The Formation of Microcracks in Water-Saturated Porous Ceramics During Freeze-Thaw Cycles Followed by Acoustic Emission

0539475 - ÚJF 2022 RIV US eng J - Journal Article
Húlan, T. - Knapek, Michal - Csáki, Štefan - Kušnír, J. - Šmilauerová, J. - Dobroň, Patrik - Chmelík, F. - Kaljuvee, T. - Uibu, M.
The Formation of Microcracks in Water-Saturated Porous Ceramics During Freeze-Thaw Cycles Followed by Acoustic Emission.
Journal of Nondestructive Evaluation. Roč. 40, č. 1 (2021), č. článku 13. ISSN 0195-9298. E-ISSN 1573-4862
R&D Projects: GA MŠMT EF16_013/0001794
Institutional support: RVO:61389005 ; RVO:61389021
Keywords : acoustic emission * illite * porosity * ceramics * frost damage
OECD category: Materials engineering; Materials engineering (UFP-V)
Impact factor: 2.588, year: 2021
Method of publishing: Limited access
https://doi.org/10.1007/s10921-020-00748-4

The acoustic emission (AE) technique was employed to monitor crack formation in the water-saturated ceramic material subjected to freeze-thaw cycles. The samples with water accessible porosity ranging from 6 to 50 vol% were prepared from the illite-rich clay by the sacrificing template method. The experimental samples were fired to 1100 degrees C in the static air atmosphere. Afterward, they were saturated with distilled water and subjected to the freeze-thaw cycles in the temperature range from - 22 to 20 degrees C. The AE signals occurred repeatedly during freeze-thaw cycling and they were attributed to the formation of microcracks in the ceramic body. The intensity of microcracking increased with increasing porosity. The microcracks were created primarily during the freezing stages of the experiment. Nevertheless, a considerable number of microcracks also appeared during thawing, especially in the ceramic body with pores below 1 mu m. The microcracking during thawing was attributed to the reabsorption of water by tiny pores.
Permanent Link: http://hdl.handle.net/11104/0317211