Abstract
To study the self-repair performance of smart concrete beams strengthened by shape memory alloys (SMA) wires, the experiment used 4/6/8 mm diameter steel bars (RC), SMA memory sticks (SMA-m), and SMA super elastic rods (SMA-s) as the main bars. Ni-Ti SMA wires were used to reinforce concrete beams of different main reinforcement types, and 9 SMA smart concrete beams were made for comparative experiments. The self-repair performance of SMA smart concrete beams was analyzed, the recovery rate of each concrete beam was compared, and the reinforcement was found. The test beam exhibited best performance after recovery. The results show that different types of main reinforcement have a greater impact on the recovery performance of concrete beams. The reinforcement of SMA wire has a certain effect on the concrete beams, but very high reinforcement will reduce the recovery rate. Among them, Ni-Ti monoliths with a main reinforcement of φ6 are embedded. The recovery ability to the memory alloy rod, namely SMA-m6, is the best.
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