2011 Volume 65 Issue 1 Pages 69-75
For the creation of the recycling society, it is necessary to figure out the hydration behavior of the aluminate phase in detail. To achieve the objective, hydration of the aluminate phase in the cement paste using white cement was investigated. Especially, calcium aluminate hydrate（C-A-H）which is an amorphous phase was examined in this research. Judging from the mass balance of aluminum which it considered from results of Powder X-ray Diffraction（XRD）/Rietveld analysis, Thermogravimetry-Differential Thermal Analysis（TG-DTA）and Differential Scanning calorimetry（DSC）, it was confirmed that quantity of aluminum present in C-A-H increased in case of high curing temperature. In addition, when it applied a kinetic model of calcium aluminate cement of the past research to aluminate phase in the cement paste, it was shown that application to the first peak was possible and reaction coefficients has temperature dependency. On the other hand, there was room of examination about application to the second and third peaks. Furthermore, it was guessed that the stagnation of the hydration of the first peak was caused by the fact that C-A-H was generated by the aluminate phase outer layer, and inhibition of mass transfer is caused by amount of C-A-H increased in case of high curing temperature.
