Recycled use of municipal solid waste incinerator fly ash and ferronickel slag for eco-friendly mortar through geopolymer technology

Long, Wu-Jian; Peng, Jun-kai; Gu, Yu-cun; Li, Jinlin; Dong, Bo‐Qing; Xing, Feng; Yuan, Fang

doi:10.1016/j.jclepro.2021.127281

Cited by 46 publications

(6 citation statements)

References 65 publications

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“…A number of geopolymer matrixes with high SiO 2 and Al 2 O 3 concentrations were mixed with MSWI FA to induce geopolymerization reactions using alkali excitation to bind the polymer and heavy metal ions. 125 A study by Wang et al 126 reflected that fly ash based geopolymers prepared with sodium silicate and sodium hydroxide composite activators can immobilize up to about 99.9% of heavy metals in fly ash, and most of the metals in the solidified body are amorphous. Calcium carbonate oligomers are precursors in the gel state to effectively solidify/stabilize heavy metals in MSWI FA.…”

Section: Mechanochemical Methodmentioning

confidence: 99%

“…Al-Ghouti et al highlighted that MSWI FA can be utilized as a substitute for cement in many aspects. A number of geopolymer matrixes with high SiO 2 and Al 2 O 3 concentrations were mixed with MSWI FA to induce geopolymerization reactions using alkali excitation to bind the polymer and heavy metal ions . A study by Wang et al reflected that fly ash based geopolymers prepared with sodium silicate and sodium hydroxide composite activators can immobilize up to about 99.9% of heavy metals in fly ash, and most of the metals in the solidified body are amorphous.…”

Section: Treatment and Disposal Of Heavy Metals In Fly Ashmentioning

confidence: 99%

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Advances and Outlook of Heavy Metal Treatment Technology from Municipal Solid Waste Incineration Fly Ash: A Review

Xiao,

Huang,

Cheng

et al. 2023

Energy Fuels

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With the global industrialization process and socioeconomic development, the amount of municipal solid waste (MSW) generated is growing significantly. With the growth trend of municipal solid waste, incineration is widely used for waste treatment but produces a large amount of municipal solid waste incineration fly ash, which contains heavy metals that can seriously harm human health and the ecological environment. In this Review, the current situation of MSWI fly ash disposal is reviewed, and the technologies for harmless disposal and resource utilization of heavy metals in MSWI fly ash are summarized, including solidification stabilization, leaching extraction, heat treatment, combination methods, etc. We meticulously summarized the recent progress of various incineration fly ash disposal technologies, analyzed the difficulties and solutions in formulating various feasible technical strategies, and compared their potential in the safe, environmentally friendly, and economical utilization of MSW fly ash resources. Furthermore, we also provide an outlook on the potential challenges and prospects of future progress in the harmless disposal and resource recycling of fly ash.

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Section: Mechanochemical Methodmentioning

confidence: 99%

Section: Treatment and Disposal Of Heavy Metals In Fly Ashmentioning

confidence: 99%

Advances and Outlook of Heavy Metal Treatment Technology from Municipal Solid Waste Incineration Fly Ash: A Review

Xiao,

Huang,

Cheng

et al. 2023

Energy Fuels

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“…Long et al [55] studied the morphology of municipal solid waste incineration fly ash (MSWI-FA) and ferronickel slag (FNS), known geopolymer precursors, to determine whether these precursors can have an excellent interfacial bonding. MWSI-FA is registered as irregular and spherical particles, indicating a high surface area, while FNS is rough and porous, creating a good bonding interaction with the binder (Figure 10) [55]. SEM can also be used to study the morphology of the starting materials such as precursors [53,54].…”

