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A platform for research: civil engineering, architecture and urbanism
Test Research on Bonding Strength between GFRP Anchor Bolt and Concrete under Corrosive Conditions
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 2.4 mm; in acid and salt conditions, after 1500 hours of corrosion the bonding strength decreases by 19% and 17% and slip displacement increase by 1.6 mm and 1.8 mm, 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.
Test Research on Bonding Strength between GFRP Anchor Bolt and Concrete under Corrosive Conditions
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 2.4 mm; in acid and salt conditions, after 1500 hours of corrosion the bonding strength decreases by 19% and 17% and slip displacement increase by 1.6 mm and 1.8 mm, 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.
Test Research on Bonding Strength between GFRP Anchor Bolt and Concrete under Corrosive Conditions
Tang, Xie-Xing (author) / Luo, Xiao-Yong (author) / Li, Kai-Lei (author) / Kuang, Ya Chuan (author)
2012
8 Seiten
Conference paper
English
Test Research on Bonding Strength between GFRP Anchor Bolt and Concrete under Corrosive Conditions
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