Electrical resistivity is widely used to monitor the durability of concrete structures. However, the results obtained can be misinterpreted due to the effect of several parameters on the test. Therefore, the effect of six parameters on the electrical resistivity was investigated in this article. The studied parameters were (1) the thickness of the concrete cover; (2) the contact with the concrete mold; (3) the concrete aging; (4) the chloride presence; (5) the type of cure and exposure; and (6) the position of the equipment regarding the reinforcement direction. Tests were performed on aged non-reinforced concrete specimens (5 years old) and freshly casted specimens. The results showed that variation in the thickness of the reinforcement covers from 1.5 to 3.0 cm affects the electrical resistivity measurements, independently of the w/c ratio. The contact of the concreting mold with the specimen did not influence the values of electrical resistivity, independently of the w/c ratio. The effect of the chlorides incorporated into the mass of the concrete during casting is not significant on the electrical resistivity at 28 days. The electrical resistivity was 13.2% higher in specimens cured in a moist chamber, compared to curing in an uncontrolled external environment. The electrical resistivity was no longer influenced by the steel at a minimum parallel distance of 8.0 cm. Measurements performed perpendicular to the bar were not affected. These results are very important for a better interpretation of the results of this technique.

中文翻译：

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混凝土电阻率试验中不同参数的分析

电阻率被广泛用于监测混凝土结构的耐久性。然而，由于几个参数对测试的影响，获得的结果可能会被误解。因此，本文研究了六个参数对电阻率的影响。研究的参数是（1）混凝土保护层的厚度；(2)与混凝土模具的接触；(3)混凝土老化；(4)氯化物的存在；(5) 治疗和暴露的类型；(6) 设备在加固方向上的位置。对老化的非钢筋混凝土试样（5 年）和新浇筑的试样进行了测试。结果表明，钢筋覆盖层厚度从 1.5 到 3.0 厘米的变化会影响电阻率测量，与水灰比无关。混凝土模具与试样的接触不影响电阻率值，与水灰比无关。在浇筑过程中掺入混凝土质量中的氯化物对 28 天时的电阻率的影响并不显着。与在不受控制的外部环境中固化相比，在潮湿室中固化的样品的电阻率高 13.2%。在 8.0 cm 的最小平行距离处，电阻率不再受钢的影响。垂直于杆进行的测量不受影响。这些结果对于更好地解释该技术的结果非常重要。在浇筑过程中掺入混凝土质量中的氯化物对 28 天时的电阻率的影响并不显着。与在不受控制的外部环境中固化相比，在潮湿室中固化的样品的电阻率高 13.2%。在 8.0 cm 的最小平行距离处，电阻率不再受钢的影响。垂直于杆进行的测量不受影响。这些结果对于更好地解释该技术的结果非常重要。在浇筑过程中混入混凝土质量中的氯化物对 28 天时的电阻率的影响并不显着。与在不受控制的外部环境中固化相比，在潮湿室中固化的样品的电阻率高 13.2%。在 8.0 cm 的最小平行距离处，电阻率不再受钢的影响。垂直于杆进行的测量不受影响。这些结果对于更好地解释该技术的结果非常重要。在 8.0 cm 的最小平行距离处，电阻率不再受钢的影响。垂直于杆进行的测量不受影响。这些结果对于更好地解释该技术的结果非常重要。在 8.0 cm 的最小平行距离处，电阻率不再受钢的影响。垂直于杆进行的测量不受影响。这些结果对于更好地解释该技术的结果非常重要。