The aim of this study is to repair or strengthen elevated temperature damaged concrete. For this purpose, in concretes prepared with water to binder ratio (0.30) and normal aggregate replaced by lightweight aggregates with size fraction of 0-2 mm at three different volume fractions such as 35%, 70% and 100% of fine aggregate volume (0-2mm) of concrete were exposed to 300, 500 and 700 0C for three hours. In addition, three group of air entrained agent (AEA), polypropylene fiber (PPF) (6mm, 20mm and 35mm) and expanded perlite aggregate (EPA) containing concretes were also exposed to the elevated temperature. Before and after elevated temperature exposure, and after repair and strengthening of samples with glass fiber reinforced polymer (GFRP) were tested. As a result, water absorption ratio increased and compressive strength decreased with quantity augmentation of PPF, EPA and AEA, for all of 0.30 w/b ratio before and after elevated temperature exposure. After repairing of elevated temperature damaged concrete specimens, improvement of compressive strength were observed. After repair with GFRP, compressive strength increment ratio was by 233% when compared to those of samples before and after exposed to the elevated temperature.