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Non-Metallic Reinforcements with Different Moduli of Elasticity and Surfaces for Concrete Structures

Sandor SOLYOM
Sandor SOLYOM
, 
Matteo DI BENEDETTI
Matteo DI BENEDETTI
, 
Anna SZIJÁRTÓ
Anna SZIJÁRTÓ
 und 
György L. BALÁZS
György L. BALÁZS
   | 04. Apr. 2019
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Online veröffentlicht: 04. Apr. 2019
Seitenbereich: 79 - 88
Eingereicht: 25. Juni 2017
Akzeptiert: 16. März 2018
DOI: https://doi.org/10.21307/acee-2018-025
Schlüsselwörter
© 2018 Sandor Solyom et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Schematic representation of the pull-out specimen
Schematic representation of the pull-out specimen

Figure 2.

Left: CFRP and GFRP sand coated bars prepared with 5Ø (Ø – bar diameter) embedment length. Right: pull-out test setup
Left: CFRP and GFRP sand coated bars prepared with 5Ø (Ø – bar diameter) embedment length. Right: pull-out test setup

Figure 3.

Effect of modulus of elasticity of FRP bars on bond strength in concrete
Effect of modulus of elasticity of FRP bars on bond strength in concrete

Figure 4.

Bond stress-slip relationships of GFRP bars with different surface profiles
Bond stress-slip relationships of GFRP bars with different surface profiles

Figure 5.

Effect of surface profile of GFRP bars on bond strength. Eccentricity (left) and centric (right) pull-out test
Effect of surface profile of GFRP bars on bond strength. Eccentricity (left) and centric (right) pull-out test

Analysis of variance (ANOVA) between bond strength results of CFRP and GFRP bars

Concrete mix Significance level (%)
C1 11.2
C2 3.9
C3 29.7
S1 8.3

Mechanical characteristics of concrete mixes (MPa)

Symbol Compressive str. Splitting tensile str.
Avg. St.D. Avg. St.D.
C1 39.14 1.26 2.91 0.36
C2 48.80 1.10 3.40 0.33
C3 54.21 1.50 3.72 0.19
S1 67.16 3.57 4.13 0.08

Pull-out test results for Series 2

Symbol Bond strength Loaded end slip Free end slip Bond stiffness
τb,max Avg. St.D. C.O.V. Slip a Avg. St.D. C.O.V. Slip a Avg. St.D. C.O.V. Avg.
(MPa) (MPa) (MPa) (%) (mm) (mm) (mm) (%) (mm) (mm) (mm) (%) (N/mm3)
Sand coated 1 23.24 23.01 0.57 2.5 0.718 0.638 0.088 13.7 0.266 0.247 0.024 9.8 36.05
2 22.36 0.545 0.256
3 23.43 0.652 0.220
Indented type 1 20.02 18.91 1.17 6.2 0.581 0.606 0.148 24.4 0.317 0.319 0.068 21.3 31.19
2 17.69 0.473 0.252
3 19.03 0.765 0.388
Indented type 2 1 11.21 12.25 1.29 10.5 1.138 1.198 0.103 8.6 0.957 0.917 0.069 7.5 10.23
2 11.84 1.138 0.957
3 13.69 1.316 0.838

Pull-out test results, CFRP sand coated #3 (9.52 mm diameter) bars

Symbol Bond strength Loaded end slip Free end slip Bond stiffness
τb,max Avg. St.D. C.O.V. Slip a Avg. St.D. C.O.V. Slip a Avg. St.D. C.O.V. Avg.
(MPa) (MPa) (MPa) (%) (mm) (mm) (mm) (%) (mm) (mm) (mm) (%) (N/mm3)
C1 1 19.82 19.31 1.27 6.5 0.261 0.234 0.034 14.5 0.130 0.100 0.038 38.2 82.61
2 20.25 0.196 0.112
3 17.86 0.245 0.057
C2 1 14.30 15.57 1.54 9.9 0.163 0.259 0.125 48.1 0.038 0.051 0.011 22.5 60.18
2 17.29 0.213 0.054
3 15.14 0.400 0.060
C3 1 12.60 15.95 4.74 29.7 0.291 0.245 0.065 26.5 0.067 0.065 0.004 5.5 65.15
2 19.30 0.199 0.062
S1 1 16.47 16.30 0.97 6.0 0.358 0.260 0.095 36.4 0.036 0.038 0.002 5.4 62.58
2 15.25 0.254 0.039
3 17.18 0.169 0.040

Pull-out test results, GFRP sand coated #3 (9.52 mm diameter) bars

Symbol Bond strength Loaded end slip Free end slip Bond stiffness
τb,max Avg. St.D. C.O.V. Slip a Avg. St.D. C.O.V. Slip a Avg. St.D. C.O.V. Avg.
(MPa) (MPa) (MPa) (%) (mm) (mm) (mm) (%) (mm) (mm) (mm) (%) (N/mm3)
C1 1 12.87 14.11 4.26 30.2 0.397 0.406 0.156 38.3 0.038 0.075 0.052 69.5 34.76
2 18.85 0.566 0.134
3 10.60 0.255 0.052
C2 1 9.54 9.16 0.74 8.1 0.255 0.256 0.069 27.0 0.040 0.026 0.012 48.0 35.74
2 8.30 0.188 0.022
3 9.63 0.326 0.016
C3 1 8.21 13.03 6.82 52.3 0.238 0.374 0.192 51.4 0.034 0.054 0.028 52.4 34.87
2 17.86 0.509 0.074
S1 1 9.24 10.97 2.44 22.3 0.297 0.297 0.001 0.2 0.044 0.057 0.018 32.3 36.98
2 12.70 0.296 0.070
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