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- W2072753807 abstract "Freezing phenomena in hardened cement paste (hcp) were investigated by DTA. On cooling at least two phase transitions have been observed in the temperature range betwenn -10°C and -25°C and near -43°C respectively. Also a hysteresis between cooling and heating has been found. The phase transitions are correlated to the radius of the water-filled pores and so to relative humidity and water content. Comparable results were obtained in different kinds of hcp. These findings can be explained by the specific properties of water in porous systems induced by surface interaction. Beim Abkühlen feichter Zementste inproben ergeben sich im wesentlichen zwei unterschiedliche Phasenübergänge. Mit steigendem Wassergehalt erscheint zunächst ein Peak um -43°C ab 60% r.F.; ein weiterer erscheint ab 90% r.F. bei -25°C, dessen Gröβe bei weiterer Wasseraufnahme wächst und dessen Lage sich bis -10°C verschiebt. Messungen an verschiedenen Zementsteinorten ergeben vergleichbare Resultate. Man kann daraus schliessen, daβ diese Effekte den Eigenschaften des Wassers im Einfluβbereich von Festkörperoberflächen zuzuschreiben ist." @default.
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- W2072753807 date "1979-11-01" @default.
- W2072753807 modified "2023-09-26" @default.
- W2072753807 title "Untersuchung von gefriervorgǎngen in zementstein mit hilfe der DTA." @default.
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- W2072753807 doi "https://doi.org/10.1016/0008-8846(79)90074-7" @default.
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