1.1 本试验方法包括在浸入模拟孔隙溶液饱和的水中后，测定模制试样或硬化混凝土芯部的体积电阻率或电导率，以快速指示其对液体和溶解侵蚀性离子渗透的阻力。 1.2 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。如果从另一标准获得的所需结果未在本标准使用的相同单位制中报告，则允许使用SI快速参考指南中的转换因子转换这些结果。 2. 1.3 本标准的文本引用了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应视为本标准的要求。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 ( 警告- 新鲜的水硬性胶结混合物具有腐蚀性，长时间接触可能会导致皮肤和组织化学烧伤。 ) 3. 有关具体警告声明，请参阅 8.1.2 . 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====== 5.1 混凝土的电阻率是在外加电场下离子运动的阻力。混凝土的电导率是衡量孔隙溶液中的离子在外加电场下通过混凝土传输的容易程度（电导率越高，传输速率越大）。 电阻率或电导率是一种材料特性，取决于孔隙体积、孔隙结构（大小和连通性）、孔隙溶液组成、混凝土试样的饱和度和试样温度。已知影响混凝土电阻率和抗氯离子渗透性的混凝土混合物特性包括水-水泥基材料比、火山灰、矿渣水泥、聚合物外加剂的存在、夹带空气、骨料类型、骨料体积分数、固结度、养护方法和龄期。 5.2 混凝土的体积电阻率与其体积电导率成反比。体积电导率也可以通过测试方法测量 C1760 ，使用试验方法中所述的仪器 C1202 . 然而，该测试方法使用了专门设计用于测量体积电导率或体积电阻率的仪器。 5.3 在模拟孔隙溶液中调节的目的是使试样达到毛细管孔和凝胶孔接近完全饱和的水平。在比较两个不同的混凝土试件时，重要的是，使用相同的溶液调节两个试件，使其尽可能接近可比较的饱和状态，以便以有意义的方式比较数值。 这对于使用测量的电阻率或电导率以及其他信息来估计扩散率尤其如此。 5.4 混凝土的体积电阻率或电导率可以快速指示其抗氯离子渗透性和抗其他流体渗透性。电阻率或电导率测量结果与其他电气指示测试（包括测试方法）具有良好的相关性 C1202 ( 1. , 2. , 3. ) . 5. 体电阻率结果与使用测试方法确定的体扩散具有良好的相关性 C1556 在相同混凝土混合物的配对模制圆柱体上 ( 4. ) .

1.1 This test method covers the determination of the bulk electrical resistivity or conductivity of molded specimens or cored sections of hardened concrete after immersion in water saturated with a simulated pore solution in order to provide a rapid indication of its resistance to the penetration of fluids and dissolved aggressive ions. 1.2 The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. If required results obtained from another standard are not reported in the same system of units as used by this standard, it is permitted to convert those results using the conversion factors found in the SI Quick Reference Guide. 2 1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this 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. ( Warning— Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.) 3 For specific warning statement see 8.1.2 . 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 ====== 5.1 The electrical resistivity of a concrete is the opposition to the movement of ions under an applied electric field. The electrical conductivity of a concrete is a measure of how readily the ions in the pore solution can be transported through the concrete under an applied electric field (the higher the conductivity, the greater the rate of transport). The electrical resistivity or conductivity is a material property that depends upon the pore volume, the pore structure (size and connectivity), the pore solution composition, the degree of saturation of the concrete specimen, and the specimen’s temperature. Concrete mixture characteristics that are known to affect concrete electrical resistivity, as well as resistance to chloride ion penetration, include water-cementitious materials ratio, pozzolans, slag cement, the presence of polymeric admixtures, air-entrainment, aggregate type, aggregate volume fraction, degree of consolidation, curing method, and age. 5.2 The bulk electrical resistivity of concrete is the inverse of its bulk electrical conductivity. Bulk electrical conductivity can also be measured by Test Method C1760 , which uses the apparatus described in Test Method C1202 . This test method, however, uses apparatus specifically designed to measure bulk conductivity or bulk resistivity. 5.3 The purpose of conditioning in a simulated pore solution is to bring the specimen to a level of near complete saturation of the capillary and gel pores. When comparing two different concrete specimens, it is important to condition both specimens as close as possible to a comparable saturation state, using the same solution for conditioning, so that values can be compared in a meaningful way. This is particularly true for using the measured resistivity or conductivity, along with other information, to estimate the diffusivity. 5.4 The bulk electrical resistivity or conductivity of concrete can provide a rapid indication of its resistance to chloride ion penetration and resistance to penetration of other fluids. Resistivity or conductivity measurements have shown good correlations with other electrical indication tests including Test Method C1202 ( 1 , 2 , 3 ) . 5 Bulk electrical resistivity results have shown good correlation with bulk diffusion determined using Test Method C1556 on companion molded cylinders from the same concrete mixtures ( 4 ) .