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Evaluation of chloride contamination in concrete using electromagnetic non-destructive testing methods

机译：使用电磁无损检测方法评估混凝土中的氯离子污染

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We present the results of the sensitivity of some electromagnetic non-destructive testing (NDT) methods to chloride contamination. The NDT methods are resistivity, using a quadripole probe, capacitive technique, with few sets of electrodes, and radar technique, using different bistatic configurations. A laboratory study was carried out involving three different concretes with different water to cement ratios. The concretes were conditioned with different degrees of NaCl saturation by means of three solutions containing 0 g/L, 30 g/1 or 120 g/1. The solution was homogenized in the concrete by using a specific procedure. Results show that the EM techniques are very sensitive to the chloride content and saturation rate and, on a second level, to the porosity. Multi-linear regression processing was performed to estimate the level of sensitivity of the NDT measurements to the three indicators. Values of ten ND observables are presented and discussed. At last, the uncertainties of the regression models are studied on a real structure in a tidal zone.
机译：我们介绍了一些电磁无损检测（NDT）方法对氯化物污染的敏感性结果。 NDT方法是使用四极探针的电阻率，使用几套电极的电容技术和使用不同双基地配置的雷达技术。进行了一项实验室研究，涉及三种水灰比不同的混凝土。借助于包含0 g / L，30 g / 1或120 g / 1的三种溶液，以不同的NaCl饱和度处理混凝土。通过使用特定程序将溶液在混凝土中均质化。结果表明，EM技术对氯化物含量和饱和率非常敏感，并且在第二个方面对孔隙度非常敏感。进行了多线性回归处理，以估计NDT测量对这三个指标的敏感性水平。提出并讨论了十个ND观测值的值。最后，对潮汐带实际结构进行了回归模型的不确定性研究。

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