Influence of tricalcium aluminate on the microstructure evolution of CaO specimen during hydration

摘要

C(3)A-containing CaO specimen was prepared and the evolution of its microstructure during hydration process was investigated to clarify the protective mechanism of tricalcium aluminate (C(3)A) on hydration resistance of CaO specimen. The slit-shaped micropores were formed on the grain boundary of CaO due to the stacking of lamellar C(4)AH(13) formed by the hydration of C(3)A. The contact area of residual C(3)A with the moisture was reduced by the porous C(4)AH(13) layer at the original site, which resulted in a slower dissolution rate of C(3)A grain through the porous layer. In addition, the crack propagation and the formation of macropores were inhibited by the pinning effect of C(4)AH(13), which was beneficial to the improvement of hydration resistance.

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