SYNTHESIS AND FUNDAMENTAL PROPERTY OF 3CaO・CaCl₂・15H₂O RELATED TO CaCl₂ ATTACK

Abstract

3CaO・CaCl₂・15H₂O is the main factor for the chemical deterioration caused by CaCl₂. In this study, the method for the synthesis of 3CaO・CaCl₂・15H₂O was examined, and the fundamental property of synthetic single crystal was studied through a morphological analysis, X-ray diffraction（XRD）, and Thermogravimetric/Differential Thermal Analyzer（TG-DTA）. As a result, deposition process was found for the synthesis of 3CaO・CaCl₂・15H₂O. The synthetic sample is significantly unstable, and forms a needle-shaped crystal. The heat characteristics and chemical reactions accompanying of heating are explained. Additionally, it was shown that 3CaO・CaCl₂・15H₂O has a strong preferred orientation.