Engineers quite often find the need of measuring concrete slab thickness, 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. Most of these devices are economical and while being very user friendly, are eminently portable. Data produced them can be directly fed into computers and this allows for automatic warning systems to be put into place. 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. This gives a very big range that allows most structures to be measured. The functioning of these devices is not affected by paints and measurements can be carried out, even through tiles.
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 visible or approachable 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.
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