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Use of X-ray CT for analysis of concretes exposed to high temperatures
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SYSNO ASEP 0430268 Document Type A - Abstract R&D Document Type Není vybrán druh dokumentu Title Use of X-ray CT for analysis of concretes exposed to high temperatures Author(s) Sitek, Libor (UGN-S) RID, ORCID
Bodnárová, L. (CZ)
Souček, Kamil (UGN-S) RID, ORCID
Staš, Lubomír (UGN-S) RID, ORCIDNumber of authors 4 Source Title 5th International Colloquium on Geomechanics and Geophysics. GECO 2014, 5. - Ostrava : Ústav geoniky AV ČR, 2014 / Koníček P. ; Souček K. ; Heroldová N. - ISBN 978-80-86407-49-4
S. 87-88Number of pages 2 s. Publication form Print - P Action 5th International Colloquium on Geomechanics and Geophysics Event date 24.06.2014-27.06.2014 VEvent location Ostravice, Karolínka Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords X-ray tomography ; concrete ; cement paste ; aggregate ; high temperature Subject RIV JQ - Machines ; Tools R&D Projects ED2.1.00/03.0082 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GAP104/12/1988 GA ČR - Czech Science Foundation (CSF) Institutional support UGN-S - RVO:68145535 Annotation Concrete has many advantageous properties, e.g. inflammability or low temperature conductivity. However, when a concrete construction is exposed to high temperatures, it loses its load-bearing capacity, especially in surface layers which are loaded at most. A serious problem represents the so-called explosive spalling which is caused by the combination of increasing pressure in inner pores and inner compressive stresses originating from material expansion at higher temperatures. Spalling of a concrete layer leads to weakening of the concrete cross section of a reinforced construction and, in some cases, to exposure of steel reinforcement to temperatures above the critical level. Defects can be so serious that the complete construction gets destroyed. Design of a concrete mixture with resistance to thermal exposure for a certain period of time has been classified among the passive fire protection methods. Basic composition of the cement concrete can be problematic, as it is the composite material consisting of two markedly different components, i.e. the cement paste and aggregate. Workplace Institute of Geonics Contact Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354 Year of Publishing 2015
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