Hydration characteristics and modeling of ternary system of municipal solid wastes incineration fly ash-blast furnace slag-cement

Wan, Sha; Zhou, Xian; Zhou, Min; Han, Yi; Chen, Yuchi; Geng, Jiang; Wang, Teng; Xu, Shang‐Zhong; Qiu, ZeDong; Hou, Haobo

doi:10.1016/j.conbuildmat.2018.05.277

Cited by 66 publications

(27 citation statements)

References 38 publications

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“…It shows the presence of numerous crystalline phases, including calcium sulfates, sodium sulfate, sodium chloride, etc. The crystalline phases detected in the tested materials are in agreement with findings from the literature [15,23,24]. However, we note here that MSWIFA can be a very variable material in terms of its bulk oxide composition and crystalline phases, and generalizations regarding its chemistry should be done with caution.…”

Section: Materials Caosupporting

confidence: 90%

“…Broken pieces of paste were stored in absolute ethyl alcohol for 2 days to stop hydration. After 2 days, filtration was performed, followed by drying under vacuum at 40 • C for 1 day [24]. The pieces were then ground and sieved through a 45-µm mesh and the resulting powder was used for XRD and leaching tests.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…In mixtures without LFS, the encapsulation process is slower. The Cr encapsulation mechanism may be explained using the literature [6,[9][10][11]22,24,[28][29][30][31][32][33][34][35][36]. It is known that calcium sulfoaluminate hydrates play an exceptional role as Cr immobilizers.…”

Section: Hydrate Evolutionmentioning

confidence: 99%

“…It is known that calcium sulfoaluminate hydrates play an exceptional role as Cr immobilizers. Cr can partially replace the aluminum in ettringite [22] and can also be integrated into the Friedel's salt layers, either through ionic substitution or by surface adsorption [9,10,24,[34][35][36]. Cr can also be incorporated into the C-S-H as insoluble chromium hydroxides [6,32].…”

Section: Hydrate Evolutionmentioning

confidence: 99%

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Optimal Mixture Designs for Heavy Metal Encapsulation in Municipal Solid Waste Incineration Fly Ash

et al. 2020

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Mixing municipal solid waste incineration fly ash (MSWIFA) with industrial by-products such as ground granulated blast furnace slag (GGBFS) and ladle furnace slag (LFS) can lead to a hardened system which can encapsulate the heavy metals present in the MSWIFA. The objective of this study is to find optimal mixture designs to effectively encapsulate these heavy metals. The nature of the hydrates and the strength of the mixtures are studied to develop a sustainable and practical construction material incorporating MSWIFA. Heavy metals including Cr, Cu, Zn and Cd are safely encapsulated in several developed mixtures with leachate concentration below EPA drinking water limit. The encapsulation behavior is complex and depends on metal type, age of testing, and hydration products. In general, mixtures containing LFS have more aluminate hydrates, and show greater encapsulation capacity for most heavy metals. However, they also generally show significant Sb leaching. Mixtures which show satisfactory encapsulation for all ions and adequate strength development are identified. Three ideal mixtures, including one containing zero cement, are identified which satisfy both leaching and strength requirements.

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Section: Materials Caosupporting

confidence: 90%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Hydrate Evolutionmentioning

confidence: 99%

Section: Hydrate Evolutionmentioning

confidence: 99%

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Optimal Mixture Designs for Heavy Metal Encapsulation in Municipal Solid Waste Incineration Fly Ash

et al. 2020

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“…Industrial waste such as granulated blast-furnace slag (GGBFS) and coal fly ash are widely adopted as complementary cementitious materials. Municipal solid waste incineration (MSWI) fly ash shares similar characteristics to coal fly ash, including chemical composition and heat history [6,7]. One of the most common strategies for the management of MSWI fly ash residues has been treatment followed by landfill as its chemical composition requires proper stabilization before disposal.…”

Section: Introductionmentioning

confidence: 99%

Application of Fly Ash and Slag Generated by Incineration of Municipal Solid Waste in Concrete

Zeng

Liu

Wang

et al. 2020

Advances in Materials Science and Engineering

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As landfill space for the disposal of products of municipal solid waste incineration (MSWI) such as fly ash and slag becomes increasingly scarce, a reduction of disposed material is urgently required. The method of using incineration products in concrete production is explored in this paper through a feasibility study of utilizing fly ash and slag to replace cement and coarse aggregate in appropriate proportions. Results show that C30 concrete optimum replacement rates of fly ash and slag are 30% and 20%, which can meet the minimum strength requirement. The leaching concentrations of Cu, Zn, Pb, Cr, and Cd in MSWI concrete samples are determined to be less than the identification value of solid waste leaching toxicity. Based on scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses, MSWI fly ash has certain dispersion. The particle size of MSWI fly ash is determined to be close to that of the coal fly ash, and the surface morphology is irregular. The main components include SiO2, CaCO3, and Ca2SiO4, and they are similar to those present in the coal fly ash. The slag structure is loose as well as irregular, and its main component is SiO2. The SiO2 and Al2O3 in fly ash and slag participate in the hydration reaction of cement and can increase concrete strength. It is thus confirmed that fly ash and slag generated by waste incineration can be used to replace cement and coarse aggregate in appropriate proportions, and it is an effective method to solve the problem of scarcity of solid waste landfill space.

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Treatment and Management of Hazardous Solid Waste Stream by Incineration

Kamaruddin,

Lee,

Norashiddin

et al. 2023

Handbook of Environmental Engineering

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Hydration characteristics and modeling of ternary system of municipal solid wastes incineration fly ash-blast furnace slag-cement

Cited by 66 publications

References 38 publications

Optimal Mixture Designs for Heavy Metal Encapsulation in Municipal Solid Waste Incineration Fly Ash

Optimal Mixture Designs for Heavy Metal Encapsulation in Municipal Solid Waste Incineration Fly Ash

Application of Fly Ash and Slag Generated by Incineration of Municipal Solid Waste in Concrete

Treatment and Management of Hazardous Solid Waste Stream by Incineration

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