摘要：AbstractThis paper describes the synthesis of some nano-compounds such as SiO2, Al(OH)3and Ca(NO3)2which can be used in the preparation of nano β-C2S as well as nanoC4A3S¯. The preparation of β-C2S from nano-SiO2and Ca (NO3)2in comparison with traditional materials such as Ca(CH3COO)2, CaCO3and silica quartz fired at different temperature has been studied. Also,C4A3S¯, can be prepared from nano-materials such as Ca(NO3)2and Al(OH)3with pure gypsum in comparison with Ca(CH3COO)2, CaCO3and calcined Al2O3. The rate of formation of β-C2S andC4A3S¯, can be also studied after firing with chemical and XRD methods. These phases were obtained by crystallization processing at different temperatures. The formation of these phases was monitored by measuring the free lime and insoluble residue contents. The results showed that the extent of formation was found to be much higher with nano-materials as compared to those prepared in a conventional manner. The prepared belite phase from nano-silica and calcium nitrate reduces the temperature synthesis to 1150°C. Also the preparation ofC4A3S¯from nano Al(OH)3and Ca(NO3)2and pure gypsum fired at 1290°C,was the perfect composition to produced a well formed calcium sulfoaluminate phase in comparison with traditional materials.
