Comparative Investigation on Tensile Performance of FRP Bars after Exposure to Water, Seawater, and Alkaline Solutions
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 7
Abstract
This paper presents experimental investigations to compare the effect of three environmental solutions on the degradation of tensile performance of fiber reinforced polymer (FRP) bars. Three kinds of FRP bars, basalt FRP (BFRP), carbon FRP (CFRP), and E-glass FRP (GFRP), were tested in tension after conditioning in tap water, artificial seawater, and alkaline solutions at room temperature for different exposure periods of 0, 45, 90, 135, and 180 days. The test results showed that the changes of the surface appearance of GFRP bars were more obvious that those of BFRP and CFRP bars after 180 days of exposure to three environmental solutions. The tensile failure mode and load-displacement curves of all tested FRP bars exhibited similar characters regardless of the immersion solution, the exposure period, or type of FRP bars. By comparing the residual mechanical properties of three kinds of FRP bars tested in this study, it has been found that the chemical attack of harsh environments simulated by immersion in seawater solution and alkaline solution resulted in a significant damage to BFRP bars. The effect of the seawater solution on the strength loss of CFRP bars was more obvious than those of the other two solutions. While the alkaline solution caused the greatest strength damage on GFRP bars. These findings were in accordance with the properties of material susceptibility to aggressive solutions and the moisture absorption of the matrix. No significant degradation of the elastic modulus of the three kinds of FRP bars had been found after exposure to aggressive solutions because their glass transition temperatures were kept unchanged in the experiment. Finally, based on the Arrhenius theory, the time-dependent tensile strength retention of all tested FRP bars exposed to the three aggressive solutions were fitted with experimental data obtained in this study. They were also compared with various test results collected from previous studies. The comparison results indicated that our experimental data were in good agreement with the predictions and most of the existing results.
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Data Availability Statement
The following data, models, or code generated or used during the study are available from the corresponding author by request: the data of the moisture uptake of tested FRP bars; the data of the heat flow first derivative of tested FRP bars in the DSC analysis; and the data of the load-displacement curves of tested FRP bars.
Acknowledgments
The authors wish to acknowledge the financial support provided by the National Natural Science Foundation of PR China (Grant Nos. 51578267 and 51878319) and the “Six Talent Peaks” project in Jiangsu Province (Grant No. 2015-JZ-008). Support from the Graduate Research and Innovation Projects of Jiangsu Province (SJCX180752) is also acknowledged.
References
ACI (American Concrete Institute). 2004. Guide test methods for fiber reinforced polymers (FRPs) for reinforcing or strengthening concrete structures. ACI 440.3R-04. Farmington Hills, MI: ACI.
Ali, A. H., H. M. Mohamed, B. Benmokrane, A. ElSafty, and O. Chaallal. 2019. “Durability performance and long-term prediction models of sand-coated basalt FRP bars.” Compos. Part B. 157 (Jan): 248–258. https://doi.org/10.1016/j.compositesb.2018.08.065.
Al-Salloum, Y. A., S. El-Gamal, T. H. Almusallam, S. H. Alsayed, and M. Aqel. 2013. “Effect of harsh environmental conditions on the tensile properties of GFRP bars.” Compos. Part B. 45 (1): 835–844. https://doi.org/10.1016/j.compositesb.2012.05.004.
ASTM. 2014a. Standard test method for assignment of the glass transition temperatures by differential scanning calorimetry. West Conshohocken, PA: ASTM.
ASTM. 2014b. Standard test method for moisture absorption properties and equilibrium conditioning of polymer matrix composite materials. West Conshohocken, PA: ASTM.
ASTM. 2014c. Standard test method for rust-preventing characteristics of inhibited mineral oil in the presence of water. West Conshohocken, PA: ASTM.
Behnam, B., and C. Eamon. 2013. “Reliability-based design optimization of concrete flexural members reinforced with ductile FRP bars.” Constr. Build. Mater. 47 (5): 942–950. https://doi.org/10.1016/j.conbuildmat.2013.05.101.
Chen, Y., J. F. Davalos, and I. Ray. 2006. “Durability prediction for GFRP reinforcing bars using short-term data of accelerated aging tests.” J. Compos. Constr. 10 (10): 279–286. https://doi.org/10.1061/(ASCE)1090-0268(2006)10:4(279).
