Effect of the Kaolin Particle Size on the Pozzolanic Behaviour of the Metakaolinite Produced |
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Authors: | M Kaloumenou E Badogiannis S Tsivilis G Kakali |
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Institution: | (1) Inorganic and Analytical Chemistry Laboratories, Chemical Engineering Department National Technical University of Athens, 9 Heroon Polytechniou St., 15773 Athens, Greece |
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Abstract: | This paper reports an investigation of the effect of the particle size of kaolin on its transformation to metakaolinite. Kaolin
from the island of Milos was either crushed or ground in order to produce four samples with different degrees of fineness
(residue at 500 μm: 0–71.8%). The samples were treated thermally under different conditions in order to determine the optimum
treatment conditions. The conversion of kaolinite to metakaolinite and the structural changes in the material during treatment
were investigated by means of TG and XRD, respectively. Each sample was incorporated into a type I cement, at 20% by mass
of cement, and the compressive strengths of the resulting blended cements were measured. It is concluded that the particle
size of the raw kaolin does not affect the thermal conversion or the pozzolanic activity of the material. The use of crushed
kaolin has many benefits since the furnace load can be increased, while the grinding process is needed only to reduce the
size of the metakaolinite particles.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | kaolin metakaolinite particle size pozzolanic behaviour TG thermal treatment XRD |
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