凝灰岩石粉在复合胶凝材料中的火山灰活性及水化性能评估

doi:10.11896/cldb.22040394

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Abstract To respond to the “carbon peak, carbon neutral” strategy and realize the green and sustainable development of the cement industry, it is proposed to study the mechanism of the hydration effect on cement-based materials when tuff powder is used as supplementary cementitious material to replace part of cement. Through the research, we hope to promote the application of tuff powder in a practical project. In this work,a comparative study was carried out using granite powder, fly ash and tuff powder. The pozzolanic reactivity was evaluated by the pozzolanic reactivity index method, and then the strength and hydration development of cement-powder and cement-fly ash composite system were studied by compressive strength test and microscopic analysis means such as X-ray diffraction (XRD), thermogravimetry-differential thermal analysis (TG-DTA) and scanning electron microscope (SEM). Finally, greenhouse gas emissions were assessed. The results showed that tuff powder had a weak pozzolanic reactivity. Specifically, its pozzolanic reactivity index was 52.5%, which was less than 65%. In general, it cannot be directly used as natural volcanic ash material for cement mortar and concrete. Tuff powder in cementitious materials will play the role of crystal nucleation, which can promote the early hydration of cement. The strength of nucleation effect was related to the fineness of the powder, and the smaller tuff powder had a stronger role in promoting hydration than the granite powder with a larger fineness. From the results of chemically bound water analysis, it was concluded that the hydration degree of tuff powder-cement composite system and fly ash-cement composite system was the same when the addition amount of mineral admixture was 20%, influenced by the nucleation effect and pozzolanic reactivity of tuff powder.

Key words： tuff power fly ash granite power green and sustainable development cement-based materials

Published: 25 August 2022 Online: 2022-08-29

CLC number:

TU528

Fund:National Key R & D Program of China (2021YFB2601000), the National Natural Science Foundation of China (52178185) and the Fellowship of China Postdoctoral Science Foundation (2021MD703885).

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	Articles by authors
	WANG Xuhao
	HOU Xin
	GAN Long
	WANG Yuan
	BIAN Qinghua
	ZHANG Jiupeng

Cite this article:

WANG Xuhao,HOU Xin,GAN Long, et al. Pozzolanic Reactivity and Hydration Properties Assessment of Tuff Powder in Composite Cementitious Materials[J]. Materials Reports, 2022, 36(16): 22040394-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22040394 OR http://www.mater-rep.com/EN/Y2022/V36/I16/22040394

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