Self-alkali-activated self-cementation achievement and mechanism exploration for the synergistic treatment of the municipal solid waste incineration fly ashes and the arsenic-contaminated soils

Huang, Tao; Song, Dong-Ping; Zhou, Lulu; Pan, Longwei; Zhang, Shuwen

doi:10.1016/j.chemosphere.2023.138397

Cited by 15 publications

(2 citation statements)

References 68 publications

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“…Human activities and population growth raise the energy demands for construction materials and produce a substantial volume of solid waste across diverse sectors like steel and iron production, mining, power production, agriculture, and the production of electronic goods [1][2][3]. The handling and disposal of such waste streams have resulted in significant economic and environmental consequences.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis of Geopolymer Materials: Properties, Environmental Impacts, and Applications

Sbahieh,

McKay,

Al-Ghamdi

2023

Materials

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The advancement of eco-friendly technology in the construction sector has been improving rapidly in the last few years. As a result, multiple building materials were developed, enhanced, and proposed as replacements for some traditional materials. One notable example presents geopolymer as a substitute for ordinary Portland concrete (OPC). The manufacturing process of (OPC) generates CO2 emissions and a high energy demand, both of which contribute to ozone depletion and global warming. The implementation of geopolymer concrete (GPC) technology in the construction sector provides a path to more sustainable growth and a cleaner environment. This is due to geopolymer concrete’s ability to reduce environmental pollutants and reduce the construction industry’s carbon footprint. This is achieved through its unique composition, which typically involves industrial byproducts like fly ash or slag. These materials, rich in silicon and aluminum, react with alkaline solutions to form a binding gel, bypassing the need for the high-energy clinker production required in OPC. The use of such byproducts not only reduces CO2 emissions but also contributes to waste minimization. Additionally, geopolymer offers extra advantages compared to OPC, including improved mechanical strength, enhanced durability, and good stability in acidic and alkaline settings. Such properties make GPC particularly suitable for a range of construction environments, from industrial applications to infrastructure projects exposed to harsh conditions. This paper comprehensively reviews the different characteristics of geopolymers, which include their composition, compressive strength, durability, and curing methods. Furthermore, the environmental impacts related to the manufacturing of geopolymer materials were evaluated through the life-cycle assessment method. The result demonstrated that geopolymer concrete maintains positive environmental impacts due to the fact that it produces fewer carbon dioxide CO2 emissions compared to OPC concrete during its manufacturing; however, geopolymer concrete had some minor negative environmental impacts, including abiotic depletion, human toxicity, freshwater ecotoxicity, terrestrial ecotoxicity, and acidification. These are important considerations for ongoing research aimed at further improving the sustainability of geopolymer concrete. Moreover, it was determined that silicate content, curing temperature, and the proportion of alkaline solution to binder are the major factors significantly influencing the compressive strength of geopolymer concrete. The advancement of geopolymer technology represents not just a stride toward more sustainable construction practices but also paves the way for innovative approaches in the field of building materials.

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Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis of Geopolymer Materials: Properties, Environmental Impacts, and Applications

Sbahieh,

McKay,

Al-Ghamdi

2023

Materials

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“…Moreover, the financial input was estimated to be increased to CNY trillions in 2020 to encourage technological innovation and improvement in the remediation of contaminated sites [1]. On this basis, quite a few technologies are proposed and subsequently proven to be available to treat heavy metal-contaminated soils, such as physical separation, incineration, solidification/stabilization (S/S), thermal desorption, and so on [2][3][4][5]. Among the various innovative technologies, the S/S method has been extensively adopted and investigated.…”

Section: Introductionmentioning

confidence: 99%

Review of the Interactions between Conventional Cementitious Materials and Heavy Metal Ions in Stabilization/Solidification Processing

Liu

Tan

et al. 2023

Materials

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In the past few decades, solidification/stabilization (S/S) technology has been put forward for the purpose of improving soil strength and inhibiting contaminant migration in the remediation of heavy metal-contaminated sites. Cement, lime, and fly ash are among the most common and effective binders to treat contaminated soils. During S/S processing, the main interactions that are responsible for improving the soil’s behaviors can be summarized as gelification, self-hardening, and aggregation. Currently, precipitation, incorporation, and substitution have been commonly accepted as the predominant immobilization mechanisms for heavy metal ions and have been directly verified by some micro-testing techniques. While replacement of Ca2+/Si4+ in the cementitious products and physical encapsulation remain controversial, which is proposed dependent on the indirect results. Lead and zinc can retard both the initial and final setting times of cement hydration, while chromium can accelerate the initial cement hydration. Though cadmium can shorten the initial setting time, further cement hydration will be inhibited. While for mercury, the interference impact is closely associated with its adapted anion. It should be pointed out that obtaining a better understanding of the remediation mechanism involved in S/S processing will contribute to facilitating technical improvement, further extension, and application.

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Study on the relation between macro-mechanical properties and micro-structure of geopolymers with different activator modulus

Wang,

Zhao,

Zheng

et al. 2023

Environ Sci Pollut Res

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Self-alkali-activated self-cementation achievement and mechanism exploration for the synergistic treatment of the municipal solid waste incineration fly ashes and the arsenic-contaminated soils

Cited by 15 publications

References 68 publications

Comprehensive Analysis of Geopolymer Materials: Properties, Environmental Impacts, and Applications

Comprehensive Analysis of Geopolymer Materials: Properties, Environmental Impacts, and Applications

Review of the Interactions between Conventional Cementitious Materials and Heavy Metal Ions in Stabilization/Solidification Processing

Study on the relation between macro-mechanical properties and micro-structure of geopolymers with different activator modulus

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