Abstract
In steel-reinforced concrete (SRC) structures, it is difficult to separate or recycle steel and concrete using traditional demolition methods, which create a large amount of construction waste. A green and recyclable technology for demolishing SRC structures by induction heating (IH) is proposed in this study. The magnetic field calculation model of the rectangular coil used in IH demolition (IHD) is deduced and verified using COMSOL software. This calculation model can reduce the workload of magnetic field modelling and provide guidance for IHD scheme development. In addition, IH experiments are conducted on five section steels of different sizes. Furthermore, IHD experiments are performed on five SRC specimens that incorporated the five section steels. The temperature distribution and rise laws of the IHD are obtained. The feasibility of the IHD is verified. Under the IHD experimental conditions, the section steels and concrete are separated within approximately 15 min, and the critical expansion difference is approximately 1.85 mm. The applicability of the calculation model in the coil design and IH scheme is verified. The proposed IHD is expected to provide new ideas for reducing and recycling the amount of construction waste generated from the demolition of SRC structures.
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