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- Title
Durability of Repairs under Freezing and Thawing and Alkali-Aggregate Reaction.
- Authors
Tahmureszadeh, Keikhosrow; Shehata, Medhat H.; Gong, Bill
- Abstract
The durability of three repair materials was investigated under two exposures: freezing-and-thawing cycles in the presence of deicing salts, and substrate undergoing expansion due to alkali-aggregate reaction (AAR). The bond strength of the repairs under freezingand- thawing exposure was evaluated using slant shear, splitting tensile, and pulloff tests. Additionally, the pulloff test was implemented to investigate the bond strength of repairs undergoing expansion due to AAR. Under freezing and thawing, the substrate surface roughness was evaluated and resulted in a higher bond strength under combined shear and compression forces (slant shear test). The results for both exposures showed that the efficacy of a repair could not only be explained based on the net unrestrained length change between the repair and the substrate. While significant autogenous shrinkage of ultra-high-performance concrete (UHPC) can increase the net unrestrained length change, the strength, fibers, and high paste content of such material enhance the bond strength.
- Subjects
ALKALI-aggregate reactions; THAWING; HIGH strength concrete; BOND strengths; FREEZING; EXPANSION &; contraction of concrete; FREEZE-thaw cycles
- Publication
ACI Materials Journal, 2022, Vol 119, Issue 3, p197
- ISSN
0889-325X
- Publication type
Article
- DOI
10.14359/51734614