Use of Pulsating Water Jet Technology for Removal of Concrete in Repair of Concrete Structures

Libor Sitek, Josef Foldyna, Petr Martinec, Jiří Ščučka, Lenka Bodnárová, Rudolf Hela

Abstract


High-speed water jet technology is commonly used for removing degraded concrete surface layers selectively in the process of repair of concrete structures. This technology offers number of advantages (such as reduced noise, dust and vibrations, preservation of intact material and thus more delicate intervention into the structure), but it still requires further improvement in terms of productivity and cost effectiveness to be even more competitive to traditional methods of concrete surface layers removal. The impact of a high-velocity liquid drop or bunch of water on a rigid surface generates extremely short high-pressure transients that can cause substantially serious damage to the surface and interior of the solid material. Therefore, the use of pulsating water jets, that are able to generate repeatedly above mentioned high-pressure transients, can lead to higher performance of pulsating high-speed water jets compared to continuous ones under the same operating conditions. A special method of the generation of the high-speed pulsating water jet was developed recently and tested extensively under laboratory conditions. The method is based on the generation of acoustic waves by the action of the acoustic transducer on the pressure liquid and their transmission via pressure system to the nozzle. A series of laboratory experiments was performed to compare effects of pulsating and continuous jets (both rotating and flat fan) acting on concrete surface. A rate of concrete removal was used to evaluate the jet. Results of the study of effects of pulsating and continuous high-speed water jets on concrete surfaces using methods of optical microscopy and image analysis are also discussed in this paper.


Keywords:

high-speed water jet technology; pulsating jet; rotating jets; removal of concrete layer; concrete repair; rehabilitation of bridges

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References


Blades, B. 1994. Energy Distribution and Computer Modelled Nozzle Design in High Pressure Water Jet Coating Removal, in Proc. of the 7th National Thermal Spray Conference. Ed. by Berndt, C. C.; Sampath, S. June 20–24, 1994. Boston, USA, 421–424.

Chahine, G. L.; Conn, A. F.; Johnson, V. E.; Frederick, G. S. 1983. Cleaning and Cutting with Self-Resonating Pulsed Water Jets, in Proc. of the 2nd U.S. Water Jet Symposium. May 24–26, 1983. Ed. by Summers, D. A.; Haston, F. F. Rolla, Missouri, 167–173.

Foldyna, J.; Sitek, L.; Švehla, B.; Švehla, Š. 2004. Utilization of Ultrasound to Enhance High-Speed Water Jet Effects, Ultrasonics Sonochemistry 11(3–4): 131–137. doi:10.1016/j.ultsonch.2004.01.008

Foldyna, J.; Habán, V.; Pochylý, F.; Sitek, L. 2007. Transmission of Acoustic Waves, in Proc. of the International Congress on Ultrasonics. April 9–13, 2007, Vienna, Austria. Paper ID 1458, Session R12: High power ultrasonic processing. doi:10.3728/ICUltrasonics.2007.Vienna.1458_foldyna

Foldyna, J.; Jekl, P.; Sitek, L. 2001. Possibilities of Utilization of Modulated Jets in Rock Cutting, in Proc. of the 1st International Conference Mining Techniques. Ed. by Filipowicz, F. Krynica, Poland, 85–96.

Hlaváč, L.; Foldyna, J.; Momber, A. 1993. Das Schneiden von Gesteinen mit rotierenden Hochdruckwasserstrahlen, Glückauf-Forschungshefte 54(2): 58–62.

Kasai, Y. E. 1988. Demolition Methods and Practice. Demolition and Reuse of Concrete and Masonry, in Proc. of the 2nd International RILEM Symposium. November 7–11, 1988, Tokio, Japan. London: Champman and Hall.

Manning, D. G. 1991. Removing Concrete from Bridges. National Cooperative Highway Research Program Synthesis of Highway Practice 169: 48. Transportation Research Board, Washington DC.

Martinec, P.; Scucka, J.; Vavro, M.; Safrata, J. 2008. Granodiorite Aggregates from East Bohemia for High-Performance and High-Strength Concretes, Quarterly Journal of Engineering Geology and Hydrogeology 41(4): 451–458. doi:10.1144/1470-9236/07-035

Momber, A. W. 2005. Hydrodemolition of Concrete Surfaces and Reinforced Concrete. Oxford: Elsevier. 278 p.

