用于地聚合物的粉煤灰活性评价研究

doi:10.11896/cldb.21010007

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Abstract Due to the heterogeneity of fly ash, it is difficult to anticipate the potential reactivity of fly ash. The leaching process of different fly ash under different conditions of time, temperature and alkali concentration (fly ash is first dissolved in lye, and its residue is dissociated in acid solution) . Inductively Coupled Plasma Optical Emission Spectrometer(ICP-OES) and chemical analysis results show that temperature, reaction time and alkali concentration all affect the dissolution rate and leaching content of fly ash. The leaching reactive n(Si)/n(Al) of fly ash was 2.3—2.7, and the total leaching amount of silica and aluminum from fly ash was positively correlated with the strength of geopolymers. It is found that the grading of fly ash used in cement system is not completely applicable to geopolymer system. XRD, FTIR and SEM analysis results show that fly ash is composed of reactive parts and inert parts. The active substances dissolve rapidly in the alkali dissolution process, the acid completely dissociates the gel formed during the geo-polymerization process, and the leaching process can more accurately characterize the content of reactive substances in fly ash. Therefore, alkali-acid combined determination method can be used to quantitatively estimate the reactant content and reactive n(Si)/n(Al) of fly ash, to simply and rapidly predict the potential reactivity of fly ash used in geopolymer systems, and to design the fly ash-based geopolymer.

Key words： fly ash geopolymer activity dissociation compressive strength

Published: 25 January 2022 Online: 2022-01-26

CLC number:

TU528

Fund:Opening Project of State Key Laboratory of Green Building Materials (0211002402028) and Chongqing Graduate Student Research Innovation Project (CYS18003).

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	Articles by authors
	LIU Xin
	TIAN Yixuan
	HUANG Jinfeng
	WAN Chengming
	YANG Hongyu
	WAN Chaojun

Cite this article:

LIU Xin,TIAN Yixuan,HUANG Jinfeng, et al. Investigation on Potential Reactive Evaluation of Fly Ash for Geopolymer[J]. Materials Reports, 2022, 36(2): 21010007-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21010007 OR http://www.mater-rep.com/EN/Y2022/V36/I2/21010007

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