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Alumina cement which was used in this investigation contains about 56% of Al 2 O 3  in the component. Early compressive strength alumina cement at 1 and 3 days can be achieved of 85% compressive strength value at 28 days. After a long period of hydration, the compressive strength of alumina cement harder decreased due to the releasing process of aluminum hydroxide [Al(OH) 3 ] to the outside environment [1, 4,11]. To improve and maintain the long lasting compressive strength of alumina cement harden, new binders would be created SiO 2 - Al 2 O 3  and among CaO-SiO 2 -Al 2 O 3 . The new binders would exist sustainably in the cement harden as a result of the chemical reaction between the product of hydrated cement called gel [Al(OH) 3 ] with micro silica (amorphous SiO 2 ) [4]. This report demonstrates the result of the investigation which is about the effect of silica fume and fly ash on alumina cement.

Effects of silicafume and fly ash on properties of alumina cement