Title:
Comparability of bond tests for repair and retrofit of concrete structures with Fiber Reinforced Concrete
Author(s):
Zanotti, C.; Randl, N.; Gar, P.S.; Far, B.K.; Steiner, M.
Publication:
Symposium Paper
Volume:
343
Issue:
Appears on pages(s):
381-390
Keywords:
Bond test, Repair, Bond strength, Shear bond, Tensile bond, Adhesion, Friction, Fiber reinforced concrete, High strength concrete, Roughness
DOI:
Date:
10/1/2020
Abstract:
Fiber Reinforced Concrete (FRC) is being increasingly applied in structural repair and
retrofit of reinforced concrete structures. Not only fiber reinforcement improves the durability
of reinforced concrete structures, but it also enhances compatibility of the repair material to
the existing structure, further enhancing structural effectiveness and service life of the
intervention. Furthermore, studies have shown that fiber reinforcement can significantly
improve substrate-repair bond in both tension and shear. However, this benefit is not fully
utilized in repair/retrofit design due to test uncertainties and lack of comprehensive data on
correlations with other fundamental factors. In this study, the question of the appropriateness,
reliability and sensitivity of current bond tests in case of FRC repairs is addressed. Several
tension and shear bond tests on plain and fiber reinforced cement-based repairs are performed
in parallel by two research teams at UBC (Canada) and CUAS (Austria), following a rigorous
testing procedure to allow consistency among results from the two laboratories. The influence
of repair strength and casting direction is also investigated. The effect of fiber reinforcement
on bond is assessed while correlation, comparability, and sensitivity of different test set-ups
and stress conditions are discussed.