Record details

Title
    Use of X-ray CT for analysis of concretes exposed to high temperatures
Author
    Bodnárová, L.
    Sitek, Libor
    Souček, Kamil
    Staš, Lubomír
Conference
    5th International Colloquium on Geomechanics and Geophysics (24.06.2014-27.06.2014 : Ostravice, Karolínka, Česká republika)
Language
    anglicky
Publication type
    abstrakt
Source title - monograph
    5th International Colloquium on Geomechanics and Geophysics. GECO 2014. 5
Pages
    S. 87-88
Notes
    Autoři celkem: 4
    Projekt: ED2.1.00/03.0082, GA MŠk3cav_un_auth*0280791
    Rozsah: 2 s. : P
Subject category
    aggregate
    cement paste
    concrete
    high temperature
    X-ray tomography
Keyword
    Analysis
    Concretes
    CT
    Exposed
    High
    Temperatures
    Use
    X-ray
Abstract (in english)
   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.
Contributor
    AV ČR Brno, Ústav geoniky
Contributor code
    AV ČR, ÚG
Source format
    U
Import date
    24. 10. 2014