Homepage » Case Study » Non-Destructive Evaluation of Concrete Caissons – Go Transit Station

Non-Destructive Evaluation of Concrete Caissons – Go Transit Station

Scope

FPrimeC Solutions was retained by EllisDon Corp. (Client) to perform non-destructive evaluation and testing on the top sections of concrete caissons (piles) at one of the GO Transit Stations located in Greater Toronto Area (GTA). The client was interested in examining the quality of concrete in the top section of the caissons. The main objective of this investigation project was to evaluate the quality of concrete in the exposed areas using non-destructive testing and evaluation.

Solution

Following communication with Client, a test plan was prepared and communicated with Client’s representative. A test method involving ultrasonic testing solution was designed and proposed.

Ultrasonic Pulse Velocity (UPV) was used to correlate the measured wave velocity at select locations to the quality of concrete in the test area. The ultrasonic testing was conducted according to the recommendations of the ASTM C-597  and the measurements were used to study the quality of concrete around the piles heads. UPV measurement was performed by placing transducers on the perimeter of the piles. The soil around the piles heads was excavated by Client to a depth of approximately 750 mm (measured from the highest point on the pile head). The measurements were performed through a number of trajectories at different elevations (Learn more).