## 1 Introduction  
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]. However, 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 (e.g., concrete or masonry), and irreversibility of the application (that is, the capability of undoing the repair, without harming the original structure) [6; 7; 8; 9]. Nowadays, the use of composite materials, including textile-reinforced mortar (TRM), for the repair and strengthening of concrete and masonry structures has become a common technique in the civil engineering community. TRM composites comprise a cement-based matrix reinforced with various types of fiber textile (e.g., carbon fiber textile, glass fiber textile). TRM composites have become an alternative solution to conventional techniques, such as steel plates, reinforced concrete (RC) overlay, post-tensioning, and even fiber-reinforced polymer systems. Therefore, TRM composites could be widely applied to strengthen, repair, and retrofit existing concrete and masonry structures [10; 11; 12; 13; 14; 15; 16]. To understand the mechanical characteristics of the TRM composite, many studies have been carried out on the bond properties of TRM used in concrete structures [17; 18; 19; 20; 21; 22; 23]. The fabric-mortar interface behavior is essential to the stress transfer between the fiber filaments within a yarn, and between the yarns and the mortar matrix. 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. In addition, the surface treatment could change the failure mode of the TRM composites from the slippage of carbon fiber mesh inside the mortar matrix to carbon fibers rupture [27]. A limited number of studies were performed to investigate the effect of harsh environments on the tensile behavior of TRM composites. One of the important aspects of TRM composites that requires a lot of attention is their ability to withstand harsh conditions, such as seawater, alkali and acid, hot-wet/dry environments, freeze and thaw cycles, etc. [PERSON] et al. [31] and [PERSON] et al. [32] showed that aggressive environments, especially seawater and alkaline environments, may reduce the tensile characteristics of carbon fiber-reinforced cementitious matrix composites. Therefore, more experimental studies are necessary to gain a better knowledge of the tensile behavior of TRM composites subjected to various types of harsh conditions. In this research, the effect of harsh conditions on the tensile behavior of TRM coupons was studied via direct tensile tests, in accordance with ACI 549.4R-13 [33]. The TRM coupons consisted of an aluminum cement-based mortar used as a binder, reinforced with a lap-spliced carbon fiber textile. The TRM coupons were subjected to three different harsh conditions: a chloride environment, a high temperature and humidity environment, and a sustained load. Moreover, the effect of two surface treatment methods at the lap-spliced region of the textile was investigated: epoxy impregnation, and aluminum oxide (Al\({}_{2}\)O\({}_{3}\)) powder coating after epoxy impregnation of carbon fiber textile.