Paper Title:
Alkali-Activation Reactivity and Al Environment of Chemosynthetic Al2O3–2SiO2 Powders
  Abstract

In this study, pure Al2O3-2SiO2 powders for a geopolymer were prepared by a sol-gel method, alkali-activation tests and alkali-dissolvability of the powders were carried out, and structure of the powders and alkali-activated products was investigated by 29Si and 27Al MAS NMR and SEM. Results showed that higher alkali-activation reactivity (higher compressive strengths of alkali-activated products) appeared in the powders heat-treated between 600-800 °C and alkali-dissolvability trend was different from that of alkali-activation tests. There were clear correlations between microstructure of alkali-activated products and alkali-activation reactivity and Al environment of the powders. It was found that high strength was related to a dense, fine grained microstructure. Such a structure was found in the alkali-activated products synthesized with the powders with high 5-coordinated Al contents. In addition, the peaks attributed to 5-coordinated Al were strengthened with the rise of heat-treated temperature of the powders.

  Info
Periodical
Advanced Materials Research (Volumes 79-82)
Edited by
Yansheng Yin and Xin Wang
Pages
2079-2082
DOI
10.4028/www.scientific.net/AMR.79-82.2079
Citation
G. J. Zheng, X. M. Cui, W. P. Zhang, Z. F. Tong, "Alkali-Activation Reactivity and Al Environment of Chemosynthetic Al2O3–2SiO2 Powders", Advanced Materials Research, Vols. 79-82, pp. 2079-2082, 2009
Online since
August 2009
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