Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2023 , Vol. 57 >Issue 2: 148 - 160

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2022.034

Naval Architecture, Ocean and Civil Engineering

Effects of Relative Humidity on Tensile Property Degradation of GFRP Rebars in Seawater and Sea Sand Concrete Environment

Expand
  • School of Naval Architecture, Ocean and Civil Engineering; State Key Laboratory of Ocean Engineering; Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, Shanghai Jiao Tong University, Shanghai 200240, China

Received date: 2022-02-16

  Revised date: 2022-06-14

  Accepted date: 2022-06-30

  Online published: 2022-08-23

Fold

Abstract

By establishing a quantitative analysis method of relative humidity, pore solution saturation, and corrosion reaction rate of concrete, the influence of environmental relative humidity on the mechanical properties of glass fiber reinforced polymer (GFRP) in seawater sea-sand concrete environment has been studied. Based on the pore size distribution of concrete and the surface tension formula of pore solution, the relationship between the relative humidity and pore solution saturation of seawater sea-sand concrete is established. It is assumed that the pore solution is uniformly smeared in concrete. Therefore, the concentration of corrosive ion OH- can be obtained. The corrosion rate and strength retention rate of GFRP bars under the action of OH- are evaluated using the etching model. The accuracy of the current method is verified by experimental results. Based on the climate statistics of some coastal cities in China, the influence of relative humidity on the strength retention rate of GFRP bars in seawater and sea sand concrete environment is predicted under the conditions of representative ambient temperature and water-cement ratio. The increase of relative humidity promotes the performance degradation of GFRP bars. According to relevant standards, the relations between relative humidity and service life of GFRP bars in seawater sea-sand concrete environment have been predicted.

Key words： composites; seawater and sea sand concrete; relative humidity; property degradation; service life

Cite this article

WANG Wenhua, ZHAO Qi, ZHANG Daxu, ZHANG Peifu, CHEN Peng . Effects of Relative Humidity on Tensile Property Degradation of GFRP Rebars in Seawater and Sea Sand Concrete Environment[J]. Journal of Shanghai Jiaotong University, 2023 , 57(2) : 148 -160 . DOI: 10.16183/j.cnki.jsjtu.2022.034

