Flexural Characteristics of Functionally Graded Fiber-Reinforced Cementitious Composite with Polyvinyl Alcohol Fiber
2. Experimental Program
2.1. Tested FRCC
2.3. Specimen Fabrication
2.4. Loading and Measurement
3. Experimental Results
3.1. Failure Pattern
3.2. Load–Deflection Curve
3.3. Maximum Load
4. Section Analysis and Comparison with Experimental Results
4.1. Method of Section Analysis
4.2. Comparison of Maximum Bending Moment
- Clear separation between layers in the FG-FRCC was not observed in the four-point bending test. It is considered that the bond between layers is enough to transmit shear stress under pure bending by the pouring fabrication method for PVA-FRCC having self-consolidating properties.
- The maximum load of the FG-FRCC specimens exhibited almost twice that of the homogeneous specimens, even when the average of fiber volume fraction in whole specimen is 1%.
- The ratio of the maximum load of the three-layered specimens with the same fiber volume fraction to that of the homogeneous specimens is 1.02 and 1.08 for the 1% and 2% volume fractions, respectively. The thinner thickness may be required to show the more effective contribution of the layer causing the two-dimensional fiber orientation.
- Section analysis, in which the stress–strain models based on the bridging law considering the fiber orientation effect was conducted. The ratio of the experimental maximum moment to the analysis result ranges from 0.89 to 1.18. It is considered that the section analysis result considering the fiber orientation shows a good adaptability with the experiment result.
- The analysis result shows that the maximum moment of the FG-FRCC specimen is 1.63 times that of the homogeneous specimen with the same whole fiber volume fraction of 1%. It is considered that the bending moment reaches the maximum when the tensile force in the tension side layer becomes maximum in the case of the FG-FRCC.
Data Availability Statement
Conflicts of Interest
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|Unit Weight (kg/m3)|
|Cement: High early strength Portland cement|
|Fly ash: Type II of Japanese Industrial Standard (JIS A 6201) |
|Sand: Size under 0.2 mm|
|High-range water-reducing admixture: Binder × 0.6%|
|Specimen ID||Remarks||Fiber Volume Fraction,|
|Number of Specimens|
|1st day||FG-FRCC||Functionally graded||0, 1, 2%||3 for each parameter|
|2nd day||Layer-1%||Three-layer||1%||3 for each parameter|
|Experiment||Section Analysis||Ratio of Experiment to Analysis|
|Max. Bending Moment|
|Max. Bending Moment|
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Kanakubo, T.; Koba, T.; Yamada, K. Flexural Characteristics of Functionally Graded Fiber-Reinforced Cementitious Composite with Polyvinyl Alcohol Fiber. J. Compos. Sci. 2021, 5, 94. https://doi.org/10.3390/jcs5040094
Kanakubo T, Koba T, Yamada K. Flexural Characteristics of Functionally Graded Fiber-Reinforced Cementitious Composite with Polyvinyl Alcohol Fiber. Journal of Composites Science. 2021; 5(4):94. https://doi.org/10.3390/jcs5040094Chicago/Turabian Style
Kanakubo, Toshiyuki, Takumi Koba, and Kohei Yamada. 2021. "Flexural Characteristics of Functionally Graded Fiber-Reinforced Cementitious Composite with Polyvinyl Alcohol Fiber" Journal of Composites Science 5, no. 4: 94. https://doi.org/10.3390/jcs5040094