## 1 Introduction
Building materials research has investigated the possible application of electrically heated carbon reinforcement through comprehensive studies, innovative concepts and practical implementation in construction projects. Its main application involves integration into building components. For instance, CTR can serve as an electrical resistance heating element, providing capabilities such as radiant heating or heat storage in concrete elements, thereby acting as protection against condensation [11; 12]. This was implemented using electrically heated CTRC as a method of radiant heating in wall components [13; 14]. In these studies, a hybrid textile reinforcement composed of carbon fibers in the wrap direction and alkali-resistant glass fibers in the weft direction was used [13]. Moreover, the heat generated by the electrically heated CTR had a positive influence on the hydration behavior of the concrete and could be utilized for the de-icing of outdoor facilities, such as car parking spaces or infrastructure [15; 16]. [PERSON] et al. conducted numerical and experimental investigations of  
Figure 1: Exemplarily heated CTR: (**a**) connected epoxy resin-impregnated CTR—test setup; (**b**) epoxy resin-impregnated CTR—one fiber strand connected; (**c**) epoxy resin-impregnated CTR—weft fiber strand connected; (**d**) polystyrene-impregnated CTR—weft fiber strand connected. the electrothermal properties. In their research, the potential for de-icing through the heat generated in the composite material of carbon/glass fiber hybrid textile-reinforced concrete was validated, as evidenced by both numerical simulations and experimental studies [17]. To implement the proposed application of electrically heated CTRC, investigating the material's behavior under temperature loading is essential. To contextualize the material behavior of electrically heated CTRC and the test results of this study, findings on the components (mortar, carbon fiber and impregnation) as well as the composite are summarized within the investigated temperature range of up to 80 \({}^{\circ}\)C [18]. It is noteworthy that these results were obtained through ambient-temperature heating. [PERSON] et al. [19] conducted experimental tests to assess the impact of tempering on tensile strength of CTRC. The testing temperatures ranged from 20 to 120 \({}^{\circ}\)C, and unimpregnated CTR as well as epoxy resin-impregnated CTR with additional sanding were used. The unimpregnated material showed no strength loss due to temperature exposure, whereas the epoxy resin-impregnated material exhibited a reduction of up to 70% when tested at 80 \({}^{\circ}\)C. These results, as shown in Figure 2, led to more pronounced reduction compared to other findings. Consequently, reductions of this magnitude are not expected for CTRC. Furthermore, the structural functionality of the epoxy resin-impregnated material was preserved after exposure to high temperatures and subsequent cooling [19]. Additional expansion tests up to 80 \({}^{\circ}\)C with epoxy resin-impregnated CTR with additional sanding were conducted by [PERSON] [1]. A reduction in tensile strength of up to 4.4% at 80 \({}^{\circ}\)C in comparison to 23 \({}^{\circ}\)C was highlighted. An increase in testing temperature corresponded to a lower number of cracks alongside an increase in the average crack width [1]. In comparison, [PERSON] et al. conducted tensile tests on CTRC, specifically basalt fibers impregnated with styrol-acrylate in conjunction with refractory concrete [20; 21]. These tests were conducted at elevated temperatures ranging from 75 to 1000 \({}^{\circ}\)C, as well as after preheating and testing at room temperature. The results demonstrated an increase in tensile strength of 43% for specimens heated up to 150 \({}^{\circ}\)C. In addition, a finer crack pattern with increasing test temperature was observed with digital image correlation (DIC) [20].