Section: Scanning Electron Microscopy With Energy-dispersive Spectros...mentioning

confidence: 99%

Geopolymers as Sustainable Material for Strengthening and Restoring Unreinforced Masonry Structures: A Review

et al. 2021

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Unreinforced masonry (URM) structures are vulnerable to earthquakes; thus, materials and techniques for their strengthening and restoration should be developed. However, the materials used in some of the existing retrofitting technologies for URM and the waste produced at its end-of-life are unsustainable. The production of ordinary Portland cement (OPC) worldwide has enormously contributed to the global carbon footprint, resulting in persistent environmental problems. Replacing OPC with geopolymers, which are more sustainable and environmentally friendly, presents a potential solution to these problems. Geopolymers can replace the OPC component in engineering cementitious composites (ECC), recommended to strengthen and restore URM structures. In the present paper, the state-of-the-art knowledge development on applying geopolymers in URM structures is discussed. The discussion is focused on geopolymers and their components, material characterization, geopolymers as a strengthening and restoration material, and fiber-reinforced geopolymers and their application to URM structures. Based on this review, it was found that the mechanical properties of geopolymers are on par with that of OPC; however, there are few studies on the mentioned applications of geopolymers. The characterization of geopolymers’ mechanical and physical properties as a restoration material for URM structures is still limited. Therefore, other properties such as chemical interaction with the substrate, workability, thixotropic behavior, and aesthetic features of geopolymers need to be investigated for its wide application. The application method of geopolymer-based ECC as a strengthening material for a URM structure is by grouting injection. It is also worth recommending that other application techniques such as deep repointing, jacketing, and cement-plastering be explored.

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“…The compaction pressure is 28 N/mm 2, and the sintering temperature is 1140 • C. MSW was treated with a sintering time of 60 min, producing the favorable sintered material in making concrete [13], followed by Sikalidis [14], who studied and demonstrated the feasibility and advantages of this method in 2002. Similarly, researchers investigated the casting techniques on Supplementary Cementitious Materials (SCM) with MSW-BA [15], with different kinds of cement (calcium aluminate cement, asphalt cement, Portland cement) [16,17] and geopolymer to prepare mortar with MSW [18]. When MSW bottom ash is used as aggregate in the cement composite, the aluminum-induced hydrolysis reactions can lead to hydrogen gas generation, which can induce porosity and have a detrimental effect on the cement composite [19].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Different Grain Size of Municipal Solid Waste Bottom Ash in High-Performance Mortars

Guo

Sharma

et al. 2022

Sustainability

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Globalization is bringing increased industrialization and municipal solid waste (MSW). This is a major concern in heavily populated areas. In order to reduce MSW generation, incineration is commonly used, resulting in two types of ashes: bottom and fly ash. Bottom ash is gathered at the incineration bed and is larger in mass than fly ash. To test the qualities of high-performance mortar, MSW-BA in three sizes (fine, medium, and coarse) was replaced with sand at three replacement levels of 10%, 20%, and 30%. The high-performance mortar integrating MSW-BA was tested for hardened density, mechanical properties such as compressive and flexural strength, resistance to NaOH solution, and heavy metal leaching. The substitution level of MSW-BA increased the hardened density of the mortar mixes. The volume change and residual strength of the mortar mixes were measured following exposure to the NaOH solution. Fine-particle mortar mixes shrank whereas medium- and coarse-particle mortar mixes expanded. The largest loss in flexural and compressive strength was recorded when 20% of sand was replaced with a fine fraction of MSW-BA. Heavy metals including cadmium and copper were not leached from MSW-BA combinations of any size. The minuscule amounts of lead and zinc discovered were well below acceptable limits. The present study illustrates the MSW-BA can be utilized as a substitute for sand in the development of high-performance mortar.

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Recycled use of municipal solid waste incinerator fly ash and ferronickel slag for eco-friendly mortar through geopolymer technology

Cited by 46 publications

References 65 publications

Advances and Outlook of Heavy Metal Treatment Technology from Municipal Solid Waste Incineration Fly Ash: A Review

Advances and Outlook of Heavy Metal Treatment Technology from Municipal Solid Waste Incineration Fly Ash: A Review

Geopolymers as Sustainable Material for Strengthening and Restoring Unreinforced Masonry Structures: A Review

Utilization of Different Grain Size of Municipal Solid Waste Bottom Ash in High-Performance Mortars

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