Experimental and Theoretical Analysis of Flexural Properties of Mortar Beam Reinforced with Coated Carbon-Fiber Textile
Abstract
:1. Introduction
2. Experiment
2.1. Materials
2.2. Direct Pull-Out Test
2.3. Four-Point Bending Test
3. Experimental Results and Discussion
3.1. Pull-Out of Textile Reinforcement in Cement Composites
3.2. Flexural Load–Displacement Response of the TRM
4. Analysis for the Flexural Behavior
4.1. Idealization of the Flexural Behavior
4.2. Stress Distribution and Internal Moment at the Critical Section
4.3. Constitutive Relations
4.4. Analysis Algorithm
4.5. Comparison with the Test Results
5. Conclusions and Discussion
- The bond stress–slip behavior of coated carbon-fiber textile embedded in the cementitious materials was investigated through a double-sided unsymmetrical pull-out test. Test results demonstrated that the adhesion bond in the textile–cement matrix interfacial zone was initially dominant, but the pull-out behavior came to increasingly rely on the bond strength between the textile and the cement matrix as the pull-out displacement increased. The mean maximum bond stress was approximately 13.44 MPa when slip reached approximately 0.92 mm.
- In the four-point bending test for the TRM beam, as the load increased, the dominant flexural crack gradually developed in the bottom-center of the beam specimen. Finally, brittle fracture occurred due to the rupture of the coated carbon-fiber textile exposed to the crack. The load temporarily decreased immediately after cracking, but the load gradually increased until fracture, because the ductility of the TRM beam was secured by the bond behavior of the textile in the tensile zone. The mean ultimate strength of the TRM beam increased by approximately 36% compared to the mean first-crack strength. This confirmed that the textile used was effective as a reinforcement for improving the tensile performance of cementitious materials after cracking.
- A theoretical analysis method capable of predicting the flexural behavior of the TRM beam was established by idealizing the failure mode based on the actual bond behavior of textile reinforcement in cementitious materials. A comparison of measured and predicted results confirmed that the proposed analysis method can effectively predict the flexural behavior of the cracked TRM beam.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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W/C [%] | Cement [kg/m3] | Water [kg/m3] | Sand [kg/m3] | SP 1 [kg/m3] |
---|---|---|---|---|
47 | 480 | 226 | 1625 | 1 |
Cross-Sectional Area [mm2] | Perimeter [mm] | Tensile Strength [MPa] | Young’s Modulus [GPa] | Density [g/cm3] |
---|---|---|---|---|
0.85 | 3.88 | 4300 | 240 | 1.7 |
Specimen | First-Crack Load [kN] | Ultimate Load [kN] | First-Crack Strength [MPa] | Ultimate Strength [MPa] | Ultimate Deflection [mm] | Flexural Toughness [MPa] |
---|---|---|---|---|---|---|
1 | 15.16 | 19.28 | 4.55 | 5.79 | 1.128 | 2.42 |
2 | 11.57 | 22.18 | 3.47 | 6.66 | 1.508 | 3.40 |
3 | 15.02 | 15.13 | 4.49 | 4.54 | 0.657 | 1.66 |
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Hong, G.; Park, J.; Lee, S.-C.; Cha, S.W.; Ryu, J.; Choi, S. Experimental and Theoretical Analysis of Flexural Properties of Mortar Beam Reinforced with Coated Carbon-Fiber Textile. Buildings 2023, 13, 2157. https://doi.org/10.3390/buildings13092157
Hong G, Park J, Lee S-C, Cha SW, Ryu J, Choi S. Experimental and Theoretical Analysis of Flexural Properties of Mortar Beam Reinforced with Coated Carbon-Fiber Textile. Buildings. 2023; 13(9):2157. https://doi.org/10.3390/buildings13092157
Chicago/Turabian StyleHong, Geuntae, Jangsoon Park, Seong-Cheol Lee, Soo Won Cha, Jaewoo Ryu, and Seongcheol Choi. 2023. "Experimental and Theoretical Analysis of Flexural Properties of Mortar Beam Reinforced with Coated Carbon-Fiber Textile" Buildings 13, no. 9: 2157. https://doi.org/10.3390/buildings13092157