Potential of Co-Fired Fly Ashes as a Construction Material – A Review

Ram, Shashi; Tare, Meghna S.; Aswath, Pranesh B.; Ralegaonkar, Rahul V.

doi:10.1016/b978-0-12-803581-8.11173-7

Cited by 5 publications

(2 citation statements)

References 56 publications

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“…At 3 d and 28 d, the strengths of both CFA and CCFA samples were lower than the REF, and kept in decreasing tendency with increasing blends. It can be explained that fly ash replaces a portion of the cement to result in a reduced hydration degree and make the early strength grow slow [58,59]. As the curing age increased, the secondary hydration reaction of fly ash took place, gradually exhibiting pozzolanic activity [55,60].…”

Section: Mechanical Properties and Pozzolanic Activity Of Scmsmentioning

confidence: 99%

Investigating the Hydration, Mechanical Properties, and Pozzolanic Activity of Cement Paste Containing Co-Combustion Fly Ash

Ding,

Du,

et al. 2024

Buildings

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The heat of hydration, mechanical properties, pozzolanic activity, and microscopic characteristics of cement pastes incorporating co-combusted fly ash (CCFA) were investigated, and the disparities between the CCFA/cement system and the coal fly ash (CFA) binding system were also compared. The results indicate a decrease in the heat of hydration for both CFA and CCFA samples, with a more pronounced trend observed as the fly ash content increased from 10% to 30%. The distinction in the early hydration between CFA and CCFA samples primarily manifested in the rate of heat release, potentially correlated with variations in the active Al2O3 content in the fly ash. Neither CFA nor CCFA samples exhibited significant cementitious activity at 3 days, functioning solely as inert fillers in the cement paste. By 3 and 28 days, the mechanical properties of both CFA and CCFA samples were inferior to those of pure cement paste. However, by 180 days of hydration, the compressive strength of CCFA-blended mortar notably increased, with the highest strength observed in the 10% CCFA-blended sample. Both CFA and CCFA samples produced the secondary hydration product C-A-S-H and demonstrated comparable consumption of calcium hydroxide (CH). These findings underscore the potential of CCFA as a supplementary cementitious material (SCM) and lay a foundation for its widespread adoption.

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Section: Mechanical Properties and Pozzolanic Activity Of Scmsmentioning

confidence: 99%

Investigating the Hydration, Mechanical Properties, and Pozzolanic Activity of Cement Paste Containing Co-Combustion Fly Ash

Ding,

Du,

et al. 2024

Buildings

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“…Zhang et al adopted a single-particle combustion method, studied the effects of K, Na, Ca, and Mg on the combustion characteristics of pine sawdust and bituminous coal, and found that K played the strongest promotion effect in co-combustion [18]. Economically and environmentally, co-combustion coal with other sources of energy is regarded as a prospective and attractive choice [19,20]. The previous research has predominantly concentrated on binary blending [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Characteristics of Catalysis Synergy during Co-Combustion for Coal Gasification Fine Slag with Bituminous Coal and Bamboo Residue

et al. 2021

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As a kind of solid waste from coal chemical production, the disposal of coal gasification fine slag poses a certain threat to the environment and the human body. It is essential for gasification slag (GS) to realize rational utilization. GS contains fewer combustible materials, and the high heating value is only 9.31 MJ/Kg, which is difficult to burn in combustion devices solely. The co-combustion behavior of the tri-fuel blends, including bituminous coal (BC), gasification slag (GS), and bamboo residue (BR), was observed by a thermogravimetric analyzer. The TGA results showed that the combustibility increased owing to the addition of BC and BR, and the ignition and burnout temperatures were lower than those of GS alone. The combustion characteristics of the blended samples became worse with the increase in the proportion of GS. The co-combustion process was divided into two main steps with obvious interactions (synergistic and antagonistic). The synergistic effect was mainly attributed to the catalysis of the ash-forming metals reserved with the three raw fuels and the diffusion of oxygen in the rich pore channels of GS. The combustion reaction of blending samples was dominated by O1 and D3 models. The activation energy of the blending combustion decreased compared to the individual combustion of GS. The analysis of the results in this paper can provide some theoretical guidance for the resource utilization of fine slag.

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Mechanical performance enhancement of recycled aggregate concrete using GGBS and fly ash for sustainable construction

Sarma,

Subhan Alisha,

Vijay

et al. 2023

Multiscale and Multidiscip. Model. Exp. and Des.

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Potential of Co-Fired Fly Ashes as a Construction Material – A Review

Cited by 5 publications

References 56 publications

Investigating the Hydration, Mechanical Properties, and Pozzolanic Activity of Cement Paste Containing Co-Combustion Fly Ash

Investigating the Hydration, Mechanical Properties, and Pozzolanic Activity of Cement Paste Containing Co-Combustion Fly Ash

Investigation of the Characteristics of Catalysis Synergy during Co-Combustion for Coal Gasification Fine Slag with Bituminous Coal and Bamboo Residue

Mechanical performance enhancement of recycled aggregate concrete using GGBS and fly ash for sustainable construction

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