2011 Volume 65 Issue 1 Pages 190-195
The use of industrial waste as a raw material for the production of cement is expanding. However, it causes increased C3A content in cement. On the other hand, in order to prevent thermal cracking of concrete, it will become increasingly important to control the adiabatic temperature rise. The hydration property under adiabatic temperature rise has hardly researched experimentally. In this study, for high C3A cement cured under adiabatic temperature rise, the ratio of reaction of each clinker mineral was compared with that under the normal temperature cure, and the hydration property was evaluated. These results indicated that heat of hydration of cement used clinker with 12％ C3A was higher than that of cement used clinker with 10％ C3A in JIS R5203. On the other hand, the ultimate adiabatic temperature rise of these samples was not very different, and both of the heat of hydration calculated from the temperature rise was similar. Then the rate of reaction of each clinker mineral was evaluated. These results indicated that the rate of reaction of C3A cured under adiabatic temperature rise decreased compared with that the under normal temperature cure. In addition, when C3A content in clinker increased, the rate of the reaction was lower. Therefore, it was thought that the adiabatic temperature of the cement used clinker with 12％ of C3A did not rise significantly.
