OPTIMIZATION OF THE PROPERTIES OF ALUMINOUS CEMENTS USING INORGANIC FILLERS

The carefully controlled addition of inorganic fillers to calcium sulfoaluminate rapid-setting cements can lead to significant improvement and optimization of its properties. Generally, prior art achieves cement optimization using costly and unstable organic additives. In the present invention, the addition of three inorganic additives such as coal ash, limestone or kiln dust led to appreciable improvement in the properties of calcium sulfoaluminate-containing cements. The addition of coal fly ash led to increased compressive strength and freeze-thaw durability while decreasing shrinkage and autoclave expansion. The addition of limestone was shown to control the compressive strength while not affecting the setting time, and the addition of cement kiln dust was shown to control the compressive strength while increasing the setting time. And finally, the presence of a super plasticizing agent was shown to negatively affect both compressive strength and shrinkage when used in combination with fly ash.