Abstract
The tensile behaviors of textile-reinforced mortar (TRM) composites made with carbon fiber textile and alumina cement-based mortar were investigated through direct tensile tests. Three different surface treatment details in the lap splice area were used to improve the tensile behaviors of the TRM composites: carbon fiber textile impregnated by epoxy, carbon fiber textile coated with aluminum oxide powder following epoxy impregnation, and carbon fiber textile coated with aluminum oxide powder following both carbon fiber fabric attachment and epoxy impregnation. Three different lap splice lengths were used 180, 200, and 220 mm. In addition, the tensile properties of TRM composites following exposure to high temperature were investigated as well. In this test, TRM test specimens were exposed to two different temperature histories with maximum values of 250 and 350 °C. The results of the test specimens according to the test parameters were analyzed in terms of initial stiffness, cracking strength, corresponding strain at cracking, modulus of elasticity in the cracked stage, peak strength, and ultimate strain. The influence of lap splice length on the tensile behaviors of the TRM composites was analyzed and discussed. The surface treatment in the overlapping region showed ductile behavior and resulted in a significant improvement of the peak strength and ultimate strain over the untreated lap splice textile. Following exposure to high temperature, the TRM composites showed a reduction of tensile responses compared to those cured at room temperature. In addition, a prediction model developed in the previous study was used to predict the tensile behaviors of the lap-spliced carbon fiber-textile reinforced mortar composites exposed to high temperature, and the prediction by the model showed a good agreement with the experimental results.
Highlights
Various retrofitting techniques, such as steel plates, fiber sheets or plates, and composite materials including fiber-reinforced polymer (FRP), have been developed for application into strengthening and repairing existing concrete structures showing strength shortages, which are mainly due to deterioration caused by time and increasing applied loads [1,2,3,4]
This study experimentally investigated the characteristics of textile-reinforced mortar (TRM) composite specimens through direct tensile testing
In the case of the specimen named L200ES-RT (Figure 3e), the carbon fiber filaments of textile example, as presented in Table 1, specimen L200ES-250 indicates that the TRM test specimen has a reinforcement mesh in the overlapping region were first impregnated with epoxy resin with a weight lap splice length of 200 mm, the lap splice joint was impregnated with epoxy resin and coated with of approximately 60 g, the carbon textile was coated with aluminum oxide (Al2 O3 ) powder having aluminum oxide powder, and the TRM specimen was exposed to high temperature with a a diameter of 250 μm [33,34] using a spraying gun at high speed
Summary
Various retrofitting techniques, such as steel plates, fiber sheets or plates, and composite materials including fiber-reinforced polymer (FRP), have been developed for application into strengthening and repairing existing concrete structures showing strength shortages, which are mainly due to deterioration caused by time and increasing applied loads [1,2,3,4]. Among these retrofit materials, fiber-reinforced polymer composites have been widely employed due to their ease of installation in various shapes, lightweight nature, high corrosion resistance capacity, and high tensile strength and stiffness [5,6]. An analytical model was used to predict the mechanical properties of the lap-spliced carbon fiber-textile reinforced mortar composites exposed to high temperature
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