USE OF MICROAUTORADIOGRAPHY AND FLUORESCENT IN SITU HYBRIDIZATION FOR CHARACTERIZATION OF MICROBIAL ACTIVITY IN ACTIVATED SLUDGE

Synthetically prepared calcium aluminates such as CA, CA2, C12A7 (C = CaO, A =: A12O3) and their various combinations have been subjected to hydration in water for three days. SEM technique has been applied to study the microstructure of the hydrated phases. Attempts have also been made to investigate the role of crystal morphology of hydrated calcium aluminates towards strength development in refractory concrete. It has been observed that crystal morphology depends on rate of hydration and chemistry of calcium aluminate cement (CAC).