Publication detail

Effects of water jet on heat-affected concretes

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

Original Title

Effects of water jet on heat-affected concretes

English Title

Effects of water jet on heat-affected concretes

Type

journal article - other

Language

en

Original Abstract

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.

English abstract

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.

Keywords

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

RIV year

2013

Released

10.05.2013

Publisher

Procedia Engineering

Location

Vilnius - Lithuania

ISBN

1877-7058

Periodical

Procedia Engineering

Year of study

2013

Number

57

State

NL

Pages from

1036

Pages to

1044

Pages count

9

Documents

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",
  annote="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.",
  address="Procedia Engineering",
  chapter="99655",
  institution="Procedia Engineering",
  number="57",
  volume="2013",
  year="2013",
  month="may",
  pages="1036--1044",
  publisher="Procedia Engineering",
  type="journal article - other"
}