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结构混凝土中的钢筋腐蚀主要是由于其中存在氯离子的缘故。当混凝土中氯离子的浓度达到0.5～1kg/m~3时,氯离子将溶解掉保护性氧化膜,这样就会导致里面的钢筋受到腐蚀。钢筋受到腐蚀后,混凝土结构的质量就会受到影响。因此,早期的钢筋腐蚀检测对于基础设施的长期有效管理至关重要。在整个过程中,由于声波发射技术能够检测到微弱的应力波,因此该技术成为检测的首选技术。当正在腐蚀的钢筋上产生腐蚀生成物时,这些腐蚀生成物对周围的混凝土产生应力,此时将产生微小裂纹并且形成应力波。微小裂纹的发育程度与所产生的腐蚀生成物数量成正比。这样,通过检测声波发射事件的频率和其振幅,就可以了解混凝土中钢筋的
Rebar corrosion in structural concrete is mainly due to the presence of chloride ions. When the concentration of chloride ions in the concrete reaches 0.5 to 1 kg/m 3 , chloride ions will dissolve the protective oxide film, which will cause corrosion of the steel bars inside. After the rebar is corroded, the quality of the concrete structure is affected. Therefore, the early detection of rebar corrosion is crucial for the long-term effective management of infrastructure. Throughout the process, this technology has become the technology of choice for detection because acoustic wave emission technology can detect weak stress waves. When corrosion products are generated on the corrosion-reinforcing steel bars, these corrosion products generate stress on the surrounding concrete, which will generate minute cracks and form stress waves. The degree of development of micro cracks is proportional to the number of corrosion products produced. In this way, by detecting the frequency and amplitude of acoustic emission events, one can understand the