Title:
Assessing Pour-Back Durability: Beyond Pull Off Testing
Author(s):
Brenkus
Publication:
Web Session
Volume:
ws_S23_Brenkus.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
4/2/2023
Abstract:
Pour-backs are essential to protect the long-term durability of posttensioned structures by providing corrosion protection for post-tensioning anchorages and vents. However, the interface between the pour-back and concrete element forms a vulnerable pathway for chloride ion intrusion. This study quantifies the potential for chloride intrusion along posttensioning pour-back interfaces. Both surface preparation along the interface and pour-back materials are expected to impact the vulnerability to chloride intrusion. Test specimens were created using four typical surface preparations and eight different material interfaces. These interface specimens were evaluated for porosity, bond strength, and depth of chloride ion penetration in order to quantify the relationship between surface preparation and chloride permeability.