 The NSMR method for strengthening reinforced concrete beams was tested in this study. The method involves applying carbon fiber strips to the concrete reinforcement cover, and then bonding them with thixotropic epoxy resin. This process can take up to seven days at 23 degrees Celsius, but can be accelerated by heating the strips using a prototype heater. The study found that heating the strips significantly reduces the strengthening execution time from seven days to 1.5 hours. Additionally, the ratio of steel and composite reinforcements had no significant impact on the strengthening effectiveness. This article was authored by Dorida Michalowska-Mazyczuk and Barbara Gosksinska.