Hydro-demolition(also known as hydro demolition, hydroblasting, hydro blasting, hydromilling, waterblasting, and waterjettin ) is a popular and efficient method for concrete removal on roadways, bridges, and parking structures. High pressure waterblasting tools allow the concrete to be removed while maintaining structure integrity and preserving the rebar in the process. Hydro-demolition is a more productive and more surgical concrete removal method for many repair applications compared to jackhammering, rotomilling and other percussive methods. It's ideal for removing damaged concrete and preparing a surface to apply new concrete. Hydrodemolition is not used as much for demolition as it is for surface restoration and protection projects. When concrete has deteriorated or the reinforcing steel has begun to corrode, it is necessary to remove any unsound concrete and reinforcing bars (rebar) in order to replace it with new concrete and maintain the integrity of the structure. This process has also been used to remove sound concrete that is not compromised in any way. This may be done to install a preventive cathodic protection system, or to remove concrete in structures in which vibration is a concern. Unlike jackhammers, hydrodemolition does not produce vibrations throughout a structure and therefore does not introduce micro fractures. Hydrodemolition can be used for horizontal, vertical, and overhead concrete removal and surface preparation on reinforced and non-reinforced structures. It is effective in removing concrete from around embedded metal elements such as reinforcing steel, expansion joints, anchorages, conduits, shear connectors, and shear studs. Hydrodemolition can be used for localized removals where deterioration is confined to small areas and for large area removals in preparation for a bonded overlay. This technology can also be used to remove existing coatings from concrete.
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