Thermodynamic Prediction of Calcium Aluminate Cement Paste
บทคัดย่อ
Calcium Aluminate Cement (CAC) is widely used in civil engineering application for some time. Research per thermodynamic prediction shows that the dissolution and nucleation behaviors reflect the ion concentration of the CAC system in solution. This study presents a theoretical prediction of calcium and aluminate ion concentrations of CAC system on dissolution and nucleation behavior, induction time (tind), interfacial free energy (γ), and crystal growth mechanism. Such data can influence the early-age hydration of CAC. Better understanding of the data is applied to predict and manipulate its early-age hydration. It is well understood that at 20ºC the CAC compositions of CaAl2O4·10H2O (CAH10) and Ca2Al2O5·8H2O (C2AH2) were the main hydrated products. Results in the study indicated that the nucleation of calcium phase was the controlling nucleation mechanism, not the aluminate.
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