1.1 本试验方法涵盖了使用实验室制备的圆柱形沥青混合料样品或路面芯样在高温下制备、测试和测量沥青混合料抗车辙性能的程序。试验方法描述了车辙公差指数的测定， 室温 指数 以及由荷载-位移曲线确定的其他参数。这些参数可用于评估沥青混合料的抗车辙性能。 1.2 以国际单位表示的数值视为标准值。本标准不包括其他计量单位。 1.3 本标准的文本参考了提供解释材料的注释和脚注。 这些注释和脚注（表和图中的除外）不应视为本标准的要求。 1.4 根据两个实验室、30个重复试验和10个不同的样品，确定车辙公差指数的实验室内重复性标准偏差为2.42。本试验方法的实验室间再现性正在确定中，将于2026年12月31日或之前提供。因此，本标准不应用于验收或拒收采购材料。 1.5 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。 1.6 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 理想车辙试验（IRT）用于测定沥青混合料在50±15的高温范围内的抗车辙性能 °C，取决于当地气候。试样很容易从Superpave回转压实机（SGC）压实圆柱体中获得，圆柱体直径为150±2 mm，无需切割、粘合、钻孔或仪器。 同样，可以测试直径为150±2 mm的现场芯样，以测量就地沥青混合料的抗车辙性能。 注1: 现场岩芯可能需要切割至38 mm至95 mm的适当厚度。本试验标准不适用于直径大于150±2 mm的试样，无论是实验室压实试样还是现场岩芯。 5.2 这个 室温 指数 沥青混合料的抗剪强度是根据峰值荷载（或抗剪强度）计算的。这个 室温 指数 是沥青混合料抗车辙性能的一个指标，它包含各种沥青粘合剂、沥青粘合剂改性剂和添加剂、骨料混合物、纤维和再生材料。 一般来说 室温 指数 值时，抗车辙性能越好，因此田间车辙深度越小。用户可以使用 室温 指数 以及在配合比设计和生产质量控制/保证期间识别易产生车辙的混合料的相关标准。 注2: 本标准产生的结果的质量取决于执行程序的人员的能力以及所用设备的能力、校准和维护。符合规范标准的机构 D3666型 通常认为能够胜任客观的测试、取样、检验等。本标准的用户应注意遵守规范 D3666型 单独使用并不能完全确保结果的可靠性。可靠的结果取决于许多因素；遵循规范建议 D3666型 或者一些类似的可接受指南提供了评估和控制这些因素的方法。

1.1 This test method covers the procedures for preparing, testing, and measuring asphalt mixture rutting resistance at high temperatures using cylindrical laboratory-prepared asphalt mix samples or pavement cores. The test method describes the determination of the rutting tolerance index, RT Index , and other parameters determined from the load-displacement curve. These parameters can be used to evaluate the resistance of asphalt mixtures to rutting. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.4 The within-laboratory repeatability standard deviation of rutting tolerance index has been determined to be 2.42, based on two labs, 30 test replicates, and ten different samples. The between-laboratory reproducibility of this test method is being determined and will be available on or before December 31, 2026. Therefore, this standard should not be used for acceptance or rejection of a material for purchasing purpose. 1.5 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. 1.6 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 ideal rutting test (IRT) is used to determine asphalt mixture rutting resistance at high temperature in the range of 50 ± 15 °C, depending on local climate. The specimens are readily obtained from Superpave Gyratory Compactor (SGC) compacted cylinders with a diameter of 150 ± 2 mm, with no cutting, gluing, drilling, or instrumentation required. Similarly, field cores with a diameter of 150 ± 2 mm can be tested to measure rutting resistance of in-place asphalt mixtures. Note 1: Field cores may need cutting to a right thickness ranging from 38 mm to 95 mm. This test standard is not applicable to the specimens with a diameter other than 150 ± 2 mm, regardless of laboratory-compacted specimens or field cores. 5.2 The RT Index of an asphalt mixture is calculated from the peak load (or shear strength). The RT Index is a performance indicator of the rutting resistance of asphalt mixtures containing various asphalt binders, asphalt binder modifiers and additives, aggregate blends, fibers, and recycled materials. Generally, the higher the RT Index value, the better the rutting resistance and consequently the smaller the rut depth in the field. Users can employ the RT Index and associated criteria to identify rutting-prone mixtures during mix design and production quality control/assurance. Note 2: The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable of competent and objective testing, sampling, inspection, etc. Users of this standard are cautioned that compliance with Specification D3666 alone does not completely ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors.