The material behavior of carbon-reinforced concrete has been investigated for almost three decades. During this time various projects with textile reinforcements have been realized [1; 2; 3; 4]. Meanwhile, material parameters for design have been investigated [5; 6; 7; 8], and standardized testing methods have been derived [9; 10]. For the realization of buildings and elements made of CRC, potential users in Germany are dependent on an approval in individual cases or a general building approval. To date, there are no accepted standards, data sheets and guidelines available that make these approvals for dimensioning redundant. Therefore, the research program C3--Carbon Concrete Composites--was initiated, which focuses on the economical and marketable application of carbon-reinforced concrete. In individual subprojects of this research program, various aspects for the design and application of carbon-reinforced concrete are investigated [11]. For example, a carbon concrete guideline is drafted within the framework of project C3-V1.2, while in the project C3-V2.1, the long-term durability behavior of carbon reinforcement in composite is investigated for both durability and fatigue. For approvals and eventually design concepts, the question of strength losses due to long-term loading and environmental exposure must be addressed. So far, long-term losses have been considered using conservative reduction and partial safety factors which, however, do not allow for an economical design. For this reason, the Institute of Structural Concrete of RWTH Aachen University is investigating the long-term durability of an epoxy resin impregnated carbon reinforcement combined with a high-strength concrete. The study is part of the collaborative subproject C3-V2.1. This paper presents the results of current small-scale experiments to determine and evaluate the long-term durability of this material combination and sets the current results in the context of reduction factors from the literature. To develop a testing concept for investigating the long-term durability of carbon-reinforced concrete, this property must be defined first. According to CSA S807-10 [12] (p. 3), durability is defined as 'the capability of a component, product, or structure to maintain its function for at least a specified period of time without appropriate maintenance'. The properties of fiber-reinforced polymers include alkaline and creep resistance and can both be determined according to CSA S806-12 [13], ACI 440.3R-12 [14] or ISO 10406-1 [15]. The testing methods for alkaline resistance of FRP bars (CSA S806-12 Annex M [13]; ACI 440.3R-12 B.6 [14]; ISO 10406-1 section 11 [15]) are used to investigate the tensile capacity and the weight of an FRP rod before and after immersion in an alkaline solution. These testing methods differentiate between tests with and without loading, as well as immersion in an alkaline solution or exposure in concrete. The test method for creep rupture of FRP bars (ACI 440.3R-12 [14]) refers to the ASTM D7337/D7337-M [16] 'Standard Test Method for Tensile Creep Rupture of Fiber Reinforced Polymer Matrix Composite Bars', where the creep rupture capacity is defined as 'the force at which failure occurs after a specified period of time from initiation of a sustained force' (p. 1). The testing concepts for the investigation of the creep behavior of the FRP bars are based on the determination of the time to failure due to a constant stress. A semi-logarithmic relationship between time and constant stress is derived [13; 15; 16]. A testing concept which considers the combined testing of the creep behavior and alkaline resistance was developed by [PERSON] and [PERSON] [17]. The concept was developed for the approval procedure of the GFRP Schock ComBar(r) in Germany. Long-term durability tests at temperature levels of 23, 40 and 60 \({}^{\circ}\)C in high-alkaline water-saturated concrete were performed to prove the Arrhenius equation.