Durability Test and Mechanical Properties of CFRP Bolt under Accelerated Corrosion Conditions

Abstract

In order to study the influence of acid corrosion on the quality, elastic modulus, tensile strength, elongation, and other properties of epoxy mortar test block and CFRP bolt, the durability test and mechanical properties test of CFRP bolt under accelerated corrosion conditions were proposed. An epoxy mortar test block was soaked in acidic solution for 90 d, and the quality, elastic modulus, tensile strength, elongation, and other properties of CFRP bolt were analyzed. Through the analysis of test data, the load-slip relationship curve of bolt was obtained and the Arrhenius equation was used. The relationship curve between tensile strength retention and logarithm of time in test environment was obtained, and the concept of conversion factor TSF was introduced to predict the strength retention of anchor corroded by acid rain for 20 years in service. The experimental results show that the maximum loss rates of mass, elastic modulus, and compressive strength of epoxy mortar test block are 1.98%, 2.81%, and 11.25%, respectively, during 90 d immersion in acidic solution. The maximum loss rates of mass, elastic modulus, tensile strength, and elongation of CFRP bolt are 0.65%, 3.29%, 6.51%, and 5.06%, respectively. Based on the analysis of the test data, the load-slip curve of the bolt is obtained, which indicates that acid corrosion reduces the bond performance of CFRP bolt. The bond-slip curve of bolt after 90 d acid corrosion was obtained by further analysis of experimental data. Conclusion. The experiment has certain engineering application values.