1.1 本试验方法包括估算现场和实验室混凝土中未涂层钢筋的电腐蚀电位，以确定钢筋的腐蚀活性。 1.2 此测试方法受电路限制。建筑物内部和沙漠环境中的混凝土表面失去了足够的水分，因此混凝土电阻率变得很高，可能需要本试验方法未涵盖的特殊试验技术（见 5.1.4.1 ). 涂有密封剂或经密封剂处理的混凝土表面可能无法提供可接受的电路。电路的基本配置如所示 图1 . 图1 参比电极电路 1.3 以国际单位表示的数值视为标准值。SI单位后括号中给出的值仅供参考，不视为标准值。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 该试验方法适用于在役评估和研发工作。 4.2 本试验方法适用于构件，无论其尺寸或钢筋上混凝土保护层的深度如何。超过75 mm（3 in.）的混凝土保护层可能导致相邻钢筋腐蚀电位的平均值，从而导致失去辨别相对腐蚀活性变化的能力。 4.3 本试验方法不适用于环氧涂层钢筋的钢筋混凝土结构。 4.4 本试验方法不适用于防水膜位于钢筋笼和混凝土表面之间的钢筋混凝土结构，因为它们可以防止导电并导致读数错误。 4.5 该试验方法可在混凝土凝固后的混凝土构件寿命期间的任何时候使用，但通常最适用于评估怀疑易受腐蚀的成熟钢筋混凝土。 4.6 使用本试验方法获得的结果不应被视为估算钢材或钢筋混凝土构件结构性能的方法。 4.7 温度和湿度会影响潜在读数。这对于同一测试位置的定期测试尤为重要。温度升高导致离子迁移率增加，进而影响参比电极的电位。如果在22范围内进行测量，则可以忽略温度影响。 2. 摄氏度±5.5 °C（72 华氏度±10 °F）。否则，必须考虑测量的温度依赖性。 4.8 潜在测量值应由在混凝土材料和腐蚀测试领域有经验的工程师或技术专家进行解释。除了腐蚀电位测量外，通常还需要使用其他补充数据，如氯化物含量、碳化深度、分层调查、腐蚀速率和环境暴露条件，以得出关于埋置钢腐蚀活性及其对结构使用寿命可能影响的结论。

1.1 This test method covers the estimation of the electrical corrosion potential of uncoated reinforcing steel in field and laboratory concrete, for the purpose of determining the corrosion activity of the reinforcing steel. 1.2 This test method is limited by electrical circuitry. Concrete surface in building interiors and desert environments lose sufficient moisture so that the concrete resistivity becomes so high that special testing techniques not covered in this test method may be required (see 5.1.4.1 ). Concrete surfaces that are coated or treated with sealers may not provide an acceptable electrical circuit. The basic configuration of the electrical circuit is shown in Fig. 1 . FIG. 1 Reference Electrode Circuitry 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 This test method is suitable for in-service evaluation and for use in research and development work. 4.2 This test method is applicable to members regardless of their size or the depth of concrete cover over the reinforcing steel. Concrete cover in excess of 75 mm (3 in.) can result in an averaging of adjacent reinforcement corrosion potentials that can result in a loss of the ability to discriminate variation in relative corrosion activity. 4.3 This test method is not applicable to reinforced concrete structures with epoxy-coated reinforcement. 4.4 This test method is not applicable to reinforced concrete structures in which waterproofing membranes are located between the reinforcement cage and the concrete surface as they can prevent the conduction of electricity and result in erroneous readings. 4.5 This test method may be used at any time during the life of a concrete member after the concrete has set, although it is generally most useful for evaluating mature reinforced concrete that is suspected to be susceptible to corrosion. 4.6 The results obtained by the use of this test method shall not be considered as a means for estimating the structural properties of the steel or of the reinforced concrete member. 4.7 Temperature and humidity can impact potential readings. This is particularly important for periodic testing of the same test location. An increase in the temperature leads to increasing ionic mobility, which in turn affects the reference electrode’s potential. The temperature influence can be neglected if the measurements are taken within the range of 22.2 °C ± 5.5 °C (72 °F ± 10 °F). Otherwise, the temperature-dependency of the measurements must be taken into account. 4.8 The potential measurements should be interpreted by engineers or technical specialists experienced in the fields of concrete materials and corrosion testing. It is often necessary to use other complementary data such as chloride contents, depth of carbonation, delamination survey, rate of corrosion, and environmental exposure conditions, in addition to corrosion potential measurements, to formulate conclusions concerning corrosion activity of embedded steel and its probable effect on the service life of a structure.