Pozzolanic reactivity of fly ash – API method and K-value

Yamamoto, Takakazu; Kanazu, Tsutomu; Nambu, Mitsuhiro; Tanosaki, Takao

doi:10.1016/j.fuel.2006.01.034

Cited by 27 publications

(8 citation statements)

References 8 publications

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“…[2][3][4]. Based on the composition characteristics of fly ash, it has pozzolanic activity [5][6][7][8][9][10]. For a long time, fly ash as a supplementary cementitious material was widely used in the cement and concrete industries.…”

Section: Introductionmentioning

confidence: 99%

Ultrafine grinding of fly ash with grinding aids: Impact on particle characteristics of ultrafine fly ash and properties of blended cement containing ultrafine fly ash

Zhao

Wang

et al. 2015

Construction and Building Materials

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Section: Introductionmentioning

confidence: 99%

Ultrafine grinding of fly ash with grinding aids: Impact on particle characteristics of ultrafine fly ash and properties of blended cement containing ultrafine fly ash

Zhao

Wang

et al. 2015

Construction and Building Materials

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“…The pozzolanic properties of PC ashes have been considered in many literatures [1][2][3][4][5][6][7][8][9][10][11][12][13][14] ，and some of them dealed with the pozzolanic reactivity and hydration kinetics. Cheriaf et al [1] investigated pulverized bottom ashes from pulverized coal combustion boiler based on the strength activity index.…”

Section: Introductionmentioning

confidence: 99%

Pozzolanic reaction kinetics of coal ashes

Zheng

Wang

Qian

et al. 2009

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The pozzolanic reactivity was determined by the hydration kinetics of pozzolanic reaction based on the fact that the hydration products of active SiO 2 and Al 2 O 3 with lime were soluble in dilute hydrochloric acid. The results show that the pozzolanic reaction of active SiO 2 and Al 2 O 3 of coal ashes follows apparent first-order kinetics. The reaction rate constant of FBC ashes is greater than that of PC ashes, while the activation energy of the former is lower than that of the latter. It is confirmed that the pozzolanic activity of fluidized bed combustion(FBC) ashes is significantly higher than that of PC ashes, and the reaction barrier of the former is lower than that of the latter, because the microstructures of FBC ashes, such as mineralogical composition, morphology and polymerization degree of [SiO 4 ] and [AlO 6 ] are more favorable to the pozzolanic activity development than those of PC ashes.

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“…If fly ash contains a higher amount of reactive silica, with higher specific surface area and lower particle size distribution, the mechanical strength of the fly ash mortar would reach higher values. In recent years, some researchers to improve their pozzolanic reactivity, various methods have been investigated different methods [11][12][13], such as activation [14], alkali activation [15], and sulfate activation [16]. However, this kind of treatment methods is expensive and poor durability.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Activation of Fly Ash: Physical, Mineralogical and Morphological Characterization of Ground Fly Ashes

Dikmen¹,

Dikmen²,

Yilmaz

et al. 2019

Eskişehir Technical University Journal of Science and Technology a - Applied Sciences and Engineering

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In this study, physical, mineralogical and morphological characteristics of mechanically treated fly ashes are investigated. The compositional analysis of the raw fly ash was determined using X-ray fluorescence (XRF) technique. The XRD patterns reveal that the main phase quartz along with mullite and anhydrite. The raw fly ash was also wet ground using a laboratory mill, for several different times (from 2 to 16 hours) in order to examine how the grinding increases the activity of the fly ash. The ground fly ash was characterized for (i) particle size distribution: laser diffraction method, (ii) specific surface area: BETmethod, (iii) crystalline structure: X-ray diffractometer, and (iv) morphology of particles: scanning electron microscope. According to physical characterization, fineness increasing of samples with grinding time was observed, but loss of effectiveness occurred for grinding time longer than 12 hours. In addition, the unmilled fly ash showed lower specific surface area, due to the presence of cenospheres in the original fly ash. Only a little change in crystalline structure of fly ashes was observed when grinding and there were changes in the area and height of each diffraction peak.

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Pozzolanic reactivity of fly ash – API method and K-value

Cited by 27 publications

References 8 publications

Ultrafine grinding of fly ash with grinding aids: Impact on particle characteristics of ultrafine fly ash and properties of blended cement containing ultrafine fly ash

Ultrafine grinding of fly ash with grinding aids: Impact on particle characteristics of ultrafine fly ash and properties of blended cement containing ultrafine fly ash

Pozzolanic reaction kinetics of coal ashes

Mechanical Activation of Fly Ash: Physical, Mineralogical and Morphological Characterization of Ground Fly Ashes

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