水熱法によるCaCO_3の固化

概要

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The possibility of the solidification of CaCO_3 with saving energy consumption was discussed in the system CaCO_3-CaO-SiO_2 (88.2 : 1.8 : 10.0 mass%). Two kinds of bodies- "calcimation system" where CaO was supplied from partially calcined CaCO_3 at 800℃ for 3h and "addition system" where CaO was added- were prepared and hydrothermally processed under the saturated vapor pressure at 150-200℃ for 2-10h. In the calcination system, flexural strength of the body cured at 150℃ for 10h or at 200℃ for 5h showed 9 MPa which was three times higher than that in the addition system. The strength was controlled by the formed fibrous or lath-like C-S-H gels and C-S-H gels in the calcination system gave larger volume and more uniform distribution than in the addition system. Some parts of C-S-H gels were formed from CaCO_3 and 13% of CaCO_3 was observed to react in the calcination system at 150℃ for 10h or at 200℃ for 5h curing.
社団法人日本セラミックス協会の論文
1997-08-01