Momber, A. W. 2003. An SEM-Study of High-Speed Hydrodynamic Erosion of Cementitious Composites, Composites Part B: Engineering 34(2): 135–142. doi:10.1016/S1359-8368(02)00082-3

Momber, A. W. 2001. Fluid Jet Erosion as a Non-Linear Fracture Process: a Discussion, Wear 250(1–12): 100–106. doi:10.1016/S0043-1648(01)00615-9

Momber, A. W. 2000a. Concrete Failure Due to Air-Water Jet Impingement, Journal of Material Science 35(11): 2785–2789. doi:10.1023/A:1004782716707

Momber, A. W. 2000b. Short-Time Cavitation Erosion of Concrete, Wear 241(1): 47–52. doi:10.1016/S0043-1648(00)00348-3

Nebeker, E. B. 1987. Percussive Jets – State-of-the-Art, in Proc. of the 4th U.S. Water Jet Symposium. Ed. by Hood, M.; Dornfeld, D. California: Berkeley, 32–45.

Nebeker, E. B. 1984. Potential and Problems of Rapidly Pulsing Water Jets, in Proc. of the 7th International Symposium Jet Cutting Technology. Ed. by Walls, I. A.; Stanbury, J. E. Cranfield: BHRA, 51–68.

Shen, Z.; Wang, Z. M. 1988. Theoretical Analysis of a Jet-Driven Helmholtz Resonator and Effect of Its Configuration on the Water Jet Cutting Properties, in Proc. of the 9th International Symposium on Jet Cutting Technology. Sendai, Japan. Cranfield: BHRA, D4189.

Sitek, L.; Foldyna, J.; Ščučka, J.; Švehla, B.; Bodnárová, L.; Hela, R. 2003. Concrete and Rock Cutting Using Modulated Water Jets, in Proc. of the 7th Pacific Rim International Conference on Water Jetting Technology. Ed. by Lee, Ch.-I.; Seokwon, J.; Song, J.-J. Korea: Jeju, 235–244.

Sitek, L.; Foldyna, J.; Ščučka, J.; Młynarczuk, M.; Sobczyk, J. 2002. Quality of Bottom Surface of Kerfs Produced by Modulated Jets, in Proc. of the 16th International Conference on Water Jetting. 16–18 October, 2002, Aix-en-Provence, France. Ed. by Lake, P. Cranfield, BHR Group Limited, 359–368.

Summers, D. A. 1995. Waterjetting Technology. Spon Press. 882 p. ISBN: 0419196609.

Toutanji, H.; Ortiz, G. 2001. The Effects of Surface Preparation on the Bond Interface Between FRP Sheets and Concrete Members, Composite Structures 53(4): 457–462. doi:10.1016/S0263-8223(01)00057-5

Vijay, M. M. 1992. Ultrasonically Generated Cavitating or Interrupted Jet. Patent No. 5154347 of the United States of America, published on 13.10.1992.

Vijay, M. M. 1994. Power of Pulsed Liquid Jets, in Proc. of the International Conference on Geomechanics 93. September 28–30, 1993, Hradec, Czech Republic. Ed. by Rakowski, Z. Rotterdam: A. A. Balkema, 265–274.

Vijay, M. M.; Foldyna, J. 1994. Ultrasonically Modulated Pulsed Jets: Basic Study, in 12th International Conference on Jet Cutting Technology. October 25–27, 1994, Rouen, France. Ed by Allen, N. G. London: BHR Group Conference Series, Mechanical Engineering Publications Limited, 15–35.

Yan, W.; Tieu, A.; Ren, B.; Vijay, M. M. 2004. Removal of Delaminated Concrete and Cleaning the Rust off the Reinforcing Bars Using High-Frequency Forced Pulsed Waterjet, in Proc. of 17th International Conference Water Jetting – Advances and Future Needs. 7–9 September, 2004, Mainz, Germany, 2004. Cranfield: BHR Group, 183–195.




DOI: 10.3846/bjrbe.2011.30

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