Experimental Study on the Bond Performance of Steel–Basalt Fiber Composite Bars in Concrete
Publication: Journal of Composites for Construction
Volume 27, Issue 2
Abstract
Steel–basalt fiber composite bars (SBFCBs) exhibit excellent strength, elastic modulus, toughness, corrosion resistance, and low cost. Understanding the bond performance between SBFCBs and concrete is important for evaluating the mechanical behavior of SBFCB-reinforced concrete structures. In this study, the bond–slip performance of SBFCB in concrete was experimentally assessed via pullout and beam bond tests. The influence of various factors on the bond performance was discussed, and the bond mechanism between SBFCB and concrete was analyzed. The results indicate that reducing the thread pitch ratio in the SBFCB can reduce slippage at the postpeak bonding stress–slip curve. The bond strength of the SBFCB was significantly improved by sandblasting. Longer bond lengths correspond to smaller average bond strengths in SBFCB. The load corresponding to the maximum bond strength of a specimen with a bond length of 10d was determined as the ultimate load value for the SBFCB. An increase in the SBFCB diameter had a negative impact on the bond strength. Moreover, an increase in the concrete cover thickness was conducive to improving the bond strength; if the thickness of the concrete cover was sufficiently increased, failure occurred owing to SBFCB tension rather than bonding. Based on the test results and the existing bond–slip model, a simple bond–slip constitutive model of the SBFCB embedded in concrete was proposed to simulate the pullout process of the SBFCB. Subsequently, the established bond–slip model can be used to analyze the mechanical performance of SBFCB-reinforced concrete structures.
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Acknowledgments
The authors express their gratitude for the financial support provided by the China National Key Research and Development (No. 2021YFB2601000) and the National Natural Science Foundation of China (No. 51778059).
Notation
The following symbols are used in this paper:
- Asb
- cross-sectional area of SBFCB;
- d
- measured diameter of SBFCB;
- dx
- microsegment length;
- dσsb
- stress difference at both ends of SBFCB in microsegment;
- EI
- elastic modulus of SBFCB before yielding;
- EII
- elastic modulus of SBFCB after yielding;
- F
- pullout force;
- Fn
- vertical force of rib slope;
- fsfu
- ultimate strength of SBFCB;
- fsfy
- yield strength of SBFCB;
- ft
- ultimate tensile strength of concrete;
- la
- bond length of SBFCB;
- l1
- horizontal distance from beam bearing to hinge support center;
- l2
- horizontal distance from loading point to hinge support center;
- P
- beam load;
- rb
- radius of SBFCB;
- ru
- radius of the plastic region of concrete;
- r0
- radius of the elastic region of concrete;
- s0
- bond–slip at residual bond stress;
- s1
- initial bond–slip;
- s2
- bond–slip at maximum bond stress;
- s3
- bond–slip at residual bond stress;
- s5
- bond–slip at minimum bond stress;
- α
- fitting parameter of the slip stage (α < 1);
- β
- fitting parameter of the slip stage (β > 1);
- ɛsfu
- ultimate strain of SBFCB;
- ɛsfy
- yield strain of SBFCB;
- γ
- angle between the diagonal section and longitudinal direction of ribs;
- μ
- friction coefficient between rebar and surrounding concrete;
- σ
- extrusion pressure;
- σc
- opposite extrusion pressure;
- σcf
- tensile strength of concrete;
- σf
- shear stress of the diagonal section of the ribs;
- σr
- radial stress of concrete;
- σsb
- stress of SBFCB;
- σsf
- normal stress of the diagonal section of the ribs;
- σx
- shear stress on the bond surface;
- σr,0
- normal stress on the bond surface;
- circumferential stress of concrete;
- τ
- bond stress;
- τu
- maximum bond strength;
- τ0
- residual bond strength;
- τ1
- bond stress at the initial slip point;
- τ2
- maximum bond stress;
- τ3
- residual bond stress; and
- τ5
- minimum bond stress.
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Published In
Journal of Composites for Construction
Volume 27 • Issue 2 • April 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: May 19, 2021
Accepted: Sep 29, 2022
Published online: Dec 22, 2022
Published in print: Apr 1, 2023
Discussion open until: May 22, 2023
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Cited by
- Emad E. Etman, Mohamed H. Mahmoud, Ali Hassan, Mohamed H. Mowafy, Flexural behaviour of concrete beams reinforced with steel-FRP composite bars, Structures, 10.1016/j.istruc.2023.02.098, 50, (1147-1163), (2023).