Analysis of inner structure changes of concretes exposed to high temperatures using micro X-ray computed tomography

0449381 - ÚGN 2016 RIV CZ eng J - Článek v odborném periodiku
Sitek, Libor - Bodnárová, L. - Souček, Kamil - Staš, Lubomír - Gurková, Lucie
Analysis of inner structure changes of concretes exposed to high temperatures using micro X-ray computed tomography.
Acta geodynamica et geomaterialia. Roč. 12, č. 1 (2015), s. 78-89. ISSN 1214-9705. E-ISSN 2336-4351
Grant CEP: GA ČR GAP104/12/1988
Institucionální podpora: RVO:68145535
Klíčová slova: concrete * cement paste * aggregate * high temperature
Kód oboru RIV: JQ - Strojní zařízení a nástroje
Impakt faktor: 0.561, rok: 2015
https://www.irsm.cas.cz/materialy/acta_content/2015_doi/Sitek_AGG_2015_0009.pdf

The X-ray Computed Tomography (X-ray CT) repr esents a progressive non-destructive metho d of analysing the inner structure of materials. The method was used for monitoring changes in inner structure of concrete samples of different composition before and after their exposure to various thermal loads. Eight types of concrete samples were prepared which differed by cement and aggregate types. We intentionally used such composition of concrete mixtures which increased their resistance to high temperatures. The inner structure of samples was analysed using the micro X-ray CT before the therma l loading and after exposure of samples to temperatures of 600 °C or 900 °C. Damages and character of changes in the inner structure caused by high temperatures were influenced by the character of cement and aggregate we used. The analysis of obtained results is presented in the paper.
Trvalý link: http://hdl.handle.net/11104/0250945