Kaolin Case Study

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Shannag (2000)52 designed and studied very high compressive strength of 69 to 110 MPa along with incorporation of locally available natural pozzolana and silica fume. He concluded that 15% replacement of cement with silica fume along with 15% natural pozzolan gave relatively higher strength than without natural pozzolan. A.Shvarzman, K.Kovler, G.S.Grader G.E.Shter (2001)54 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 by the above authors. The process of dehydroxylation/amorphization of kaolinite were characterized by DTA/TGA with mass-spectrometry and x-ray…show more content…
They concluded that incorporation of Metakaolin up to 15% has increased the tensile and compressive strength and also peak strain is increased at increasing rate of Metakaolin up to 15%. Incorporation of Metakaolin has slightly increased the compressive elasticity modulus. Poon et al (2001)57 investigated the rate of pozzolanic reaction of Meta kaolin in high performance cement mortars. They studied the hydration progress of Metakaolin in terms of its compressive strength, porosity and pore size distribution. They concluded that the higher pozzolanic reactivity results in a higher rate on strength development and its pore structure refinement for the cement pastes at earlier…show more content…
(2003)67 the expansive behaviors of heat cured mortars containing pozzolans and slag was investigated by the authors. In almost all the mortars, the addition of any amount of pozzolans and slag to the mixture usually reduced the onset of expansion, the rate of expansion, and long-term expansion. However, the efficiency of a particular pozzolan (or) slag in controlling expansion may depend on its Al2O3 content. Metakaolin, which contains a higher amount of reactive Al2O3, was the most effective at controlling expansion at relatively low cement replacement levels. Slag and fly ash which are also sources of Al2O3 were also effective at suppressing expansion at higher replacement levels. Silica fume was less effective at controlling expansion at conventional replacement levels, and even at higher replacement levels expansion may be

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