in situ measurement of concrete creep and shrinkage in ambient subarctic weather

This study evaluated the performance of corroded reinforced concrete (rc) beams strengthened with high-performance steel fiber mortar and normal reinforcements. for that, six rc beams were corrosively imposed in 1 month, 2 months, and 3 months with a 3% nacl solution and the direct current power type of 900 μa/cm2. as a result, the weight reduction of reinforcements of the beams due to three corrosion levels was 11.3%, 14.3%, and 24.8%, respectively. those corroded beams were thereafter strengthened using the high-performance steel fiber mortar and normal reinforcements. a series of flexural tests were conducted to quantify the structural capacity improvement of strengthened rc beams. the experimental results showed that the stiffness, strength, and ductility of the strengthened beams were significantly higher than those of the corroded and non-corroded rc beams. additionally, the strengths of the retrofitted beams were almost similar, and it was approximately 2.35 times and 2.52 times larger than that of the non-corroded and corroded rc beams, respectively. the high-performance steel fiber mortar can be a feasible solution for the strengthening of corroded or degraded rc structures. moreover, the damage indicators of the tested beams, which are crack patterns, crack width evolution, and strain distribution of reinforcing bars, were further analyzed in this study.