الفهرس 
ABSTRACT
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Abstract
Recently, There is an energy crisis in Egypt. The Portland cement industry is a highly energy intensive process requiring about 112 K.w of energy-per ton of finished product. In order to reduce energy consumption, the efforts should be made to produce blended cements, comprised of supplementary cementitious materials such as silica fume, metakaolin, natural pozzolan, fly ash and limestone. In recent years worldwide, metakaolin (MK) has been studied because of its high pozzolanic properties. MK is obtained by the calcination of kaolinite. The raw material input in the manufacture of MK is kaolin. Although Egypt have a large reserve of kaolin however, MK is not widely produced and used due to the lack of adequate experiments on this material.