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07303 EVALUATING THE CHLORIDE PERMEABILITY OF A CHEMICAL GROUT USED TO SEAL LEAKS IN POST-TENSIONING

Picture for 07303 EVALUATING THE CHLORIDE PERMEABILITY OF A CHEMICAL GROUT USED TO SEAL LEAKS IN POST-TENSIONING
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Product Number: 51300-07303-SG
ISBN: 07303 2007 CP
Author: Ryan Tinnea
Publication Date: 2007
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In August of 2003, water was discovered leaking into post-tensioning (PT) ducts for loop tendons of the Woodrow Wilson Bridge. This structure is being built to cross the Potomac River in Washington D.C. At the bridge location, the Potomac is slightly brackish. To prevent corrosion, the water was pumped out of the ducts, and the ducts were sealed using an acrylic polymer gel. After sealing the ducts, the PT tendons were run, loaded and the duct annulus filled with a cementitious grout. To evaluate the acrylic gel seal corrective strategy, test specimens were prepared that generally followed the configuration given in the Post- Tensioning Institute’s (PTI) Accelerated Corrosion Test (ACT). These specimens were modified to include fabricated cracks of differing widths that were sealed with the acrylic gel. The specimens were then subjected to the 1000-hour ACT. This paper details the test method modifications developed, the results obtained and a discussion of the findings.
In August of 2003, water was discovered leaking into post-tensioning (PT) ducts for loop tendons of the Woodrow Wilson Bridge. This structure is being built to cross the Potomac River in Washington D.C. At the bridge location, the Potomac is slightly brackish. To prevent corrosion, the water was pumped out of the ducts, and the ducts were sealed using an acrylic polymer gel. After sealing the ducts, the PT tendons were run, loaded and the duct annulus filled with a cementitious grout. To evaluate the acrylic gel seal corrective strategy, test specimens were prepared that generally followed the configuration given in the Post- Tensioning Institute’s (PTI) Accelerated Corrosion Test (ACT). These specimens were modified to include fabricated cracks of differing widths that were sealed with the acrylic gel. The specimens were then subjected to the 1000-hour ACT. This paper details the test method modifications developed, the results obtained and a discussion of the findings.
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