1.1 本试验方法涵盖了磁脉冲感应（MPI）装置产生的路面厚度测量的设备、现场程序和结果解释。磁脉冲感应装置会感应弱脉冲磁场，从而在干扰磁场的金属物体中感应涡流。为了使用MPI设备测量路面厚度，需要预先放置金属反射器。当金属反射器进入现场时，通过算法产生和处理电信号，以检测和产生路面厚度的定量值。 1.2 该测试方法还提供了购买和安装反射器以产生准确和可重复结果所需的详细信息，包括配置和冶金。 1.3 该方法适用于素接缝混凝土路面、沥青路面、水泥粘合剂基层和未结合骨料层。它不适用于金属钢筋会干扰磁场的连续加固、网格加固或纤维加固路面。 1.4 MPI设备包括一个感应磁场和收集电信号的装置。 信号信息通过编程到设备固件中的算法收集并处理为路面厚度。 1.5 MPI现场程序描述了从MPI设备收集可靠、可重复和准确结果所需的步骤和过程。对精度至关重要的是在安装沥青或混凝土路面之前预先放置的金属反射器的冶金和配置。此外，要求反射器附近没有任何金属物体，以避免影响测试结果。 1.6 当现场测试期间选择并使用正确的反射镜校准时，MPI结果几乎不需要解释。 1.7 单位- 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 1.8 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。 1.9 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 该测试方法包括间接测量路面厚度，以提供快速、无损的结果。该方法用于确定沥青或混凝土路面施工是否符合厚度规范。 混凝土路面的无损厚度结果显示出良好的相关性（R 2. 数值99.7 %) 使用AASHTO T 148和试验方法直接测量路面厚度 C174/C174M . 5.2 MPI设备的测量结果不受混凝土或沥青材料成分的影响，包括矿渣或其他金属骨料的使用、材料温度或含水量，因此允许安装人员进行质量控制过程，提供可用于控制摊铺操作的结果。此外，生成定量结果以记录为- 建造厚度。 5.3 基础设施所有者使用同一设备执行质量保证活动并接受已安装的设施。其准确性和可重复性允许减少或消除与路面厚度测定相关的取芯要求。

1.1 This test method covers the equipment, field procedures, and interpretation of the results for the pavement thickness measurements produced by a magnetic pulse induction (MPI) device. Magnetic pulse induction devices induce a weak-pulsed magnetic field that causes the induction of eddy currents in metal objects disturbing the field. In order to measure pavement thickness with an MPI device, a pre-placed metal reflector is required. When the metal reflector enters into the field, an electrical signal is produced and processed through algorithms to detect and produce quantitative values for pavement thickness. 1.2 This test method also provides the details including configuration and metallurgy required to purchase and install reflectors to produce accurate and repeatable results. 1.3 This method is intended for use with plain-jointed concrete pavements, asphalt pavements, base courses with cement binders, and unbound aggregate layers. It is not applicable for continuously reinforced, mesh-reinforced, or fiber-reinforced pavement where the metal reinforcement would interfere with the magnetic field. 1.4 MPI equipment includes a device that induces the magnetic field and collects the electrical signal. The signal information is collected and processed into pavement thicknesses through algorithms programmed into the device firmware. 1.5 MPI field procedures describe the steps and processes required to collect reliable, repeatable, and accurate results from the MPI device. Critical to the accuracy are the metallurgy and configuration of the metal reflectors pre-placed prior to installation of the asphalt or concrete pavement. Also, the absence of any metallic object near the reflector is required to avoid influencing the test result. 1.6 MPI results require little interpretation when the correct reflector calibration is selected and used during the field test. 1.7 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.8 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. 1.9 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 This test method covers the indirect measurement of the pavement thickness to provide a rapid, nondestructive result. The method is used to determine the compliance of asphalt or concrete pavement construction with the thickness specifications. The nondestructive thickness results for concrete pavements have shown excellent correlation (R 2 values of 99.7 %) with direct measurement of pavement thickness using AASHTO T 148 and Test Method C174/C174M . 5.2 Measurement results from MPI devices are unaffected by concrete or asphalt material composition, including the use of slag or other metallic aggregates, material temperature, or moisture content, thus allowing installers a quality control process that provides results that can be used in controlling the paving operation. In addition, quantitative results are produced to document as-built thicknesses. 5.3 Infrastructure owners use the same device to perform quality assurance activities and to accept installed facilities. Its accuracy and repeatability allow the reduction or elimination of coring requirements related to pavement thickness determination.