化学外加剂对粉煤灰湿法细化活化的影响

doi:10.11896/cldb.22100005

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Abstract Fly ash (FA), used as mineral admixture, is one of the important means to reduce carbon emission of cementitious materials, but its low early activity is a common concern. In this study, chemical functional components were introduced in wet grinding process to improve the efficiency of FA refinement and activation. The physicochemical property and activity index were evaluated by PSD, pH, ICP, XRD, SEM and TG-DTG, and the synergistic mechanism of liquid lapping mechanical force and chemical dissolution was revealed. The results show that the introduction of TIPA, TEA, NaOH, Na₂SO₄ and carbide slag (CS) chemical functional components and optimization of liquid environment medium could significantly improve the wet grinding efficiency. When the median particle size of FA was reduced to 2 μm, TIPA+CS had the most significant effect; the grinding time was reduced from 120 min to 40 min, with a decrease by 67%. At 1 day age, Na₂SO₄ showed the most significant effect, and the activity index of FA reached 60.1%; at 3 d, 7 d and 28 d, TIPA+CS had a good effect, and the activity index reached 81.3%, 89.1% and 97%, respectively. In the process of wet grinding process, liquid environment medium could corrode the surface of fly ash, promote the depolymerization of [AlO₄] and [SiO₄] on the surface, accelerate ion dissolution, form hydration products such as ettringite and C-S-H gel, and significantly improve the efficiency of refinement and activation.

Key words： fly ash wet grinding the liquid phase environment admixture activity index

Published: 10 March 2024 Online: 2024-03-18

CLC number:

TU528

Fund:Key R & D Project of Hubei Province (2021BAA060).

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	Articles by authors
	TAN Hongbo
	KONG Xianghui
	HE Xingyang
	LI Maogao
	SU Ying
	JIAN Shouwei
	YANG Jin

Cite this article:

TAN Hongbo,KONG Xianghui,HE Xingyang, et al. Effect of Chemical Additives on Wet Grinding and Activation of Fly Ash[J]. Materials Reports, 2024, 38(5): 22100005-7.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.22100005 OR http://www.mater-rep.com/EN/Y2024/V38/I5/22100005

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