Analysis of thermal process of pozzolan production
Keywords:pozzolans, fired kaolin clay, metakaoline, thermal process, dehydroxilation
The objective of this study was evaluated the effect of heat treatment parameters on the pozzolanic activity of natural kaolin clays. The experimental design included three factors: kaolin type, temperature and time. Five types of Colombian kaolin clays were thermally treated from 400 to 1000 °C by 1, 2, and 3 hours. The raw materials and the products obtained were characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Differential Thermal / Thermo gravimetric Analysis (DTAJ TGA). The pozzolanic activity of thermally treated samples according to chemical and mechanical tests was investigated.
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