Given the substantial size of the buildings under scrutiny, it is preferable to employ techniques that enable comprehensive assessment of extensive areas. Active thermography is a rapid and non-contact method for analyzing large structures, which makes it valuable for field study. In this study, the active thermography with microwave excitation technique for quality assessment of CFRP concrete reinforcement was employed. Active thermography utilizes an external energy source to create a temperature contrast in the specimen [16]. Numerous global research institutions investigate thermal imaging techniques for the investigation of large-scale objects, such as complex structures made of concrete. Passive thermography utilizes ambient solar radiation instead of an external heat source. This approach entails extended periods of monitoring and is influenced by daily changes and meteorological factors [16; 17]. A variety of active thermography approaches employ halogen lamps, laser, flash lights, infrared radiators, and hot air as heat sources [18; 19; 20; 21; 22; 23; 24]. In this case, the outcomes are no longer contingent on the external condition; the primary concern is the extended duration required for heating because of the size of the structure. It is crucial to recall that conduction is the process by which heat is transferred from a heated surface to the inside of an object. These stimulation methods are highly specialized, resulting in longer examination durations. Vibrothermography [25; 26; 27] employs mechanical energy and dissipation mechanisms to identify flaws. The acoustic wave stimulation propagates through the tested structure and attenuates in areas of damage and defects. While acoustic approaches have proven to be effective, they need direct physical contact between the exciter and the test object, which can pose challenges in some circumstances. These methods are most effective for identifying significant defects such as fractures. The utilization of microwave irradiation is proposed as the method of choice for heating in this study. Studies in the literature have utilized microwave heating to expedite the process of concrete curing, disinfect cement, and facilitate the drilling or melting of concrete [28; 29; 30; 31; 32; 33; 34; 35; 36; 37]. Microwaves have the potential to provide the necessary energy for infrared thermography, as indicated by several studies [38; 39; 40; 41; 42; 43]. The primary advantage of microwave heating lies in its volumetric nature. This approach is efficient as it rapidly heats up a precise volume of the specimen at a given moment. This feature of microwave heating is advantageous when we compare it with other previously mentioned techniques (passive thermography, conventional optical heating sources, or vibrothermography) because it effectively reduces the time required to achieve temperature differences that can be measured by the camera. This benefit is particularly significant when analyzing large-scale structures. An additional advantageous aspect of this approach is its non-invasive characteristic, which is particularly valuable in situations when direct entry to the object under investigation is not possible and assessment from a distance is required. In the microwave infrared thermography (MIRT) method, the heating ratio of this alternative energy source is influenced by both thermal and electrical properties, specifically the dielectric constant [38; 45]. In the case of conductive materials such as CFRP, microwave heating is limited by a shallower depth of penetration. Following the application of heat, a thermovision camera is utilized to visually assess the specimen. Delamination and adhesive loss can result in uneven heating of the sample, which is visible in the registered temperature distribution [20; 46; 47; 48; 49; 50]. In this article, the findings of our research on the study of concrete samples reinforced with a carbon composite material are presented. The experiments involved submitting the material to microwave irradiation at a constant power level.