FPrimeC Solutions Inc. was engaged by an oil refinery in Fort McMurray, Alberta to perform concrete inspection and non-destructive evaluation of concrete on Sulphur Pit in an oil and energy facility. The structural system of the concrete roof was understood to be precast concrete panels, with post-tensioning cables. The objective of this investigation was to determine the present condition of the concrete roof as well as to determine the structural details, such as roof thickness, rebar spacing, continuity of post tensioning system, and estimate rebar depth/size, where applicable.

    Non-destructive Evaluation of Sulphur Pit Roof 

    A combination of Ultrasonic Pulse Echo (UPE) and Ground Penetrating Radar (GPR) tests was used to assess the condition of the concrete and find the location of the rebar and post-tensioning cables.  The combination of these tests allow us to determine the overall structural soundness of the Sulphur pit cover, and advise asset holders regarding the necessary repair and rehabilitation priorities.

    Ultrasonic Pulse Echo Testing of Sulphur Pit

    Ultrasonic Pulse Echo (UPE) was used to verify the thickness of concrete roof slab, and assess concrete quality and uniformity at select areas. 

    GPR Scanning of Sulphur Pit

    Ground Penetrating Radar (GPR) was used to identify the location of rebar, and verify the continuity of post-tensioning cables.