Evaluation of Potential Uses of AFBC Solid Wastes

Berry, E.E.; Anthony, Edward J.

doi:10.1557/proc-86-353

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…Instead the ash is irregularly shaped with its properties dependent on several variables. Major determining factors include the type of fuel used, the sorbent material selected, and fluctuations in operating conditions [8]. The particle size distribution varies from 25 to 20000 microns and the specific gravity ranges from 2.79 to 2.85.…”

Section: Methodsmentioning

confidence: 99%

A preliminary assessment of utilizing fluidized bed ash in landfill liner applications

Canty¹,

Atalay²,

Laguros³

et al. 1995

Journal of Environmental Science and Health . Part A: Environme

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A preliminary study was conducted to assess the possible utilization of fluidized bed ash (FBA) as a liner material. This material was selected based on its unique characteristics. It was anticipated that the pozzolanic properties would produce a hydraulic barrier with a low hydraulic conductivity and toxicity analysis would show no leachable metals. This hypothesis was tested utilizing FBA by itself and in combination with a clayey soil. Cursory physical and engineering tests were performed on the FBA and FBA/soil mixtures with regard to factors relevant for liner applications. Both the 100% FBA and the FBA/soil mixtures (15% and 40%) were found to have a hydraulic conductivity that was lower than federal requirements (1 × 10 -7 cm/sec). Also, the Toxicity Characteristics Leaching Procedure (TCLP) test results indicated that FBA was nonhazardous; therefore, it may not be a threat to groundwater. However, liner integrity may be in jeopardy due to the brittle nature of the FBA and FBA/soil mixtures, and also from the formation of ettringite.

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Section: Methodsmentioning

confidence: 99%

A preliminary assessment of utilizing fluidized bed ash in landfill liner applications

Canty¹,

Atalay²,

Laguros³

et al. 1995

Journal of Environmental Science and Health . Part A: Environme

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“…Poon et al [1] reported that, in the cement-fly ash binding system, calcium sulfate anhydrite can act as activating material, and a large quantity of ettringite (AFt) can be formed during the early stage of hydration in the anhydrite-activated cement-fly ash pastes. Iribarne et al [2] and Berry et al [3] indicated that CFB ash, rather than being particularly active in themselves, provided the components (lime, anhydrite) appropriate to induce sulpho-pozzolanic activity in fly ash or other pozzolans. CFB ash contains a large amount of CaO and forms calcium hydroxide in the presence of water.…”

Section: Introductionmentioning

confidence: 99%

Activation of Blast Furnace Slag with CFB Fly Ash as a Supplementary Binder Material: Hydration Products and Effects of Sulfate Attack

Chen

Huang

2021

Crystals

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Circulating Fluidized Bed (CFB) combustion is a clean technology for burning, with advantages of adapting to a large variety of fuel, high combustion efficiency, lower NOx emissions, and stable operation. The residue collected from the ash-hoppers of the electrostatic precipitator of the CFB boiler is called CFB fly ash. This paper presents the hydration development on the application of CFB fly ash to activating blast furnace slag (BFS) as a supplementary binder material (SBM) for replacement of Portland cement in making concrete. Investigation of the hydration products of cement pastes prepared with combinations of BFS and CFB fly ash were conducted by means of X-ray diffraction, thermal gravimetric analysis, and scanning electronic microscope. Test results show that the main hydration products of the CFB fly ash-BFS blended pastes were found to be hydrated calcium silicate (C-S-H), ettringite, gypsum, and some portlandite. Considering that CFB fly ash produced from the combustion of high-sulfur coke has high SO3 contents, the volume stability of mortar made from CFB fly ash-activated BFS was subjected to tests in accordance with ASTM C1012 and ASTM C1038 for evaluating the internal and external sulfate attack, respectively. The results indicate that, due to the high sulfur (SO3) content of CFB fly ash, the expansion caused by internal sulfate attack (ISA) increased with increasing proportion of CFB fly ash in the mixture. In contrast, no significant expansion was observed in the external sulfate attack (ESA) test, regardless of the proportion of CFB fly ash in the mixture. In order for the CFB fly ash to serve as a supplementary binder material and to maintain adequate volume stability, the amount of CFB fly ash used for the activation of BFS is recommended to be no more than 20% of the SBM.

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“…Alternatively, BFS activation can be achieved by the addition of calcium hydroxide (Ca(OH) 2 ) and soluble calcium [5]. CFB ash contains a large amount of CaO and forms calcium hydroxide (portlandite, Ca(OH) 2 ) in the presence of water.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Blending CFB Ash with Blast Furnace Slag as Replacement for Portland Cement Used in Concrete Binders

Chen

Huang

2013

AMR

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Circulating Fluidized Bed (CFB) Boiler is a means of energy-generating process by burning petroleum coke. In order to avoid blazed petroleum coke with high sulfur content from emitting overdosed sulfur dioxide, limestone is introduced in the boiler for desulfuration. The residue collected from the boiler is called CFB ash. In accordance with different boiler position, CFB ashes can be classified as fly ash and bed ash, and both have similar chemical compositions, with high contents of gypsum and calcium oxide. In this study, CFB ash (fly ash) is mixed with blast furnace slag (BFS) as a substitute for cement in making concrete. It is intended that CFB ashes can be used in concrete and a method for proportioning CFB ash in concrete can be developed. The results show that CFB ash can react with cement to produce hydration products such as Ca(OH)2, and bring the activation of blast furnace slag. The paste strength could be low at later ages, if the CFB ash content is too low. Whereas, if the CFB ash content is over 30%, the paste strength will be low at the early age. Therefore, it is concluded that the cement-granulated blast furnace slag system will show best performance at the CFB ash content between 18% and 22%. In autoclave soundness test shows the CFB ash of the high f-CaO content is easy reaction in the water, and also did not negatively affect the quality of the volume stability.

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Evaluation of Potential Uses of AFBC Solid Wastes

Cited by 5 publications

References 19 publications

A preliminary assessment of utilizing fluidized bed ash in landfill liner applications

A preliminary assessment of utilizing fluidized bed ash in landfill liner applications

Activation of Blast Furnace Slag with CFB Fly Ash as a Supplementary Binder Material: Hydration Products and Effects of Sulfate Attack

Investigation on Blending CFB Ash with Blast Furnace Slag as Replacement for Portland Cement Used in Concrete Binders

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