Abstract
In the present study, the effect of harsh conditions on the tensile behavior of lap-spliced carbon fiber textile-reinforced mortar (TRM) with different surface treatment methods was investigated through the direct tensile test. The TRM coupons were exposed to three different harsh conditions: a chloride environment of 3.5 wt.% sodium chloride, a high temperature and humidity environment (50 °C and 95% relative humidity), and sustained load of 30% of the tensile strength during 60 days. In addition, two different surface treatment methods of the lap-spliced region of TRM coupons were used: carbon fiber textile impregnated by epoxy resin, and carbon fiber textile covered with aluminum oxide (Al2O3) powder after epoxy resin impregnation. The tensile characteristics of TRM coupons were investigated in terms of the cracking strength, ultimate strength, initial stiffness, and ultimate strain, to evaluate the influence of different surface treatment methods on the tensile behaviors of TRM coupons after exposure to various types of harsh conditions. Additionally, the test results were compared to the previous test results of TRM coupons that were not subjected to harsh conditions.
Highlights
Fiber-reinforced polymer (FRP) methods have been widely applied in civil engineering due to their various advantages: no difficulty in the application with various shapes, high speed in the installation, high capacity of corrosion resistance, lightweight, and good mechanical properties [1,2,3,4,5].the disadvantages of FRP methods could include their low capacity of fire resistance, poor behavior at high temperatures, low capacity of vapor permeation, low compatibility between resins and the structural surface, and irreversibility of the application [6,7,8,9]
The test results were compared to the previous test results of textile-reinforced mortar (TRM) coupons that were not subjected to harsh conditions
The direct tensile test results of TRM coupons were investigated in terms of cracking strength, ultimate strength, initial stiffness, and ultimate strain, to evaluate the effect of different surface treatment methods on the tensile behaviors of TRM coupons subjected to harsh conditions
Summary
Fiber-reinforced polymer (FRP) methods have been widely applied in civil engineering due to their various advantages: no difficulty in the application with various shapes, high speed in the installation, high capacity of corrosion resistance, lightweight, and good mechanical properties [1,2,3,4,5]. Various surface treatment methods were applied on the surface of TRM coupons using epoxy impregnation [24,25,26,27] or sand coating after epoxy impregnation [27,28,29] of the textile or polymer coating of single filament jute fibers and yarns [30], which could significantly enhance the mechanical characteristics of the TRM coupons (e.g., bond strength and stiffness). These techniques might result in an improvement of the mechanical properties of the TRM composite. The direct tensile test results of TRM coupons were investigated in terms of cracking strength, ultimate strength, initial stiffness, and ultimate strain, to evaluate the effect of different surface treatment methods on the tensile behaviors of TRM coupons subjected to harsh conditions
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