Joint studies of water phase transitions in Na-bentonite clay by calorimetric and dielectric methods : научное издание

Mironov V.L.; Karavayskiy A.Y.; Lukin Y.I.; Pogoreltsev E.I.

Дополнительные ссылки: РИНЦ

База данных: Каталог библиотеки СФУ

Библиографическое описание: Joint studies of water phase transitions in Na-bentonite clay by calorimetric and dielectric methods : научное издание / V. L. Mironov [et al.]. - Текст : непосредственный // Cold Regions Science and Technology. - 2018. - Т. 153, № . - P. 172-180. - ISSN 0165-232X. - ISSN 1872-7441, DOI 10.1016/j.coldregions.2018.04.010.

Аннотация: The present study consisted of an experimental investigation of phase transitions of soil water contained in moist Na-bentonite clay, using the differential scanning calorimetry (DSC) method, within the temperature range from −40 to 20 °C. Based on the results of DSC analysis, the following components of soil water were found in the frozen bentonite: non-freezing water, unfrozen water and ice. The proposed method of processing the obtained experimental calorimetric data allowed us to determine the temperature dependencies of the content of particular soil water components. Latent heat of fusion was found in two cases, namely: where the ice was transformed into bound or unbound unfrozen soil water. The results of the investigation into phase transitions, obtained via calorimetric measurements, were used to substantiate the method for studying the phase transitions of soil water by dielectric measurements. With this in mind, complex relative permittivity testing was conducted on the same moist Na-bentonite clay, in the temperature range from −30 to 0 °C and a gravimetric moisture range from the dry soil to 1 g/g. Based on the results of these dielectric tests and a refractive dielectric mixture model (RDMM), the following components of water were identified in the frozen soil: tightly bound water, loosely bound water, unbound water and ice. The dependences of the content of these components of soil water on the temperature were calculated. It was shown that the increase in the mass of unfrozen loosely bound water, as a result of a decrease in the ice mass, determined with dielectric measurements, is quantitatively consistent with the dependence calculated using calorimetric testing. This proves that the changes of the mass of the loosely bound water, determined by dielectric measurements, is a result of the phase transition and the corresponding temperature dependence can be used to determine the characteristics of these phase transitions.

Год издания: 2018

Авторы: Mironov V.L. , Karavayskiy A.Y. , Lukin Y.I. , Pogoreltsev E.I.

Издательство: Elsevier Science Publishing Company, Inc.

Источник: Cold Regions Science and Technology

Выпуск: Т. 153

Номера страниц: 172-180

Держатель оригинала документа: Institute of Engineering Physics and Radioelectronics Siberian State University, Kirensky Institute of Physics,Federal Research Center KSC SB RAS

Количество экземпляров:

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