There are times, when a structure is showing signs of distress, and at such times one of the first things that engineers do is check on the position of the rebar, as any shift from previously designed parameters can lead to weaker structures.

2. Concrete has a very high
compressive strength
compared to its tensile
strength which is very low.
It is possible to increase
this tensile strength by
introducing rebar in to
concrete to.
make a reinforced concrete structure which can then
take both compressive and tensile stresses and make for
structures that have strength and durability.
More info on:
http://scanconcrete.com.au/concrete-scanning/conduits-and-rebar-location-detection

3. Rebar in reinforced concrete needs
to be put at very specific locations
so that it allows the structure to
have the required tensile strength.
This is done by using spacers and
other devices to lock rebar into the
specific required locations, which
remain so, even when the fluid
concrete is poured into the formwork
that makes up the shape of the
desired structure.
More info on:
http://scanconcrete.com.au/concrete-scanning/conduits-and-rebar-location-detection

4. Rebar is made of steel which is vulnerable to rust from
atmospheric conditions. This is why rebar needs to be
kept at a certain distance within the concrete to prevent
any rust formation. Rust formation can cause rebar to
lose its form and strength and thus affect the strength of
the reinforced concrete structure.
More info on:
http://scanconcrete.com.au/concrete-scanning/conduits-and-rebar-location-detection

5. Quite often it is necessary to create
new ducts or holes in a reinforced
concrete structure to position
services or other utilities. When this
requires the concrete structure to be
drilled through or partially, it is very
important to make sure that any such
modification is not hampered by the
presence of the rebar.
More info on:
http://scanconcrete.com.au/concrete-scanning/conduits-and-rebar-location-detection

6. It then becomes very important to know the exact
position of the rebar, so that any drilling or breaking
done does not come across a rebar. While this can
negate the entire process of installing new
utilities, because of this obstruction, any damage to the
rebar can severely affect the strength of the structure.
More info on:
http://scanconcrete.com.au/concrete-scanning/conduits-and-rebar-location-detection

7. These concrete scanning
operations use ground
penetrating radar to locate
rebar. This allows the exact
location for the rebar to be
established so that any
subsequent operations can
avoid damaging them.
More info on:
http://scanconcrete.com.au/concrete-scanning/conduits-and-rebar-location-detection

8. There are times, when a
structure is showing signs of
distress, and at such times one
of the first things that engineers
do is check on the position of the
rebar, as any shift from
previously designed parameters
can lead to weaker structures.
More info on:
http://scanconcrete.com.au/concrete-scanning/conduits-and-rebar-location-detection