Podrobnosti záznamu

Název
    Use of X-ray CT for analysis of concretes exposed to high temperatures
Autor
    Bodnárová, L.
    Sitek, Libor
    Souček, Kamil
    Staš, Lubomír
Konference
    5th International Colloquium on Geomechanics and Geophysics (24.06.2014-27.06.2014 : Ostravice, Karolínka, Česká republika)
Jazyk
    anglicky
Typ dokumentu
    abstrakt
Zdrojový dokument - monografie
    5th International Colloquium on Geomechanics and Geophysics. GECO 2014. 5
Strany
    S. 87-88
Poznámky
    Autoři celkem: 4
    Projekt: ED2.1.00/03.0082, GA MŠk3cav_un_auth*0280791
    Rozsah: 2 s. : P
Předmětová kategorie
    aggregate
    cement paste
    concrete
    high temperature
    X-ray tomography
Klíčové slovo
    Analysis
    Concretes
    CT
    Exposed
    High
    Temperatures
    Use
    X-ray
Abstrakt (anglicky)
   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.
Přispěvatel
    AV ČR Brno, Ústav geoniky
Kód přispěvatele
    AV ČR, ÚG
Zdrojový formát
    U
Datum importu
    24. 10. 2014