Heat capacity measurements of cement materials

Sasada, Yuto*; Miyazaki, Yuji*; Nakano, Motohiro*; Matsuo, Yusuke*; Walker, C.*; Sasamoto, Hiroshi ; Mihara, Morihiro

Cementitous materials are to be used in large quantities in the geological disposal of highly radioactive TRU waste. Thermodynamic data on cement hydrate minerals are important to model the long-term dissolution behavior of cement materials during the reaction of these materials with groundwater. Portlandite (Ca(OH) $_{2}$ ) is a major component (20 to 25 wt%) of hydrated Portland cement. Low temperature heat capacity measurements of three types of portlandite (low purity, high purity, and large crystal) showed purity dependence. The large crystal sample followed Debye's T $^{3}$ rule at low temperatures, while the high and low purity samples showed upturn of heat capacity, possibly due to difference in absorbed water vapor and/or calcite (CaCO $_{3}$ ) contamination. Heat capacities of the cement hydrates (ettringite:Ca $_{6}$ (Al(OH) $_{6}$ ) $_{2}$ (SO $_{4}$ ) $_{3}$ (H $_{2}$ O) $_{n}$ and monosulfate:Ca $_{4}$ Al $_{2}$ (OH) $_{12}$ (SO $_{4}$ )(H $_{2}$ O) $_{n}$ ) exhibited phase transitions associated with the hydration water.

Language	:	Japanese
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Meeting title	:	第58回熱測定討論会
Held date	:	2022/10
Location (city)	:	東京
Location (country)	:	日本
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Keywords	:	熱容量; セメント材料; ポルトランダイト; エトリンガイト; モノサルフェート
Research Facility	:	ENTRY(地層処分基盤研究施設)
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Article of JAEA R&D Review	:
Cooperating Institute	:	大阪大学大学院理学研究科

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Registration No. : BB20221047
JAEA Abstracts No. :
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