Record details

    Effects of Water Jet on Heat-Affected Concretes
    Bodnárová, L.
    Foldyna, Josef
    Klich, Jiří
    Novotný, M.
    Sitek, Libor
    Válek, J.
    Zeleňák, Michal
Publication type
    článek v odborném periodiku
Source title - serial
    Procedia Engineering
    Roč. 57, č. 1
    s. 1036-1044
    Autoři celkem: 7
    Projekt: ED2.1.00/03.0082, GA MŠk3cav_un_auth*0280791
    Projekt: GAP104/12/1988, GA ČR, CZ3cav_un_auth*0290666
    Projekt: TA01010948, TA ČR, CZ3cav_un_auth*0301545
    Rozsah: 9 s. : E
Subject category
    fireproof concretes
    repair of structures
    surface layers
Abstract (in english)
   The paper is dealing with the effects of flat high-speed water jet on concretes affected by high temperature. Research should help to correct use of water jet technology in repair works on concrete structures especially after wildfires in tunnels, underground garages, etc., which are exposed to enormous thermal stress. Four concrete mixtures were prepared for tests of interaction of water jet with concrete. The samples were exposed to 200 °C and 600 °C and for comparison one third of samples were left unaffected. It was found, that both lower traversing velocity (cutting speed) and higher water pressure led to removal of higher amount of concrete. Higher temperature loading caused decrease of concrete strength and thus easier removal of surface layers by water jet. Concrete mixtures with basalt aggregate demonstrate higher resistance against water jet penetration regardless thermal loading compared to mixture with standard granodiorite aggregate.
   Presence of polypropylene fibres has substantial influence on concrete strength properties, however only marginal impact on resistance against water jet penetration.
    AV ČR Brno, Ústav geoniky
Contributor code
    AV ČR, ÚG
Source format
Import date
    24. 10. 2014