【摘 要】
：
In belite-barium calcium sulphoaluminate cement, C2.T5B1.25A3$ (2.75CaO·1.25BaO· 3Al2O3· SO3) is one of important minerals and governed directly the earl
【机 构】
：
Shandong Provincial Key Lab.of Preparation and Measurement of Building Materials, University of Jina
【出 处】
：
The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
In belite-barium calcium sulphoaluminate cement, C2.T5B1.25A3$ (2.75CaO·1.25BaO· 3Al2O3· SO3) is one of important minerals and governed directly the early-strength of cement.Due to the complexity of phase composition of the cement system, a binary system C2.75B1.25A3$-C2S is selected to investigate the formation of C2.75B1.25A3$ in this paper.In addition, the early age hydration characteristics of C2.75B1.25A3$ in the binary system is monitored by ESEM.In the range of 1100 ℃-1200 ℃, the earlier formed C2S hinders the formation of C2.75B1.25A3$ in binary system.On the contrary, when the temperature is in the range of 1200 ℃-1350 ℃, the primarily formed C2S could provide surface for the nucleation of C2.75B1.25A3$ and cut down the potential barrier (/Gk*) for the heterogeneous nucleation of C2.75B1.25A3$, which contributes to the formation of C2.75B1.25A3$.Moreover, at 1350 ℃, the large amount of previously formed C2S benefits the extent of formation of C2.75B1.25A3$.The possible reason was that it could prevent sulfur element from evaporation.In early hydration age, AFm and AFt originating from C2.75B1.25A3$ hydration are found within 2 h and 12 h under 95% RH at 1 ℃, respectively, whereas C2S is unhydrated at this moment.
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