Liquid-solid grinding system: Grinding kinetics of coal fly ash as ultrafine supplementary cementitious materials--颗粒学报PARTICUOLOGY

Yang, J., Huang, Y., He, X., Su, Y., Huang, T., & Strnadel, B. (2024). Liquid-solid grinding system: Grinding kinetics of coal fly ash as ultrafine supplementary cementitious materials. Particuology, 94, 109-119. https://doi.org/10.1016/j.partic.2024.07.022

Liquid-solid grinding system: Grinding kinetics of coal fly ash as ultrafine supplementary cementitious materials

Jin Yang^{a b}, Yong Huang^a, Xingyang He^{a b *}, Ying Su^{a b}, Tao Huang^a *, Bohumír Strnadel^{a c}

a School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, 430068, China
b Building Waterproof Engineering and Technology Research Center of Hubei Province, Hubei University of Technology, Wuhan, 430068, China
c Center of Advanced Innovation Technologies, VŠB-Technical University of Ostrava, 708 33 Ostrava-Poruba, Czech Republic

10.1016/j.partic.2024.07.022

Volume 94, November 2024, Pages 109-119

Received 14 May 2024, Revised 26 July 2024, Accepted 30 July 2024, Available online 6 August 2024, Version of Record 13 August 2024.

E-mail: hexycn@163.com; httcmwh@hbut.edu.cn

Highlights

• A wet-milling kinetics of fly ash is studied.

• Wet-milling process of fly ash follows well with Divas-Aliavden equation.

• Evolution process of PSD is consistent with the Rosin-Rammler-Bennet distribution.

• Influence of particle characteristic parameters on activity index are analyzed.

• Effect of different particle sizes and characteristic particle size on activity index are conducted.

Abstract

Wet-milling in liquid-solid system can achieve ultra-fine mechanical dissociation of solid wastes with low energy consumption, thereby efficiently improving the potential pozzolanic reactivity. However, the wet-milling kinetics of ultrafine dissociation in liquid-solid system has not been fully investigated. This paper systematically investigates the wet-milling kinetics of fly ash (FA). Results showed that before wet-milling of FA for 360 min, no agglomeration effect was observed. The particle dissociation of FA during wet-milling can be divided into three stages: rapid dissociation, slow dissociation and stabilization. The evolution process of particle size distribution during wet-milling is consistent with the Rosin-Rammler-Bennet distribution. Both the particle uniformity coefficient and fractal dimension showed highly positive linear correlation with the strength activity index of wet-milled FA. The grey correlation analysis showed that FA particles between 1.1 and 3.1 μm had the greatest impact on both the early and late strength activity index. Simultaneously, D₁₀ of wet-milled FA has the largest impact on strength activity index at each age, while D₁₀₀ has the least impact. Therefore, D₁₀ and proportion of particles in 1.1–3.1 μm can be an important basis for judging the reactivity of wet-milled FA as ultrafine supplementary cementitious materials.

Graphical abstract

Keywords

Wet-milling; Liquid-solid system; Grey correlational analysis; Fly ash; Ultrafine supplementary cementitious materials

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