Concrete tendon gripping and sealing apparatus and method

A seal assembly for sealing a tubular extension of a concrete stressing component and a sheath of a concrete stressing tendon, the seal assembly comprising:

• a seal dimensioned and configured to extend around a circumference of the sheath and adapted to engage an end portion of the tubular extension while a portion of the sheath is contained within the tubular extension, the tubular extension being integrally formed with an encapsulation of the concrete stressing component, the seal including an outer shoulder positioned adjacent a terminal end of the seal;
• and
• a seal activating member adapted to compress the seal into engagement with the extension and the sheath to seal the sheath and the extension, the seal activating member activating member engaging the outer shoulder and adapted to bias the outer shoulder against an end surface of the extension;
• wherein the seal includes an annular elastic member axially compressed between the tubular extension and the seal activating member to cause radial deformation of the annular elastic member thereby resulting in sealing engagement with the annular elastic member and the sheath;
• and
• wherein the annular elastic member includes a ferrule-shaped seal having a front portion, a rear portion, and a bore extending from the front portion to the rear portion, the bore being dimensioned to be received on the sheath, the front portion being at least partially receivable inside the extension, the shoulder positioned at the rear portion, the shoulder of the seal being adapted to engage the seal activating member to force the front portion of the ferrule between the sheath and the interior surface of the extension and compress the front portion between the sheath and the interior surface of the extension to seal the sheath and the extension.