Experimental study of bond-slip relationships in high-performance self-consolidating concrete with plain steel bars
Autor
Dyba, Marcin
Opublikowane w
Engineering Structures
Numeracja
Vol. 319, 118854
Data wydania
2024
Język
angielski
eISSN
1873-7323
DOI
https://doi.org/10.1016/j.engstruct.2024.118854
Słowa kluczowe
adhesion, bond behavior, bond-slip high-performance concrete, self-consolidating concrete, pull-out test
Abstrakt
Self-consolidating concrete is being used more frequently in structures with high density of reinforcement bars or prestressing strands therefore, it is important to carefully consider whether bond stress-slip relations defined for normal strength concrete can be safely applied to high-strength and self-consolidating concrete. This paper aims to investigate the bond behaviour between plain steel bars and high-performance self-consolidating concrete, with a focus on studying the effect of embedment length and concrete compressive strength on bonding performance. The main parameters that were tested are the active bonded length and the compressive strength of the concrete. The value of adhesive bond stress is discussed, as a factor in determining whether the bar slips against the adhering concrete. Based on the results, it can be observed that the maximum bond stress tends to increase with higher concrete compressive strength, while it decreases with longer embedment length of plain steel bar. Conversely, the adhesive bond tends to increase with longer embedment length and higher concrete compressive strength. The experimental investigations indicate that the bond strength increases proportionally to the square root of the compressive strength of concrete, regardless of the concrete compressive strength. Furthermore, a new bond stress-slip model has been analyzed, which takes into account the initial bond strength (adhesive bond) and the lower convex property to predict the post-peak branch. The model has been compared to the test results, and good agreement has been achieved.
