弱碱激发超细粉煤灰水化产物结构分析

doi:10.11896/cldb.18050225

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Abstract Mechanochemistry can enhance the activity of ultra-fine fly ash and endows it with better activation potential in weak alkalis. The impact of calcium carbide slag on the activation products of ultra-fine fly ash (D50=2.5 μm) was studied, and the activation products of sodium hydroxide were taken into comparison. Specifically, the phase composition of hydration products of the fly ash activated by different matters, the dissolution characteristics of ions in the system and the variation of the polymerization degree of the glass phase in the fly ash were tested and analyzed by means of XRD, TEM, ICP and NMR. It could be found from the results that early hydration reaction of ultra-fine fly ash had occurred in the wet grinding process (6 h), reflected by obvious product peaks of ettringite and hydrocalumite (Ca₂Al(OH)₇·3H₂O) in XRD patterns. The results of XRD, TEM and ICP analyses indicated the increase in diversity of the hydration products of ultra-fine fly ash activated by calcium carbide slag, as well as the dense structure of the products. Under the activation of NaOH, zeolites products were generated from ultra-fine fly ash, accompanied by less ettringite hydration products. The results of NMR test showed that the structure of the silica polyhedron network in fly ash varied from high poly state to low poly state. More active ingredients in the system were activated and participated in the early hydration reaction.

Key words： ultra-fine fly ash activated by weak alkali calcium carbide residue sodium hydroxide hydration products

Published: 19 June 2019

CLC number:

TU560.2520

Fund:This work was financially supported by the Technology Innovation Special Program of Hubei Province (2018AAA002).

About author:: Science and Technology Commission (one project), and major projects of science and technology innovation in Hubei Pro-vince (two projects). As a team leader, his group had been selected as Wuhan High-tech Industry Innovation Team. He has published 25 SCI papers (1 ESI high cited), authorized 50 invention patents, published 2 monographs, responsible and participated in the compilation of 1 industry standard, twice won the 1st rank of Hubei Province Technical Invention Prize (ranked 1st, 5th), won the 1st rank of Hubei Province Teaching Achievement Award (ranked 3rd) and other provincial awards.Ying Su, master instructor of Hubei University of Technology. She graduated from the China Building Mate-rials Science Research Institute in 2005. She has mainly engaged in the utilization of solid waste resources and research on new building materials, and she has presided over more than 10 provincial and ministerial level projects such as the National Natural Science Foundation of China and the Science and Technology Support Program of Hubei Province. She has published more than 30 papers, authorized more than 50 invention patents, published 2 mo-nographs, participated in the compilation of 1 national standard; and twice won 1st rank of Hubei Province Technical Invention Prizes.Xingyang He, Ph.D. tutor of Hubei University of Technology. He had been selected in New Century High-level Talent Project of Hubei Province (second level) and Outstanding Young Talents Program of Hubei Province. He has Mainly engaged in the research on new waterproof materials and durability of engineering structures, and he has hosted national natural science funds (three projects), innovation project of National Defense

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	SU Ying
	QIU Huiqiong
	HE Xingyang
	YANG Jin
	WANG Yingbin
	ZENG Sanhai
	Bohumír Strnadel

Cite this article:

SU Ying,QIU Huiqiong,HE Xingyang, et al. Structure Analysis on Hydration Products of Ultra-fine Fly Ash Activated by Weak Alkali[J]. Materials Reports, 2019, 33(14): 2376-2380.

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http://www.mater-rep.com/EN/10.11896/cldb.18050225 OR http://www.mater-rep.com/EN/Y2019/V33/I14/2376

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