Title:
Bond Stress of High-Performance Concrete to 7.5 mm Indented Steel Wire
Author(s):
Andrzej Seruga and Marcin Dyba
Publication:
Structural Journal
Volume:
122
Issue:
2
Appears on pages(s):
71-86
Keywords:
bond behavior; bond stress-slip relationship; high-performance concrete (HPC); indented steel wire; modified pullout test
DOI:
10.14359/51743294
Date:
3/1/2025
Abstract:
The paper investigates the bond behavior between non-pretensioned indented steel wire and high-performance concrete (HPC) to study the effect of embedment length and concrete compressive strength on bonding performance with time. A total of 63 concrete specimens, cross section of 160 x 160 mm reinforced with indented steel wire of 7.5 mm diameter, were cast and tested under uniaxial load. The main test parameters included the embedment lengths: 40, 80, 120, 200, and 240 mm, and concrete compressive strengths: 40, 60, 72, and 88 MPa. The modified pullout test method developed at the Cracow University of Technology was used in the experimental investigation.
The results show that the average maximum bond stress (16, 23, 26, and 32 MPa) is increased with an increase of concrete compressive strength (over time) and is decreased with longer development length of indented steel wire for the same concrete compressive strength. An increase of bond stress is slower than an increase of HPC compressive strength. Moreover, it was demonstrated that the maximum bond stress occurs at the slip of 2.8 mm, independently of concrete compressive strength ranging from 40 to 88 MPa. The average values of the adhesive bond of HPC to non-pretensioned indented steel wire range from 2.90 to 3.75 MPa.
Finally, a verification of the fib Model Code 2010 concrete bond-slip model for HPC reinforced with non-pretensioned indented steel wires was conducted. It was determined that the model is not applicable to elements made of concrete with a strength of 60 MPa and above.
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