Why Hydro Demolition?
Hand Arm Vibrations (HAV’s) are one of the biggest problems facing the construction industry. The use of Hydro Demolition to remove concrete virtually eliminates HAV’s meaning that more concrete can be removed than by conventional percussion drill techniques and using fewer operatives on site.
With the use of conventional methods such as jack hammers, small stress fractures known as microfractures are created within the concrete. Although small, these fractures can significantly reduce the strength of the concrete and dramatically increase the chance of eventual delamination of the material. To avoid this concern, Hydro Demolition utilizes the effects of erosion rather than compressive impact to remove concrete. In other words, the water jet removes only the concrete that it is in direct contact with and leaves no residual microfractures.
Preservation of Rebar
Since the aggregate within concrete has a higher compressive strength than the cement surrounding it, our 1000 BAR Hydro Demolition system separates these two components with ease and the aggregate remains intact while the cement it is bonded to is destroyed. Because of this, the Hydro Demolition surface includes a cement base layer with bonded aggregate exposed. This surface is ideal for a monolithic bond to the repaired concrete because the aggregate shares a bonded surface to both the residual and repaired concrete.
Superior Bonding Surface
Due to the high compression properties of steel, the rebar remains unaffected by the high pressure water jet involved utilized in hydrodemolition. In fact, the Hydro Demolition process cleans the steel rebar which actually aids in the overall inspection of the structure.