References

[1] MASUELLI M. Fiber reinforced polymers: The technology applied for concrete repair[M]. London: IntechOpen, 2013: 1-3.
[2] WANG Z, ZHAO X L, XIAN G, et al. Long-term durability of basalt-and glass-fibre reinforced polymer (BFRP/GFRP) bars in seawater and sea sand concrete environment[J]. Construction and Building Materials, 2017, 139: 467-89.
[3] GUO F, AL-SAADI S, SINGH RAMAN R K, et al. Durability of fiber reinforced polymer (FRP) in simulated seawater sea sand concrete (SWSSC) environment[J]. Corrosion Science, 2018, 141: 1-13.
[4] WANG X, JIANG L, SHEN H, et al. Long-term performance of pultruded basalt fiber reinforced polymer profiles under acidic conditions[J]. Journal of Materials in Civil Engineering, 2018, 30(6): 1-11.
[5] 董志强, 吴刚. FRP筋增强混凝土结构耐久性能研究进展[J]. 土木工程学报, 2019, 52(10): 1-19.
[5] DONG Zhiqiang, WU Gang. Research progress on durability of FRP bars reinforced concrete structures[J]. Chinese Journal of Civil Engineering, 2019, 52(10): 1-19.
[6] SHARMA S, ZHANG D, ZHAO Q. Degradation of basalt fiber-reinforced polymer bars in seawater and sea sand concrete environment[J]. Advances in Mechanical Engineering, 2020, 12(3): 1-11.
[7] ZHAO Q, ZHANG D, ZHAO X L, et al. Modelling damage evolution of carbon fiber-reinforced epoxy polymer composites in seawater sea sand concrete environment[J]. Composites Science and Technology, 2021, 215: 1-12.
[8] IQBAL M, ZHANG D, JALAL F E, et al. Computational AI prediction models for residual tensile strength of GFRP bars aged in the alkaline concrete environment[J]. Ocean Engineering, 2021, 232: 1-12.
[9] IQBAL M, ZHANG D, JALAL F E. Durability evaluation of GFRP rebars in harsh alkaline environment using optimized tree-based random forest model[J]. Journal of Ocean Engineering and Science, 2021, 18(9): 1-12.
[10] CHANG Y, WANG Y, WANG M, et al. Bond durability and degradation mechanism of GFRP bars in seawater sea-sand concrete under the coupling effect of seawater immersion and sustained load[J]. Construction and Building Materials, 2021, 307: 1-17.
[11] YI Y, GUO S, LI S, et al. Effect of alkalinity on the shear performance degradation of basalt fiber-reinforced polymer bars in simulated seawater sea sand concrete environment[J]. Construction and Building Materials, 2021, 299: 1-13.
[12] MAEKAWA K, ISHIDA T, KISHIK T. Multi-scale modeling of structural concrete[M]. 2nd ed. London and New York: Taylor & Francis, 2009: 5-13.
[13] MUKHERJEE A, ARWIKAR S J. Performance of glass fiber-reinforced polymer reinforcing bars in tropical environments — Part II: Microstructural tests[J]. ACI Structural Journal, 2005, 102: 816-22.
[14] 刘文博. 混凝土环境中GFRP筋劣化机制研究[J]. 建材与装饰, 2020, 19: 100+103.
[14] LIU Wenbo. Research on deterioration mechanism of GFRP bars in concrete environment[J]. Building Materials and Decoration, 2020, 19: 100+103.
[15] HUANG Q, JIANG Z, GU X, et al. Numerical simulation of moisture transport in concrete based on a pore size distribution model[J]. Cement and Concrete Research, 2015, 67: 31-43.
[16] XI Y, BAZANT Z P, JENNINGS H M. Moisture diffusion in cementitious materials adsorption isotherms[J]. Advanced Cement Based Materials, 1994: 248-257.
[17] AL-ORAIMI S K, TAHA R, HASSAN H F. The effect of the mineralogy of coarse aggregate on the mechanical properties of high-strength concrete[J]. Construction and Building Materials, 2006, 20(7): 499-503.
[18] MEHTA P K, MONTEIRO P J M. Concrete: Microstructure, properties, and materials[M]. 4th ed. New York: McGraw-Hill Education, 2014: 30-36.
[19] POWERS T C. Structure and physical properties of hardened portland cement paste[J]. Journal of the American Ceramic Society, 1958, 41(1): 1-6.
[20] LI Q, GENG H, HUANG Y, et al. Chloride resistance of concrete with metakaolin addition and seawater mixing: A comparative study[J]. Construction and Building Materials, 2015, 101: 184-192.
[21] SIKORA P, CENDROWSKI K, ABD ELRAHMAN M, et al. The effects of seawater on the hydration, microstructure and strength development of Portland cement pastes incorporating colloidal silica[J]. Applied Nanoscience, 2019, 10(8): 2627-2638.
[22] WANG J, LIU E, LI L. Multiscale investigations on hydration mechanisms in seawater OPC paste[J]. Construction and Building Materials, 2018, 191: 891-903.
[23] GUO M, HU B, XING F, et al. Characterization of the mechanical properties of eco-friendly concrete made with untreated sea sand and seawater based on statistical analysis[J]. Construction and Building Materials, 2020, 234: 1-12.
[24] LIU J, FAN X, LIU J, et al. Investigation on mechanical and micro properties of concrete incorporating seawater and sea sand in carbonized environment[J]. Construction and Building Materials, 2021, 307: 1-17.
[25] 姬永生, 董亚男, 袁迎曙, 等. 混凝土孔隙水饱和度的机理分析[J]. 四川建筑科学研究, 2010, 36(2): 215-218.
[25] JI Yongsheng, DONG Yanan, YUAN Yingshu, et al. Mechanism analysis of pore water saturation of concrete[J]. Sichuan Building Science Research, 2010, 36(2): 215-218.
[26] 葛勇, 常传利, 杨文萃, 等. 常用无机盐对溶液表面张力及混凝土性能的影响[J]. 混凝土, 2007(6): 7-9.
[26] GE Yong, CHANG Chuanli, YANG Wencui, et al. Effect of inorganic salts on surface tension of solution and properties of concrete[J]. Concrete, 2007(6): 7-9.
[27] ADAMSON A W. Physical chemistry of surfaces[M]. 3rd ed. New York: Wiley-Interscience, 1976.
[28] PITZER K S. Activity coefficients in electrolyte solutions[M]. 2nd ed. Boca Raton, FL, USA: CRC Press, 1991.
[29] 钱如胜. 现代混凝土孔溶液离子演变规律及数值模拟[D]. 南京: 东南大学, 2018.
[29] QIAN Rusheng. Ionic evolution law and numerical simulation of pore solution in concrete[D]. Nanjing: Southeast University, 2018.
[30] HOLT E, LEIVO M. Cracking risks associated with early age shrinkage[J]. Cement and Concrete Composites, 2004, 26(5): 521-530.
[31] CLAISSE P A. Civil engineering materials[M]. Boston, USA: Butterworth-Heinemann, 2016.
[32] 贾道光. 湿度环境对混凝土中GFRP筋耐久性能影响研究[D]. 哈尔滨: 哈尔滨工程大学, 2015.
[32] JIA Daoguang. Effect of humidity on durability of GFRP bars in concrete[D]. Harbin: Harbin Engineering University, 2015.
[33] 中华人民共和国住房和城乡建设部. 土木工程用玻璃纤维增强筋: JG/T 406—2013[S]. 北京: 中国计划出版社, 2013.
[33] Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Glass fiber reinforcement for civil engineering: JG/T 406—2013[S]. Beijing: China Planning Press, 2013.
[34] ALI A H, MOHAMED H M, BENMOKRANE B. Bar size effect on long-term durability of sand-coated basalt-FRP composite bars[J]. Composites Part B: Engineering, 2020, 195: 1-13.
[35] ACI. Guide for the design and construction of structural concrete reinforced with FRP bars: ACI 440.1 R-15[S]. Indianapolis, USA: American Concrete Institute, 2015.
Options
Outlines

/

〈 〉