TWE’s geophysical department has purchased a new ground-penetrating radar (GPR) system—the SmartChariot. The SmartChariot is a tow-behind GPR system manufactured by Sensors & Software, Inc. designed to streamline and simplify GPR data collection and increase productivity in the field. The SmartChariot’s main use is for pavement analysis using a 1000 MHz antenna to measure pavement thickness and depth to the top of rebar along with rebar spacing. It can collect data at speeds up to 15 mph and record lengths that can be about a quarter mile. What this means for our clients is that we can now collect data at a much faster rate and with longer records on large areas that need to be surveyed in comparison with other GPR systems such as the Noggin SmartCart and hand-towed Conquest GPR, which can be time-consuming or simply not feasible
TWE had a recent opportunity to utilize the new SmartChariot on a project that has questionable concrete thickness and rebar placement over an estimated 630,000 square foot area.
TWE’s phase I program, performed by TWE’s construction materials testing division (CMT), consisted of coring the concrete slab in thirty locations. The concrete thicknesses ranged from 2.5” to 7” with an average of 5.02”. The rebar placement varied from the center of the concrete slab to beneath the slab.
The phase II portion of the project was awarded to TWE’s geophysical group which entailed covering the entire site with data collected in lines spaced at 10 foot intervals with ground-penetrating radar (GPR).
TWE is using Sensors and Software, Inc.’s SmartChariot ground-penetrating radar (GPR) to measure the thickness of the concrete and depth of the rebar placement.
TWE’s scope of services for the phase II approach includes: conducting GPR exploration, processing the GPR data, making interpretations of the collected data, producing a written account of the condition of the concrete, and rebar over the site.
The laboratory and field data from phase I of the project and the field data collected in phase II will be used in conjunction to map the concrete thickness and rebar placement of the surveyed area.