Ultrasonic guided wave monitoring test for the corrosion status of steel bars
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摘要: 为了对钢筋锈蚀进行监测,基于压电超声导波法,采用埋置于混凝土内部贴附于钢筋两端的压电传感器,对电加速锈蚀的纯钢筋和混凝土中的钢筋以及未电加速方式锈蚀的混凝土中钢筋进行主动锈蚀监测。监测结果表明,在钢筋锈蚀过程中,其超声导波信号振幅变化可以明显监测到腐蚀的5个阶段,即钝化脱钝-起锈-脱黏-继续锈蚀-严重锈蚀;且导波信号振幅不随着锈蚀的加深而持续降低,而是具有一定的变化规律。使用超声导波监测包裹于混凝土中的钢筋锈蚀时,可以直接通过测定导波信号振幅不同阶段来区分钢筋所处的腐蚀阶段。该结论为工程实际监测提供了有力的数据支撑和支持。Abstract: In order to monitor the corrosion of steel bars, based on the piezoelectric ultrasonic guided wave method, active corrosion monitoring was carried out on single steel bars and steel bars in concrete that were electrically accelerated, as well as on steel bars in concrete that were not electrically accelerated, by embedding piezoelectric sensors attached to both ends of the steel bars inside the concrete. The monitoring results indicated that during the corrosion process of steel bars, the amplitude changes of ultrasonic guided wave signals can be significantly monitored in five stages of corrosion, namely passivation and depassivation, rust initiation, debonding, continued corrosion, and severe corrosion. The amplitude of the guided wave signal did not continuously decrease with the deepening of corrosion, but had a certain variation pattern. When using ultrasonic guided waves to monitor the corrosion of steel bars embedded in concrete, the corrosion stage of the steel bars can be directly distinguished by measuring the amplitude of the guided wave signal at different stages. This conclusion provided favorable data support and support for practical engineering monitoring.
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