How to Measure Concrete Thickness by Using a Concrete Thickness Gauge?

Posted by PCTE on July 3rd, 2017

Measuring concrete thickness is one of the steps to ensuring the integrity, quality, and strength of the material. To do this, you will need a concrete thickness gauge, which eliminates the need to perform coring, drilling, and excavations. This non-destructive and non-invasive way to measure concrete thickness can help you save a lot of effort, money, and time, as it eliminates the need for other equipment and special training to operate it. Here’s a quick guide to measuring concrete thickness using a concrete thickness gauge: 

  • Connect the device to your laptop – Use an appropriate cable to connect the concrete thickness gauge to your laptop running Windows 7, 8, or 10. It is possible to connect the device to a tablet, too. If using a tablet, make sure it has the app designed to make your gadget support the device. 
  • Calibrate the concrete thickness gauge – The device has built-in default parameters, and you can calibrate it against the type of concrete you intend to test. Hold the gauge against the concrete to enable calibration. The default settings pertain to standard concrete and will produce results within a ±10% accuracy. An accuracy of ±2% can be achieved when you calibrate the p-wave velocity on-site against a concrete slab with a known thickness.
  • The testing procedure – You can customise the grid test area as required. The concrete thickness gauge works according to the principle of Impact Echo where a mechanical tap from a solenoid impactor releases low-frequency p-waves, which propagates within the structure before being reflected back by flaws and external surfaces. The transducer is positioned adjacent to the impactor to receive the waves.

Time traces are noted by the device and the software, and converted into frequency using a Fast Fourier Transform with reference to the frequency amplitude. Depth is identified based on the measured compressional wave velocity through the concrete and the highest frequency peak. 

  • View the results live –View the measurement recordings in real-time through the gauge’s software installed in your laptop or tablet. Flaw and thickness information can be transferred to your reports or to spreadsheets. 
  • Diagnosing – The extent and depth of partial cracks, flaws, and voids are recorded as a waveform. Time domain signal determines where the poor-quality data came from during field testing. Nearby peaks could pertain to internal defects and cracking. 

About the Company: 

PCTE supplies a range of equipment from around the world to offer you a one stop shop with all of the latest equipment. Concrete Non-Destructive Testing (NDT) comprises testing a property of concrete, largely without damaging the concrete to assess some parameter that either directly or indirectly provides a required characteristic of the concrete or its embedment. For more details, you can contact us at the website.


About the Author

Joined: November 21st, 2013
Articles Posted: 38

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