Detail publikačního výsledku

Effects of water jet on heat-affected concretes

SITEK, L.; BODNÁROVÁ, L.; VÁLEK, J.; ZELEŇÁK, M.; KLICH, J.; FOLDYNA, J.; NOVOTNÝ, M.

Originální název

Effects of water jet on heat-affected concretes

Anglický název

Effects of water jet on heat-affected concretes

Druh

Článek recenzovaný mimo WoS a Scopus

Originální abstrakt

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.

Anglický abstrakt

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.

Klíčová slova

concrete, heating, fire, fireproof concretes, repair of structures, surface layers, water jet

Klíčová slova v angličtině

concrete, heating, fire, fireproof concretes, repair of structures, surface layers, water jet

Autoři

SITEK, L.; BODNÁROVÁ, L.; VÁLEK, J.; ZELEŇÁK, M.; KLICH, J.; FOLDYNA, J.; NOVOTNÝ, M.

Rok RIV

2014

Vydáno

10.05.2013

Nakladatel

Procedia Engineering

Místo

Vilnius - Lithuania

ISSN

1877-7058

Periodikum

Procedia Engineering

Svazek

2013

Číslo

57

Stát

Spojené království Velké Británie a Severního Irska

Strany od

1036

Strany do

1044

Strany počet

9

Plný text v Digitální knihovně

http://hdl.handle.net/

BibTex

@article{BUT99655,
  author="Libor {Sitek} and Lenka {Bodnárová} and Jaroslav {Válek} and Michal {Zeleňák} and Jiří {Klich} and Josef {Foldyna} and Miloslav {Novotný}",
  title="Effects of water jet on heat-affected concretes",
  journal="Procedia Engineering",
  year="2013",
  volume="2013",
  number="57",
  pages="1036--1044",
  issn="1877-7058"
}