Engineers
quite often find the need to measure the thickness of a concrete slab, when
they require making some modifications to the slab. They may also need such
information when they are planning any additions, or have doubts about the
structural stability of the slab to bear present or future loads. When a non
destructive method of measuring the thickness of a concrete slab can be of
great advantage, this is.
Such non
destructive testing enables the information to be obtained without having to
conduct on site breaking of a slab or even taking cores to get the information.
This reduces any need for future repairs to the damaged portion of the slab,
which is in a sense weakened by such actual breaking of the concrete. One of
the most common of these devices uses ultrasonic frequencies or other systems
that propagate vibrations.
The
vibration generator produces frequencies varying from 1,000 c/s to 4,000 c/c
and these are made to act vertically on the slab whose thickness is required.
These vibrations are detected by a pick-up device, which is then moved around
till the vibrations of the generator and those detected in the pickup are in
phase. These measuring devices are all hand held and battery powered, which
makes their use very versatile and allows their use in the most restricted of
situations.
Concrete slab measurements are quite often required to ensure quality control in
pavements, tunnel linings and other structures that have a continuous plate.
These instruments are calibrated using them on slabs whose thicknesses are
known and confirmed. Both thin and thick slabs can be measured, and while for
thin slabs the range that can be detected varies from 2.8 t0o 22 inches, when
the thick mode is used, slabs can be between 10 and 60 inches.
Quality
assurance and control engineers use these devices constantly in pavements and
linings that are difficult to measure after the work is in place, because one
side of the slab is no more approachable or visible once the work is completed.
Frequently when holes are needed to be drilled in existing slabs to introduce
additional services, these devices may be used in conjunction with rebar
locators so that the any drilling that is done is done with the full knowledge
of what is likely to be encountered during the operation.
Engineers
quite often find the need to measure the thickness of a concrete slab, when
they require making some modifications to the slab. These instruments are
calibrated using them on slabs whose thicknesses are known and confirmed. Both
thick and thin slabs can be measured, and while for thin slabs the range that
can be detected varies from 2.8 t0o 22 inches, when the thick mode is used,
slabs can be between 10 and 60 inches.
C.S.I.
Concrete Scanning & Investigation
Broadbeach,
QLD
4218
Contact us: 0426 508 755
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