Abstract
It has been recognized that the hydration behavior of Belite depends on the amount of Alite being coexistence with Belite, the curing temperature and the ionic concentration of leached calcium in pore solution. To understand these crucial factors on the hydration behavior of Belite, X-ray diffraction（XRD）and Rietveld analysis are carried out to quantify the hydration degree of Alite, Belite, and other cement hydrates. From the result obtained in this study, it is found that the amount of Alite has an influence on the hydration behavior of Belite；hydration degree of Belite decreases with increase in the amount of Alite. Furthermore, curing temperature（less than 50℃）does not have an affect the hydration behavior of α dicalcium silicate（α-C2S）but the hydration behavior of β dicalcium silicate（β-C2S）has temperature dependency. At high water to cement ratio of 10,000 percent, the ionic concentration of calcium in pore solution remains very low, and it brings about that the hydration degree of Alite stops at around 80％ and the induction period is disappeared；however, there is no significant different on the hydration behavior of β-C2S from that at water to cement ratio of 50％. Therefore it might be concluded that the hydration behavior of β-C2S is not affected by the ionic concentration of calcium in pore solution.
