Investigation on the hydration of CFBC fly ash

Sheng, Guanghong; Li, Qin; Zhai, Jianping

doi:10.1016/j.fuel.2012.02.008

Cited by 106 publications

(50 citation statements)

References 24 publications

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“…e desulfurization slag contains SO 3 in a form of anhydrite, and anhydrite hydrates very slowly [26][27][28][29]. Researches have shown that alkali and sulfate can improve the activity of modi ed desulfurization ash [30,31].…”

Section: In Uences Of Sodium Sulfate On Mortars As Shown Inmentioning

confidence: 99%

Research on the Expansion Characteristics and Compressive Strength of Mortars Containing Circulating Fluidized Bed Combustion Desulfurization Slag

Cheng

Hou

Han

et al. 2018

Advances in Materials Science and Engineering

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Circulating fluidized bed combustion (CFBC) desulfurization slag is a waste residue discharged from coal power plants. In this article, expansion characteristics and compressive strength of mortars containing CFBC desulfurization slag were evaluated, subjected to mechanical grinding time, the amount of additive, and chemical activation. Correlations between the linear expansion rate and compressive strength were investigated. e hydration products of cement-slag cementitious system were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). e results show that mechanical grinding can increase both the expansion and compressive strength of mortars containing CFBC desulfurization slag, and the compressive strength and linear expansion can develop in coordination. While increasing the amount of the fine desulfurization slag, the linear expansion rate increases, and the compressive strength reaches to the maximum when the amount is 30%. Moderate sodium sulfate as an activator can both promote the compressive strength and increase the expansion of mortars.

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Section: In Uences Of Sodium Sulfate On Mortars As Shown Inmentioning

confidence: 99%

Research on the Expansion Characteristics and Compressive Strength of Mortars Containing Circulating Fluidized Bed Combustion Desulfurization Slag

Cheng

Hou

Han

et al. 2018

Advances in Materials Science and Engineering

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“…The CFBC fly ashes have physicochemical properties different from those of conventional coal fly ashes. Sheng, Li [5] pointed out that the CFBC fly ashes with high content of free lime (f-CaO) and SO 3 have novel characteristics of self-cementing, similar to that of the ordinary Portland cement (OPC). The presence of f-CaO and SO 3 restricts the general applications of CFBC fly ash due to its excessive expansion of the ettringite (AFt) formation [5,6].…”

Section: Introductionmentioning

confidence: 99%

Influence of circulating fluidized bed combustion (CFBC) fly ash on properties of modified high volume low calcium fly ash (HVFA) cement paste

Nguyen

Chang

Shih

et al. 2015

Construction and Building Materials

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“…Therefore, anhydrous anhydrite (CaSO 4 ) is formed in the CFBC ashes. To increase the SO 2 absorption, the weight ratio of CaO (in absorbent) to SO 2 (in raw materials) is increased and the temperature is lowered (3). The CFBC combustion technique results in the CFBC ashes with physicochemical properties different from the conventional coal fly ashes.…”

Section: Introductionmentioning

confidence: 99%

“…The CFBC combustion technique results in the CFBC ashes with physicochemical properties different from the conventional coal fly ashes. Generally, the high free lime (f-CaO) from the unreacted absorbent and the anhydrite (CaSO 4 ) limit the utilization of CFBC ashes due to the expansion induced by ettringite (AFt) formation (3). Therefore, CFBC ashes significantly contribute to the annually increased solid wastes with sulfur, possibly leading to the pollutions in the air due to the ashes and on surface water due to the high alkalis.…”

Section: Introductionmentioning

confidence: 99%

Physical-chemical characteristics of an eco-friendly binder using ternary mixture of industrial wastes

Nguyen¹,

Chang²,

Chen³

et al. 2015

Mater. construcc.

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This study explores the physical-chemical characteristics of paste and mortar with an eco-friendly binder named as SFC cement, produced by a ternary mixture of industrial waste materials of ground granulated blast furnace slag (S), Class F fly ash (FFA), and circulating fluidized bed combustion fly ash (CFA). To trigger the hydration, the CFA, which acted as an alkaline-sulfate activator, was added to the blended mixture of slag and FFA. The water to binder ratio (W/B), curing regime, and FFA addition significantly affected the engineering performances and shrinkage/expansion of the SFC pastes and mortars. The SFC mortars had higher workability than that of ordinary Portland cement (OPC). With similar workability, the SFC mortars had compressive strengths and expansions comparable to OPC mortars. The main hydration products of the hardened SFC cement were ettringite (AFt) and C-S-H/C-A-S-H. The transformation of the AFt to the monosulfates was observed as the hydration time increased.

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Investigation on the hydration of CFBC fly ash

Cited by 106 publications

References 24 publications

Research on the Expansion Characteristics and Compressive Strength of Mortars Containing Circulating Fluidized Bed Combustion Desulfurization Slag

Research on the Expansion Characteristics and Compressive Strength of Mortars Containing Circulating Fluidized Bed Combustion Desulfurization Slag

Influence of circulating fluidized bed combustion (CFBC) fly ash on properties of modified high volume low calcium fly ash (HVFA) cement paste

Physical-chemical characteristics of an eco-friendly binder using ternary mixture of industrial wastes

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