Test Research on Bonding Strength between GFRP Anchor Bolt and Concrete under Corrosive Conditions

Abstract:

In practical projects, GFRP anchor bolts are in complex geological conditions with corrosive factors such as acid, alkalis, salt and freeze-thaw circle. In corrosive conditions, the bonding strength of GFRP anchor bolts are in direct relation to safety of anchoring works. Based on comparative tests on bonding strength between GFRP anchor bolt and concrete, failure modes in pull-out tests of GFRP anchor bolt and concrete are mainly pull-out failure and splitting failure. Pull-out failure is a chemical and mechanical interlocking failure between GFRP anchor bolts and concrete cubes, which can actually reflect the bonding status of bolts and concrete cubes. Splitting failure is a failure that the radial expansion force caused when the GFRP anchor bolt are bearing forces damages the concrete if it is of low strength or insufficient in thickness of protection layer and thus leads to boding failure. From the analysis on test results of bond-slip performance, the bonding strength decline the most in alkalis conditions: the bonding strength decreases by 23% after 1500 hours of corrosion and the slip displacement increases by 2.4mm; in acid and salt conditions, after 1500 hours of corrosion the bonding strength decreases by 19% and 17% and slip displacement increase by 1.6mm and 1.8mm, respectively. Based on analysis of nonlinear curve fitting on test data of bonding strength in three corrosive conditions, three empirical equations of degradation of bonding strength are fitted for GFRP anchor bolts in three corrosive conditions. Compared with data from reference [13], the bonding strength of GFRP anchor bolts working in acid, alkalis and salt geological conditions for 50 years decrease by 19.5%, 25% and 19.2%, respectively. These research results supply a test basis for GFRP anchor bolts used in complex geological conditions.

• Periodical: Applied Mechanics and Materials (Volumes 212-213)
• Pages: 904-911
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.212-213.904
• Online since: October 2012
• Authors: Xie Xing Tang, Xiao Yong Luo, Kai Lei Li, Ya Chuan Kuang
• Keywords: Bonding Strength, Corrosion Resistance, Glass Fiber Reinforced Polymer (GFRP), Slip

References

[1] Liangkui Cheng, Xiangfan Li: Geotechnical Anchoring, Soil Nail, Shotcreting-Principles, Design and Application, China Architecture and Building Press, (2010) In Chinese.

[2] Dejke V, Teppers R, Durability and Service Life Time Prediction of GFRP for Concrete Reinforcement, FRPRCS-5: Durability of Fibre Reinforced Plastics, ed, Thomas Telford, 2001, p.505—513.

[3] Yingzi Zhang, Yingfang Fan, Yinghua Zhao: Tests and Researches on Bonding strength of New GFRP Grouting Bolt [J], Chinese Journal of Rock Mechanics and Engineering, 2006, 10: 17-21. In Chinese.

[4] Xianquan Shi, Zhiqiang Zhang, Zhiye Li: Research on Pull-Out Test Of Bonding strength Of GFRP Bolt And Concrete[J], Railway Engineering, 2010, 10: 133-136. In Chinese.

[5] Jian Chen: Bond-Slip Test of GFRP Bolt and Fiber Reinforced Concrete [Master Dissertation], Dalian, Dalian University of Technology, 2007. In Chinese.

[6] Qingduo Hao, Yanlei Wang, Jinping Ou: Bonding Strength Test on GFRP Bolt and Concrete Under Pull-Out Conditions [J], Journal of Building Structures, 2008, 29: 103-107. In Chinese.

[7] Hengning Guo: Studies on Bond Slippage Relation and Anchorage Properties of FRP Tendons Concrete, Hi-tech Fiber & Application, 2006, 5: 67-74.

[8] American Concrete Institute. Guide for the Design and Construction of Concrete Reinforced with FRP Bars[S]. ACI Report 440. IR-O103, Farmington Hills, (2004).

[9] Canadian Standards Association, CAN／CSA—S806—02. Design and Construction of Building Components with Fibre Reinforced PolymersIs]. Canadian Stand—ards Association, Rexdale, Ontario, (2002).

[10] Brahim Tighiouart, Brahim Benmokrane, Phalguni Mukhopadhyaya. Bond Strength Of Glass FRP Rebar Splices in Beams under Static Loading[J]. Construction and Building Materials 1999(13): 383～392.

DOI: 10.1016/s0950-0618(99)00037-9

[11] Yinghao Liu, Yong Yuan: Experimental Research on Anchorage Performance of Full-Thread GFRP Bonding Anchor Bolts [J], Chinese Journal of Rock Mechanics and Engineering, 2010, 26(13): 26-34. In Chinese.

[12] Changliang Lu, Tingwang Liu: Test And Research on Corrosion Resistance of GFRP Anchor Bolt [J], Journal of China and Foreign Highway, 2009, 10: 5-6. In Chinese.

[13] Xueshi Chen, Short-Term Study on Bonding strength and Durability of Glass Fiber Bar and Concrete [Master Dissertation], Jiangsu: Hohai University, 2007. In Chinese.