Characterization and pozzolanic activity of thermally treated zeolite |
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Authors: | Th Perraki G Kakali E Kontori |
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Institution: | (1) National Technical University of Athens, Min. Eng. Dept., 9 Heroon Polytechniou St., 15773 Athens, Greece;(2) National Technical University of Athens, Chem. Eng. Dept., Labs of Inorganic and Analytical Chemistry, 9 Heroon Polytechniou St., 15773 Athens, Greece;(3) 1National Technical University of Athens, Min. Eng. Dept, 9 Heroon Polytechniou St., 15773 Athens, Greece |
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Abstract: | Summary The pozzolanic reactivity of thermally treated zeolites was studied on the basis of the Chapelle test combined with X-ray
diffraction (XRD) and Fourier Transform (FTIR) spectroscopy, as well as thermogravimetric analysis (TG/DTG) and differential
thermal analysis (DTA). The raw zeolite samples are from the Pentalofos area, Thrace, NE Greece. Their main mineral constituent
is 'heulandite type-II', an intermediate type of the heulandite-clinoptilolite isomorphous series. Calcination of the samples
was carried out up to 400, 500, 600, 700 and 1000°C for 15 h. The changes were recorded using the above methods. The deformation
of the zeolite crystal lattice starts at about 400°C and proceeds as the temperature of thermal treatment rises. The thermal
treatment of zeolite at 400°C improves its pozzolanic reactivity and accelerates the reaction with Ca(OH)2. |
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Keywords: | zeolite pozzolanic activity calcination |
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