Chen, Y., J. F. Davalos, I. Ray, and H. Y. Kim. 2007. “Accelerated aging tests for evaluations of durability performance of FRP reinforcing bars for concrete structures.” Compos. Struct. 78 (1): 101–111. https://doi.org/10.1016/j.compstruct.2005.08.015.
Chu, W., L. Wu, and V. M. Karbhari. 2004. “Durability evaluation of moderate temperature cured E-glass/vinylester systems.” Compos. Struct. 66 (1–4): 367–376. https://doi.org/10.1016/j.compstruct.2004.04.058.
D’Antino, T., and M. A. Pisani. 2018. “Influence of sustained stress on the durability of glass FRP reinforcing bars.” Constr. Build. Mater. 187 (Oct): 474–486. https://doi.org/10.1016/j.conbuildmat.2018.07.175.
D’Antino, T., M. A. Pisani, and C. Poggi. 2018. “Effect of the environment on the performance of GFRP reinforcing bars.” Compos. Part B. 141 (May): 123–136. https://doi.org/10.1016/j.compositesb.2017.12.037.
Davalos, J. F., Y. Chen, and I. Ray. 2012. “Long-term durability prediction models for GFRP bars in concrete environment.” J. Compos. Mater. 46 (16): 1899–1914. https://doi.org/10.1177/0021998311427777.
El-Hassan, H., T. El-Maaddawy, A. Al-Sallamin, and A. Al-Saidy. 2018. “Durability of glass fiber-reinforced polymer bars conditioned in moist seawater-contaminated concrete under sustained load.” Constr. Build. Mater. 175 (Jun): 1–13. https://doi.org/10.1016/j.conbuildmat.2018.04.107.
Fergani, H., M. D. Benedetti, C. M. Oller, C. Lynsdale, and M. Guadagnini. 2018. “Durability and degradation mechanisms of GFRP reinforcement subjected to severe environments and sustained stress.” Constr. Build. Mater. 170 (May): 637–648. https://doi.org/10.1016/j.conbuildmat.2018.03.092.
Ge, W., J. Zhang, D. Cao, and Y. Tu. 2015. “Flexural behaviors of hybrid concrete beams reinforced with BFRP bars and steel bars.” Constr. Build. Mater. 87 (Jul): 28–37. https://doi.org/10.1016/j.conbuildmat.2015.03.113.
Gjørv, O. E. 2014. Durability design of concrete structures in severe environments. 2nd ed. Boca Raton, FL: CRC Press, Taylor & Francis Group.
Hwang, J. H., D. W. Seo, K. T. Park, and Y. J. You. 2014. “Experimental study on the mechanical properties of FRP Bars by hybridizing with steel wires.” Engineering. 06 (7): 365–373. https://doi.org/10.4236/eng.2014.67039.
Ibrahim, A. M. A., M. F. M. Fahmy, and Z. Wu. 2016. “3D finite element modeling of bond-controlled behavior of steel and basalt FRP-reinforced concrete square bridge columns under lateral loading.” Compos. Struct. 143 (May): 33–52. https://doi.org/10.1016/j.compstruct.2016.01.014.
Kim, H. Y., Y. H. Park, Y. J. You, and C. K. Moon. 2008. “Short-term durability test for GFRP rods under various environmental conditions.” Compos. Struct. 83 (1): 37–47. https://doi.org/10.1016/j.compstruct.2007.03.005.
Li, G., J. Wu, and W. Ge. 2015. “Effect of loading rate and chemical corrosion on the mechanical properties of large diameter glass/basalt-glass FRP bars.” Constr. Build. Mater. 93 (Sep): 1059–1066. https://doi.org/10.1016/j.conbuildmat.2015.05.044.
Lu, C. H., J. M. Yang, H. Li, and R. G. Liu. 2017a. “Experimental studies on chloride penetration and steel corrosion in cracked concrete beams under drying-wetting cycles.” J. Mater. Civ. Eng. 29 (9): 04017114. https://doi.org/10.1061/(ASCE)MT.1943-5533.0001953.
Lu, C. H., S. Q. Yuan, P. Cheng, and R. G. Liu. 2016. “Mechanical properties of corroded steel bars in pre-cracked concrete suffering from chloride attack.” Constr. Build. Mater. 123 (Oct): 649–660. https://doi.org/10.1016/j.conbuildmat.2016.07.032.
