Original scientific paper

High-speed water jet (HSWJ) for concrete surface treatment – evaluation of concrete surface properties after blasting using HSWJ technology

Lenka Bodnárová ; Brno University of Technology, Faculty of Civil Engineering, Institute of Technology of Building Materials and Components, Veveri 331/95, 602 00 Brno, Czech Republic
Rudolf Hela ; NET spol s.r.o., Nádražní 309, 788 32 Staré Město pod Sněžníkem, Czech Republic
Ivan Wolf ; Brno University of Technology, Faculty of Civil Engineering, Institute of Technology of Building Materials and Components, Veveri 331/95, 602 00 Brno, Czech Republic
Jaroslav Válek ; Brno University of Technology, Faculty of Civil Engineering, Institute of Technology of Building Materials and Components, Veveri 331/95, 602 00 Brno, Czech Republic

Abstract

The article summarizes the results of the interaction of high-speed water jet (HSWJ) and concrete with precisely defined properties. HSWJ technology is inconvertible for renovation of concrete structures, in particular for removing degraded layer of concrete. Concrete structures are exposed to aggressive influences of environment during their lifetime. Concrete can also be damaged by inappropriate use of the structure, overloading or action of fire. When using HSWJ technology to disintegrate concrete surfaces it is necessary to set the jet parameters according to the properties of the concrete. The concrete properties have crucial impact on the interaction of HSWJ and concrete. The properties of tested concretes in fresh and hardened state were described. The results of disintegration of concrete using high-speed water jet were determined after measuring the cut depth. The evaluation of properties of concrete surfaces cured with HSWJ technology includes namely surface tensile strength and observation of the influence of the jet on the surroundings of the cut, possible cracks and the overall appearance of the concrete surface including photographs. These values were compared in relation to the defined concrete properties and the parameters of the jet (water pressure, flow rate and jet type).

Keywords

high-speed water jet; concrete; surface; depth of cut; reconstruction; relief of blasted concrete surface

Hrčak ID:

83912

URI

https://hrcak.srce.hr/83912

Publication date:

29.6.2012.

Article data in other languages: croatian

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