Effect of Different Calcium Resouces on Reaction Mechanism of Geopolymer

doi:10.11901/1005.3093.2015.558

Chinese Journal of Materials Research

2016, Vol. 30

Issue (5): 348-354 DOI: 10.11901/1005.3093.2015.558

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Effect of Different Calcium Resouces on Reaction Mechanism of Geopolymer

GUO Xiaolu^1,^2,^**(

), SHI Huisheng^1,², XIA Ming²

1. Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, Tongji University, Shanghai 201804, China
2. School of Materials Science and Engineering, Tongji University, Shanghai 201804, China

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GUO Xiaolu, SHI Huisheng, XIA Ming. Effect of Different Calcium Resouces on Reaction Mechanism of Geopolymer. Chinese Journal of Materials Research, 2016, 30(5): 348-354.

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Abstract

The reaction products of a system of geopolymer could be great different due to the variation of the chemical composition of raw materials and the activated conditions. In the system of geopolymer containing calcium, the reaction mechanism, composition of products, and their structures could be more complex. Metakaolin (MK)-based geopolymer was prepared from metakaolin with different amount of five kinds of crystal calcium resources and two kinds of non-crystal calcium sources. The effect of calcium resource on the performance and reaction mechanism of the geopolymer was then systematically studied. The result showed that the dissolution of Si and Al related to the structure of the calcium resources and had a strong positive correlation, but no clear relationship with Ca. The compressive strength of MK-based geopolymer could decrease by addition of calcium resources. The compressive strength of geopolymer with non-crystal calcium resource was higher than that with crystal one. The dessolved amount of calcium from the calcium resource had a negative connection with the compressive strength. It provided the theoretical and experimental base for broadening the raw material resources of geopolymer system, and for utilization of industrial solid wastes containing calcium.

Key words: Inorganic non-metallic materials geopolymer calcium metakaolin fly ash slag

Received: 30 September 2015

ZTFLH:

TQ172

Fund: *Supported by National Natural Science Foundation of China No.51478328

About author: **To whom correspondence should be addressed, Tel: (021)69582144, E-mail: guoxiaolu@tongji.edu.cn

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	Xiaolu GUO
	Huisheng SHI
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https://www.cjmr.org/EN/10.11901/1005.3093.2015.558 OR https://www.cjmr.org/EN/Y2016/V30/I5/348

Table 1 Chemical composition of MK, CFA and SL (%, mass fraction)

Table 2 Basic properties of silicate minerals containing calcium

Table 3 Chemical composition of silicate minerals containing calcium (%, mass fraction)

Table 4 Concentration of Ca, Si and Al from calcium resources in NaOH for 24 h (mg/L)

Table 5 Correlation analysis between dissolution of Si and Al from three calcium resources of silicate minerals with frame structure

Table 6 Correlation analysis of dissolution of Ca, Si and Al from external calcium resources

Fig.1 Effects of external calcium on the compressive strength of MK-based geopolymer. (a) 20% (mass fraction) external calcium, (b) 40% (mass fraction) external calcium

Table 7 Correlation analysis of the compressive strength and Ca dissolution from the external calcium dissolving for 24 h

Fig.2 XRD spectra of geopolymer samples with calcium resources at 28 d. (a) 20% (mass fraction) external calcium, (b) 40% (mass fraction) external calcium

Fig.3 Effects of calcium on the mechanism of geopolymer reaction

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