Lu, C. H., S. Q. Yuan, and R. G. Liu. 2017b. “Experimental and probabilistic analysis of time to corrosion-induced cover cracking for marine reinforced concrete structures.” Corros. Eng. Sci. Technol. 52 (2): 124–133. https://doi.org/10.1080/1478422X.2016.1213082.
Micelli, F., and M. A. Aiello. 2019. “Residual tensile strength of dry and impregnated reinforcement fibres after exposure to alkaline environments.” Compos. Part B. 159 (Feb): 490–501. https://doi.org/10.1016/j.compositesb.2017.03.005.
Micelli, F., M. Corradi, M. A. Aiello, and A. Borri. 2017. “Properties of aged GFRP reinforcement grids related to fatigue life and alkaline environment.” Appl. Sci. 7 (9): 897. https://doi.org/10.3390/app7090897.
Micelli, F., and A. Nanni. 2004. “Durability of FRP rods for concrete structures.” Constr. Build. Mater. 18 (7): 491–503. https://doi.org/10.1016/j.conbuildmat.2004.04.012.
Nkurunziza, G., B. Benmokrane, A. S. Debaiky, and R. Masmoudi. 2005. “Effect of sustained load and environment on long-term tensile properties of glass fiber-reinforced polymer reinforcing bars.” ACI Struct. J. 102 (4): 615–621. https://doi.org/10.14359/14566.
Robert, M., and B. Benmokrane. 2013. “Combined effects of saline solution and moist concrete on long-term durability of GFRP reinforcing bars.” Constr. Build. Mater. 38 (1): 274–284. https://doi.org/10.1016/j.conbuildmat.2012.08.021.
Robert, M., P. Cousin, and B. Benmokrane. 2009. “Durability of GFRP reinforcing bars embedded in moist concrete.” J. Compos. Constr. 13 (2): 66–73. https://doi.org/10.1061/(ASCE)1090-0268(2009)13:2(66).
Sagüés, A. A., K. Lau, R. G. Powers, and R. J. Kessler. 2010. “Corrosion of epoxy-coated rebar in marine bridges-Part 1: A 30-year perspective.” Corrosion 66 (6): 0650011. https://doi.org/10.5006/1.3452397.
Serbescu, A., M. Guadagnini, and K. Pilakoutas. 2015. “Mechanical characterization of basalt FRP rebars and long-term strength predictive model.” J. Compos. Constr. 19 (2): 04014037. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000497.
Shi, J., X. Wang, Z. Wu, and Z. Zhu. 2017. “Fatigue behavior of basalt fiber-reinforced polymer bars under a marine environment.” Constr. Build. Mater. 137: 46–54. https://doi.org/10.1016/j.conbuildmat.2017.01.063.
Silva, M. A. G., B. S. D. Fonseca, and H. Biscaia. 2014. “On estimates of durability of FRP based on accelerated tests.” Compos. Struct. 116 (9): 377–387. https://doi.org/10.1016/j.compstruct.2014.05.022.
Wang, Z., X. L. Zhao, G. Xian, G. Wu, R. K. S. Raman, and S. Al-Saadi. 2018. “Effect of sustained load and seawater and sea sand concrete environment on durability of basalt- and glass-fibre reinforced polymer (B/GFRP) bars.” Corros. Sci. 138 (Jul): 200–218. https://doi.org/10.1016/j.corsci.2018.04.002.
Wang, Z., X. L. Zhao, G. Xian, G. Wu, R. K. S. Raman, S. Al-Saadi, and A. Haque. 2017. “Long-term durability of basalt- and glass-fibre reinforced polymer (BFRP/GFRP) bars in seawater and sea sand concrete environment.” Constr. Build. Mater. 139 (May): 467–489. https://doi.org/10.1016/j.conbuildmat.2017.02.038.
Won, J. P., S. J. Lee, Y. J. Kim, C. I. Jang, and S. W. Lee. 2008. “The effect of exposure to alkaline solution and water on the strength–porosity relationship of GFRP rebar.” Compos. Part B. 39 (5): 764–772. https://doi.org/10.1016/j.compositesb.2007.11.002.
Wu, G., Z. Q. Dong, X. Wang, Y. Zhu, and Z. S. Wu. 2015. “Prediction of long-term performance and durability of BFRP bars under the combined effect of sustained load and corrosive solutions.” J. Compos. Constr. 19 (3): 04014058. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000517.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 7 • July 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Sep 3, 2019
Accepted: Dec 27, 2019
Published online: Apr 24, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 24, 2020
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