低质高碳粉煤灰制备粉煤灰贝利特水泥及其特性研究

doi:10.11896/j.issn.1005-023X.2017.024.007

Abstract
Figure/Table
References
Related Citation (7)

Download:

Full Text ( PDF ) (639KB)
Export: BibTeX | EndNote (RIS)

Abstract Stockpiled fly ash with high carbon-content and low reactivity was used to prepare belite cement by hydrothermal treatment followed by low temperature calcination. The effects of CaO content of starting mixture, hydrothermal treatment time at 97 ℃±2 ℃, calcination temperature and durating time on the composition of the precursor and clinker, and on the properties of the fly ash belite cement were investigated. The results show that the mullite and quartz in fly ash nearly do not take part in the reactions during hydrothermal treatment at 97 ℃±2 ℃ and calcination at 800 ℃. The main hydraulic minerals in the belite cement clinker are α’_L-C₂S and C₁₂A₇ when the clinker was calcined at 800 ℃, while β-C₂S and gehlenite exist when the clinker was calcined at 900 ℃ or higher temperature. Fly ash belite cement with the compressive strength as high as 30.2 MPa at 28 d was prepared from mixture with the CaO content of 30%, by hydrothermal treatment at 97 ℃ for 10 h followed by calcination at 800 ℃ for 1 h. Fly ash belite cement is characterized by rapid setting, which makes it suitable for rush-repairing project, however, high water requirement which result in looser microstructure and higher porosity of the hardened cement paste.

Key words： fly-ash belite cement hydrothermal synthesis low temperature calcination

Published: 08 May 2018

CLC number:

TQ172.1

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	DU Chao
	LIU Fei
	WAN Yuanyuan
	GONG Yongfan
	FANG Yonghao

Cite this article:

DU Chao,LIU Fei,WAN Yuanyuan, et al. Preparation of Fly Ash Belite Cement from High-carbon Low-quality Fly Ash and Its Properties[J]. Materials Reports, 2017, 31(24): 30-34.

URL:

http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.024.007 OR http://www.mater-rep.com/EN/Y2017/V31/I24/30

1 http://www.chinabgao.com/stat/stats/45364.html.
2 Fang Yonghao, Cheng Liqing, Gong Yongfan, et al. Development and future of fly ash belite cement[J]. J Chin Ceram Soc, 2015,43(2):165(in Chinese).
方永浩,承礼清,龚泳帆,等. 粉煤灰贝利特水泥的研究现状与前景[J].硅酸盐学报,2015,43(2):165.
3 Mccarthy M J, Jones M R, Zheng L, et al. Characterising long-term wet-stored fly ash following carbon and particle size separation[J]. Fuel, 2013,111:430.
4 Zhao Jihui, Wang Dongmin, Wang Xueguang, et al. Ultrafine grinding of fly ash with grinding aids: Impact on particle characteristics of ultrafine fly ash and properties of blended cement containing ultrafine fly ash[J]. Constr Build Mater, 2015,78:250.
5 Han Fanghui, Wang Qiang, Feng Jingjing. Differences among the roles of ground fly ash in the paste, mortar and concrete[J]. Constr Build Mater, 2015,93:172.
6 Rabah H, Othmane B, Sofiane G,et al. The sequel of modified fly ashes using high energy ball milling on mechanical performance of substituted past cement[J]. Mater Des,2016,90:29.
7 Yan Xiaomin. Study of performance of efficient activated fly ash and its developing[J]. Fly Ash, 2013(4):7(in Chinese).
颜晓敏.高效活化粉煤灰的研制及其性能研究[J]. 粉煤灰,2013(4):7.
8 Ming Panrong, Yang Nanru, Zhong Baiqian, et al. Special low-lime fly ash cement[C]// Proc1985 Beijing Int Symp Cem Concr. Beijing: China Building Industry Press, 1985:444.
9 Pimraksa K, Hanjitsuwan S, Chindaprasirt P. Synthesis of belite cement from lignite fly ash[J]. Ceram Int, 2009, 35(6):2415.
10Kacimi L, Cyr M, Clastres P. Synthesis of α’_L-C₂S cement from fly-ash using the hydrothermal method at low temperature and atmospheric pressure[J]. J Hazard Mater, 2010,181(1-3):593.
11Guerrero A, Go I S, Mac A S A, et al. Mechanical properties, pore size distribution, and pore solution of fly ash-belite cement mortars[J]. Cem Concr Res, 1999,29(11):1753.
12Jiang W M, Roy D M. Hydrothermal processing of new fly ash cement[J]. Ceram Bull, 1997,71(4):642.
13Go I S, Guerrero A, Lux N M P, et al. Activation of the fly ash pozzolanic reaction by hydrothermal conditions[J]. Cem Concr Res, 2003,33(7):1399.
14Guerrero A, Go I S, Campillo I, et al. Belite cement clinker from coal fly ash of high Ca content. Optimization of synthesis parameters[J]. Environ Sci Technol,2004,38(11):3209.
15Go I S, Guerrero A. SEM/EDX characterization of the hydration products of belite cements from class C coal fly ash[J]. J Am Ceram Soc, 2007,90(12):3915.
16Guerrer O A, Go I S, Moragues A, et al. Microstructure and mechanical performance of belite cements from high calcium coal fly ash[J]. J Am Ceram Soc,2005,88(7):1845.
17Go I S, Guerrero A. Hydraulic activity of belite cement from class C coal fly ash. Effect of curing and admixtures[J]. Mater Constr, 2006,56(283):61.