Influence of Fiber Volume Fraction and Fiber Orientation on the Uniaxial Tensile Behavior of Rebar-Reinforced Ultra-High Performance Concrete
Abstract
:1. Introduction
2. Brittle Failure of Reinforced Strain-Hardening UHPC?
3. Materials and Methods
3.1. Materials
3.1.1. Rebar–Characterization
3.1.2. UHPC–Material Design and Characterization
3.2. Uniaxial Tensile Test of Rebar-Reinforced UHPC
3.2.1. Test Specimen Design
3.2.2. Test Matrix
3.2.3. Specimen Preparation
3.2.4. Testing
4. Results and Discussion
4.1. Peak Stress and Calculated UHPC Contribution
4.1.1. Effect of
4.1.2. Effect of Fiber Orientation
4.1.3. Effect of Rebar Type
4.2. Stress versus Strain Response
4.2.1. Effect of
Recommendation for
4.2.2. Effect of Fiber Orientation
4.2.3. Effect of Rebar Type
4.3. Failure Pattern
4.3.1. Effect of
4.3.2. Effect of Fiber Orientation
4.3.3. Effect of Rebar Type
5. Conclusions
- In general, the composite tensile strength increased with the increase in fiber volume fraction for a given rebar type and fiber orientation.
- For a given rebar type and fiber volume fraction, the UHPC with fibers oriented parallel to the load direction showed the highest peak tensile stress and the UHPC with fibers oriented perpendicular to the load direction recorded the lowest peak stress. The peak stress values with random fibers laid in between.
- UHPC with A1035 rebars recorded higher tensile stress as compared to UHPC with A615 rebars for a particular fiber volume fraction and parallel orientation of fibers.
- Average stress versus strain curves showed that the modulus of the composite in the strain-hardening region increased with the increase in fiber content. However, ductility of the composite decreased with the increase in fiber volume fraction beyond a certain value. In order to achieve enhanced ductility, it is recommended that the UHPC composite attains a minimum strain of 1% at peak stress. Using the reinforcement ratio (0.9%) in the present study, it is recommended to use UHPC with 0.5–0.75% fibers along with A1035 bars.
- For a particular fiber volume fraction and type of rebar, the strain-hardening modulus recorded the maximum value for the composite with parallel fibers and the minimum value for the composite with perpendicular fibers. The value for random fiber orientation was in between.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Bar Type | Modulus of Elasticity (MPa) | Yield Stress (MPa) | Ultimate Stress (MPa) | |
---|---|---|---|---|
A615 | 208,078 | 457 | 719 | 1.57 |
A1035 | 221,858 | 700 | 1102 | 1.57 |
Mixture Proportions | Compressive Strength (MPa) | |||
---|---|---|---|---|
Ingredients | Quantity (kg/m3) | Age of Concrete During Testing (day) | 0% Fiber | 2% Fiber |
Premix | 2195 | 7 | 126.9 | 122.6 |
Water | 120 | 14 | 161.0 | 162.0 |
Superplasticizer | 30 | 28 | 172.7 | 176.1 |
Steel Fibers (2%) | 156 | - | - | - |
Fiber Volume Fraction | Fiber Orientation | Parallel | Perpendicular | Random | |||
---|---|---|---|---|---|---|---|
Rebar 1 Type | A1035 | A615 | A1035 | A615 | A1035 | A615 | |
0.5 | 1 | 1 | - | - | 1 | - | |
0.75 | 1 | 2 | - | - | - | - | |
1.0 | 2 | 2 | 1 | 1 | 1 | 1 | |
2.0 | 1 | 2 | - | - | 1 | - | |
3.0 | 1 | - | - | - | 1 | - |
Specimen | a | b | Crack Width (mm) | |
---|---|---|---|---|
1%-par-A1035 | 28.5 | 1.9 | 0.15 c | (Equation (1)) |
1%-par-A1035 | 28.5 | 5.7 | 0.4 d | (Equation (1)) |
3%-par-A1035 | 28.5 | 5.1 | 0.15 c | (Equation (1)) |
3%-par-A1035 | 28.5 | 40.0 | 0.4 d | (Equation (2)) |
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Roy, M.; Hollmann, C.; Wille, K. Influence of Fiber Volume Fraction and Fiber Orientation on the Uniaxial Tensile Behavior of Rebar-Reinforced Ultra-High Performance Concrete. Fibers 2019, 7, 67. https://doi.org/10.3390/fib7070067
Roy M, Hollmann C, Wille K. Influence of Fiber Volume Fraction and Fiber Orientation on the Uniaxial Tensile Behavior of Rebar-Reinforced Ultra-High Performance Concrete. Fibers. 2019; 7(7):67. https://doi.org/10.3390/fib7070067
Chicago/Turabian StyleRoy, Manish, Corey Hollmann, and Kay Wille. 2019. "Influence of Fiber Volume Fraction and Fiber Orientation on the Uniaxial Tensile Behavior of Rebar-Reinforced Ultra-High Performance Concrete" Fibers 7, no. 7: 67. https://doi.org/10.3390/fib7070067