Renovation and replacement of deteriorated concrete
bridges, substructures, and roadways are of vital
concern to highway and bridge maintenance personnel. As
the demand for safe and efficient selective demolition
work increases, so does the demand for better methods to
expedite the demolition process.
Conventional methods for removal of deteriorated
concrete traditionally include jack hammering. In recent
times, however, there has been a decline in the use of
this equipment, probable reasons being that new
alternatives have emerged and its following
DISADVANTAGES OF JACK HAMMERING
removal of sound concrete along with bad concrete
generates micro fractures in sound concrete
- Micro fracturing
of sound concrete due to vibration
damage to rebar
- Uncertainty as to
complete removal of deteriorated concrete and
injuries in fingers and arms of the operator.
- It is time
- Dust formation
and noise level are also high
PressureJetís high pressure water jet system eliminates
these negative results by utilizing high pressure water
Hydro-Demolition process is successfully utilized to
remove deteriorated concrete, leaving sound concrete
with a rough profile, perfect for bonding the newly
poured overlay. Hydro demolition is a relatively new
method of removing select portions of a hardened
Hydro-Demolition is a technology that uses extremely
high pressure water jet that is capable of removing
concrete while not damaging the rebar. The practical
application of this technique makes it an extremely
effective and efficient method of concrete removal. This
is due to two main factors, one being the direct impact
of the water jet on the surface. The other is the porous
nature of concrete, the high pressure water is forced
into the tiny cavities and cracks within the concrete
mass, causing it to fracture and split.
this high pressure water jet equipment breaks up
concrete by disintegrating the cement matrix between
aggregates. The demolishing effect can be tightly
controlled to a desired level of removal, ranging from
light scarification of the surface to deep penetration
of the structural element. The use of the hydro
demolition process has several advantages over
conventional concrete removal methods, such as jack
ADVANTAGES OF HYDRO-DEMOLITION
Material Removal The variable parameters of the
technique, water pressure, jet size and speed of
application, make it possible to demolish and remove
concrete in a very precise and controlled way. These
variables enable selective removal of deteriorated
or de-laminated concrete, as the jet stream
penetrates the cracks and faults in the degraded
material more quickly, leaving the sound concrete
Removal The equipment can also be set to remove
concrete to predetermined depths. These capabilities
make it a very suitable method of enabling repairs
to concrete structures, as it allows accurate
removal of material, leaving the sub-structure and
steel reinforcement intact if required.
exposed, washed and scarified surface on the
aggregate, providing an ideal surface for the
bonding of new layers.
irregular surface profile is created to provide an
excellent mechanical bond for all types of repair
micro-fracturing (bruising) caused by mechanical
removal methods are eliminated.
and mortar paste.
cleaned and undamaged
Can precisely and
selectively remove damaged or deteriorated concrete,
leaving sound concrete intact.
reduces unnecessary de-lamination or damage to
reinforcing can be exposed and cleaned of rust and
scale without damage.
excellent bonding of exposed substrate to new layers
due to its cleaning action.
ion concentrations at bonded surfaces.
Is faster and
more efficient than conventional mechanical methods
Rebar is cleaned,
undamaged, and free of corrosive chlorides
Saves time in
demolition, as well as eliminating time consuming
rebar replacement and repair
Vibration to the
surrounding structure is eliminated.
disruptions to users of occupied space by
significantly reducing transmitted sound through the
of concrete removal can reduce construction time.
and the potential for silicosis.
vibration is minimal.
above obvious advantages, hydro demolition has
become a first choice vis-ŗ-vis other conventional
methods. Itís no wonder why so many contractors and
other construction personnel are switching to the power
of water jetting for Hydro-Demolition.