Formation Mechanism and its Pozzolanic Activity of Metakaolin

Abstract:

In this paper, the process of the transformation from kaolin to metakaolin was investigated. The kaolin was calcined at different temperatures and analyzed by Xray diffraction (XRD), Fourier transform infrared spectra (FTIR) and solid state nuclear magnetic resonance (NMR). The formation of metakaolin structure was based on the stacking polyhedrons changes, which originated from dehydroxylation of kaolinite. With increasing temperature, kaolin kept structure of kaolinite unchanged in the course of dehydroxylation and then structure of kaolinite transformed to metakaolin when the dehydroxylation was over. It was demonstrated that the essence of pozzolanic activity of metakaolin. The result revealed that the pozzolanic activity of metakaolin increased with increasing temperature at the range of 600~900 °C.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 620-623
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.620
• Online since: March 2014
• Authors: Mei Rong Wang, Ning Guo*, Pei Gang He, Jing Bo Yu, De Chang Jia
• Keywords: Dehydroxylation, Formation Mechanism, Metakaolin (MK), Pozzolanic Activity

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