Correlation analysis of various characteristics of fly ash based on particle separation AITranslate
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Highlights • Fly ash particles are separated according to particle size and apparent density. • 40 µm and 80 µm are the critical particle sizes for the change of glass phase content and microstructure. • 2.5 g·cm−3 is the critical apparent density for the change of phase composition. • Pozzolanic activity is determined together by alkaline oxides and acid oxides. Due to the diversity of fly ash particles, it is a scientific way to promote the comprehensive utilization of fly ash with high efficiency to sort and classify the particles. The correlation between sorting indices and various characteristics of fly ash is the theoretical basis for its separation and classified application. In this paper, fly ash from three different coal-fired power stations is separated according to particle size and apparent density. The composition, morphology, and pozzolanic activity of the separated fly ash particles were characterized by several test techniques including X-ray fluorescence, X-ray diffraction, polarized light microscopy, scanning electron microscopy and lime absorption test. The correlation laws between different characteristics common to three types of fly ash were analyzed. The results show that the alkaline oxide (CaO+MgO+K2O+Na2O) content of fly ash varies accordantly with particle size, apparent density, glass phase content and pozzolanic activity. 40 µm and 80 µm are the critical particle size for the obvious change of glass phase content and microstructure of fly ash particles, and 2.5 g·cm−3 is the critical apparent density for the change of phase composition. Pozzolanic activity is determined together by alkaline oxide content and acid oxide (SiO2 +Al2O3) content, and there is no obvious single factor relationship between pozzolanic activity and particle size or apparent density. Graphical Download : Download high-res image (195KB) Download : Download full-size image
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DOI：https://doi.org/10.1016/j.cscm.2023.e02785
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Highlights • Fly ash particles are separated according to particle size and apparent density. • 40 µm and 80 µm are the critical particle sizes for the change of glass phase content and microstructure. • 2.5 g·cm−3 is the critical apparent density for the change of phase composition. • Pozzolanic activity is determined together by alkaline oxides and acid oxides. Due to the diversity of fly ash particles, it is a scientific way to promote the comprehensive utilization of fly ash with high efficiency to sort and classify the particles. The correlation between sorting indices and various characteristics of fly ash is the theoretical basis for its separation and classified application. In this paper, fly ash from three different coal-fired power stations is separated according to particle size and apparent density. The composition, morphology, and pozzolanic activity of the separated fly ash particles were characterized by several test techniques including X-ray fluorescence, X-ray diffraction, polarized light microscopy, scanning electron microscopy and lime absorption test. The correlation laws between different characteristics common to three types of fly ash were analyzed. The results show that the alkaline oxide (CaO+MgO+K2O+Na2O) content of fly ash varies accordantly with particle size, apparent density, glass phase content and pozzolanic activity. 40 µm and 80 µm are the critical particle size for the obvious change of glass phase content and microstructure of fly ash particles, and 2.5 g·cm−3 is the critical apparent density for the change of phase composition. Pozzolanic activity is determined together by alkaline oxide content and acid oxide (SiO2 +Al2O3) content, and there is no obvious single factor relationship between pozzolanic activity and particle size or apparent density. Graphical Download : Download high-res image (195KB) Download : Download full-size image
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| GB/T 7714-2015 | [1] Shuxia Feng, Xiuzhi Zhang, Linglin Xu, et al. Case Studies in Construction Materials, 2024(20). DOI:10.1016/j.cscm.2023.e02785. |
| MLA | [1] Shuxia Feng, et al., Case Studies in Construction Materials, no. 20, 2024, https://doi.org/10.1016/j.cscm.2023.e02785. |
| APA | [1] Shuxia Feng, Xiuzhi Zhang, Linglin Xu, Wenhong Tao, & Guangbin Duan. (2024). Case Studies in Construction Materials(20). https://doi.org/10.1016/j.cscm.2023.e02785 |
| IEEE | [1] Shuxia Feng, Xiuzhi Zhang, Linglin Xu, Wenhong Tao, and Guangbin Duan, Case Studies in Construction Materials, no. 20, 2024, doi: 10.1016/j.cscm.2023.e02785. keywords: {Fly ash;Particle separation;Particle size;Apparent density;Pozzolanic activity} |