Title:
Effect of Surface Preparation Techniques on Concrete- Grout Interfaces
Author(s):
Anthony Addai Boateng, Garrett Tatum, and Natassia Brenkus
Publication:
Materials Journal
Volume:
122
Issue:
1
Appears on pages(s):
51-64
Keywords:
cementitious grout; chloride ion; epoxy grout; surface preparation; tensile bond strength
DOI:
10.14359/51744378
Date:
1/1/2025
Abstract:
Pourbacks and overlays are commonly used in bridge elements
and repairs, as it is crucial to corrosion protection that the bond
between grout and concrete in these regions is carefully constructed.
The integrity of the bond is crucial to ensure a barrier against
water, chloride ions, moisture, and contaminants; bond failure can
compromise the durability of concrete structures’ long-term performance. This study examines the influence of surface preparation methods on the bond durability and chloride permeability between concrete substrate and grouts, including both non-shrink cementitious and epoxy grouts. A microstructural analysis of scanning electron microscopic (SEM) images was conducted to characterize the porosity of specimen interfaces. Pulloff testing was performed to quantify tensile strength. Results show that a water-blasted surface preparation technique improved the tensile bond strength for cementitious grout interfaces and reduced porosity at the interface. In contrast, epoxy grout interfaces were less affected by surface preparation. The study establishes a relationship between chloride ion permeability, porosity, and bond strength. The findings highlight the importance of surface preparation in ensuring the durability of concrete-grout interfaces.