The effect of dehydroxylation/amorphization degree on pozzolanic activity of kaolinite
The effect of heat treatment parameters on the dehydroxylation/amorphization process of the kaolinite-based materials such as natural and artificial kaolin clays with different amounts of amorphous phase (metakaolin) was investigated. The procedure for quantitative estimation of amorphous phase in the heat-treated kaolinite materials was developed. The process of dehydroxylation/amorphization of kaolinite was characterized by DTA/TGA with mass-spectrometry and X-ray powder diffraction. The influence of the heat treatment temperature and content of the amorphous phase on pozzolanic activity was studied. Finally, the relationships between the chemical activity, activity strength index and the amorphous phase content were found and discussed. The results obtained are important for an optimization of the process of the metakaolin large scale production and it's use as an active pozzolanic admixture.
- OSTI ID:
- 20658299
- Journal Information:
- Cement and Concrete Research, Vol. 33, Issue 3; Other Information: PII: S0008884602009754; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
- Country of Publication:
- United States
- Language:
- English
Similar Records
Density Functional Modeling of the Local Structure of Kaolinite Subjected to Thermal Dehydroxylation
Effects of the secondary minerals of the natural pozzolans on their pozzolanic activity