High Temperature Cracking Damage of Calcium Aluminate Cements

摘要

Different formulations of calcium aluminate cements (CAC) with 51 and 71 wt% Al_2O_3, have been exposed to high temperature oxidation environments. Cement paste samples of 0.25, 0.30, and 0.40 water to cement (W/C) ratios were fabricated in this research. Both the raw cement powders and their corresponding samples after hydration were characterized in their microstructure by scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy and x-ray fluorescence. Samples were exposed to 500, 800 and 1000°C in a furnace open to air. Damage occurred while samples were in the furnaces. Damage was analyzed by digital image processing.