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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 m: 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.

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degree can be more easily determined and is calculated as the heat released at a certain moment Q ( t ) relative to the maximum heat release Q max [ 14 ]. Pane and Hansen [ 21 ] also affirmed the suitability of the method for blended cements. Moreover

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-5533.0000083 . 4. Tongsheng Z , Qijun Y , Jiangxiong W , Peng G , Pingping Z . Study on optimization of hydration process of blended cement . J Therm Anal Calorim . doi: 10.1007/s10973

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blended cements, impart similar behaviour to that of commercial metakaolin especially with respect to cement strength development, setting times and hydration as well as durability [ 32 ]. The similar kaolins with relatively poor kaolinite content are in

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Journal of Thermal Analysis and Calorimetry
Authors: Carolina Resmini Melo, Elidio Angioletto, Humberto Gracher Riella, Michael Peterson, Márcio Roberto Rocha, Aline Resmini Melo, Luciano Silva, and Susane Strugale

.02.009 . 11. Frías M , Rodrígues O , Vegas I , Vigil R . Properties of calcined clay waste and its influence on Blended cement . J Am Ceram Soc. 2008 . doi: 10.1111/j.1551-2916.2008.02289.x

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granulated blast-furnace slag on some properties of pastes, mortars, and concretes Frohnsdorff , G , eds. Blended cements, ASTM STP 897 . Philadelphia : American Society for Testing and Materials ; 1986 29 – 47 . 10.1520/STP36390S

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, Perraki , T , Tsivilis , S , Kakali , G . Zeolite blended cements: evaluation of their hydration rate by means of thermal analysis . J Therm Anal Calorim . 2009 ; 96 : 993 – 998 . 10.1007/s10973-009-0056-x . 9

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. Evju , C , Hansen , S . 2005 . The kinetics of ettringite formation and dilatation in a blended cement with beta-hemihydrate and anhydrite as calcium sulfate . Cem Concr Res . 35 12 2310 – 2321 10.1016/j.cemconres.2004

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157 – 164 10.1016/0008-8846(80)90072-1 . 8. Morsy , SM , Shebl , SS 2007 Effect of silica fume and metakaoline pozzolana on the performance of blended cement pastes against fire

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, E , Perraki , T , Tsivilis , S , Kakali , G 2009 Zeolite blended cements: evaluation of their hydration rate by means of thermal analysis . J Therm Anal Calorim 96 : 993 – 998 10.1007/s10973-009-0056-x

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