning

confidence: 99%

Circular Economy Enabler: Enhancing High-Performance Bricks through Geopolymerization of Plastic Waste

Haq,

Sood,

Kumar

et al. 2023

E3S Web Conf.

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This article investigates the merging of geopolymerization and plastic waste usage, imagining high-performance brick production that couples innovation with sustainability, in an effort to transform the environmental effect of the building sector. This idea is supported by the circular economy, which diverts resources from waste streams into a closed-loop paradigm. By creating inorganic polymers from aluminosilicate-rich sources, the chemical process of geopolymerization provides a paradigm change in the production of materials. This procedure is improved even more by the addition of plastic trash, which combats plastic pollution and improves brick qualities. In order to create a more resilient and environmentally conscientious construction industry in the future, this paper outlines the process’s complexities, advantages, and difficulties while arguing for a harmonic fusion of circular economy concepts, technical innovation, and environmental stewardship.

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Section: Potential Benefits Of Geopolymerizationmentioning

confidence: 99%

Circular Economy Enabler: Enhancing High-Performance Bricks through Geopolymerization of Plastic Waste

Haq,

Sood,

Kumar

et al. 2023

E3S Web Conf.

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“…To further reduce carbon emissions in AAC, researchers have started exploring the use of alkalis and salts (such as Ca(OH) 2 , Na 2 CO 3 , CaCO 3 , and NaAlO 2 ) with lower alkalinity and carbon emissions as activators or supplementary activators in AAC production [38][39][40][41][42][43]. Ma et al [42] utilized Na 2 CO 3 as a partial replacement for sodium silicate to prepare AAC based on slag and slag-fly ash, and found that the use of Na 2 CO 3 effectively reduced CO 2 emissions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Na2CO3 Replacement Quantity and Activator Modulus on Static Mechanical and Environmental Behaviours of Alkali-Activated-Strain-Hardening-Ultra-High-Performance Concrete

Zhuo,

Chen,

Luo

et al. 2024

Buildings

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The application of alkali-activated concrete (AAC) shows promise in reducing carbon emissions within the construction industry. However, the pursuit of enhanced performance of AAC has led to a notable increase in carbon emissions, with alkali activators identified as the primary contributors. In an effort to mitigate carbon emissions, this study introduces Na2CO3 as a supplementary activator, partially replacing sodium silicate. The objective is to develop a low-carbon alkali-activated-strain-hardening-ultra-high-performance concrete (ASUHPC). The experimental investigation explores the impact of varying levels of Na2CO3 replacement quantity (0, 0.75 Na2O%, and 1.5 Na2O%) and activator modulus (1.35, 1.5, and 1.65) on the fresh and hardened properties of ASUHPC. The augmentation of Na2CO3 replacement quantity and activator modulus are observed to extend the setting time of the paste, indicating an increase in the modulus of the activator and Na2CO3 replacement quantity would delay the setting time. While the use of Na2CO3 intensifies clustering in the fresh paste, it optimizes particle grading, resulting in higher compressive strength of ASUHPC. The tensile crack width of ASUHPC conforms to the Weibull distribution. ASUHPC with a Na2CO3 replacement quantity of 0.75 Na2O% exhibits superior crack control capabilities, maintaining a mean crack width during tension below 65.78 μm. The tensile properties of ASUHPC exhibit improvement with increasing Na2CO3 replacement quantity and activator modulus, achieving a tensile strength exceeding 9 MPa; otherwise, increasing the activator modulus to 1.5 improves the deformation capacity, reaching 8.58%. Moreover, it is observed that incorporating Na2CO3 as a supplementary activator reduces the carbon emissions of ASUHPC. After considering the tensile performance indicators, increasing the activator modulus can significantly improve environmental performance. The outcomes of this study establish a theoretical foundation for the design of low-carbon, high-performance-alkali-activated-strain-hardening-ultra—high-performance concrete.

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“…More and more scholars are becoming interested in geopolymers due to their wide range of cheap raw materials, simple and normal-temperature synthesis process and great adaptive and adsorption capacities [27][28][29][30][31]. The raw materials for geopolymerization reactions typically consist of aluminosilicates and silicoaluminates [32].…”

Section: Introductionmentioning

confidence: 99%

Behaviors and Mechanisms of Adsorption of MB and Cr(VI) by Geopolymer Microspheres under Single and Binary Systems

Fang,

Yang,

Rao

et al. 2024

Molecules

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Geopolymers show great potential in complex wastewater treatment to improve water quality. In this work, general geopolymers, porous geopolymers and geopolymer microspheres were prepared by the suspension curing method using three solid waste products, coal gangue, fly ash and blast furnace slag. The microstructure, morphology and surface functional groups of the geopolymers were studied by SEM, XRD, XRF, MIP, FTIR and XPS. It was found that the geopolymers possess good adsorption capacities for both organic and inorganic pollutants. With methylene blue and potassium dichromate as the representative pollutants, in order to obtain the best removal rate, the effects of the adsorbent type, dosage of adsorbent, concentration of methylene blue and potassium dichromate and pH on the adsorption process were studied in detail. The results showed that the adsorption efficiency of the geopolymers for methylene blue and potassium dichromate was in the order of general geopolymers < porous geopolymers < geopolymer microspheres, and the removal rates were up to 94.56% and 79.46%, respectively. Additionally, the competitive adsorption of methylene blue and potassium dichromate in a binary system was also studied. The mechanism study showed that the adsorption of methylene blue was mainly through pore diffusion, hydrogen bond formation and electrostatic adsorption, and the adsorption of potassium dichromate was mainly through pore diffusion and redox reaction. These findings demonstrate the potential of geopolymer microspheres in adsorbing organic and inorganic pollutants, and, through five cycles of experiments, it is demonstrated that MGP exhibits excellent recyclability.

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Comparison of ternary and dual combined waste-derived alkali activators on the durability of volcanic ash-based geopolymers

Cited by 16 publications

References 51 publications

Circular Economy Enabler: Enhancing High-Performance Bricks through Geopolymerization of Plastic Waste

Circular Economy Enabler: Enhancing High-Performance Bricks through Geopolymerization of Plastic Waste

Effect of Na2CO3 Replacement Quantity and Activator Modulus on Static Mechanical and Environmental Behaviours of Alkali-Activated-Strain-Hardening-Ultra-High-Performance Concrete

Behaviors and Mechanisms of Adsorption of MB and Cr(VI) by Geopolymer Microspheres under Single and Binary Systems

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