1.1 本试验方法涵盖了使用能够模拟类似于沥青混合料试样产生的加载条件的仪器测量Superpave旋转压实机（SGC）内部旋转角度的程序。 1.2 单位- 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。以每分钟旋转数为单位给出的值用于提供有关常用单位的信息。 1.2.1 IEEE/ASTM SI 10 ，美国公制实践国家标准，提供了在以下情况下使用十进制度数表示平面角度（相对于弧度）和每分钟转数表示回转率（相对于每秒弧度）的指南: IEEE/ASTM SI 10 在最低限度上使用时的系统。 1.3 本试验方法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（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。 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 SGCs用于在实验室制作沥青混合料样本，以评估体积特性并预测路面性能。根据试验方法制造SGC试样 D6925 ，将松散的沥青混合料放置在金属模具内，然后将其放置在SGC中。当模具以名义上恒定的角度（称为内部旋转角度）和速率旋转时，向样品施加恒定的固结压力。用试验方法测量的沥青样品密度的稠度 D2726/D2726M 或 D6752/D6752M 对所进行测试的有效性非常重要。当SGC在压实过程中保持恒定压力和已知恒定内部旋转角时，会产生密度一致的试样。 5.2 SGC有多个制造商和型号。每个模型都采用了一种独特的方法来设置、诱导和保持内部旋转角度。每个模型还采用独特的校准系统来测量外部旋转角度。这些现有的校准系统不能普遍用于所有商用的不同SGC模型。不同SGC模型产生的沥青样本的不一致性至少部分归因于旋转角度的变化。 5.3 该方法描述了可用于在模拟负载条件下独立测量任何制造商SGC模型内部旋转角度的仪器和过程。 仪器底盘的外部形状确保模具端板和仪器之间的物理接触点位于距离旋转轴固定且已知的距离处。因此，在这些固定点施加垂直载荷，在模具的每一端产生倾斜力矩。 5.4 除非另有规定，否则倾斜力矩为466.5 测量时，仪器应将N-m应用于SGC。 注1: 本试验方法产生的结果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 通常认为能够胜任和客观的测试、抽样、检查等。本测试方法的用户应注意遵守规范 D3666 单独使用并不能完全确保可靠的结果。可靠的结果取决于许多因素；遵循规范建议 D3666 或一些类似的可接受指南提供了评估和控制其中一些因素的方法。 注2: 466.5 N-m的倾斜力矩对应于AFLS1上22 mm的偏心装置或DAVII-HMS上21°的锥角，外加载荷为10603 N（在直径150 mm的试样设置下为600 kPa）。

1.1 This test method covers the procedure for the measurement of the Superpave Gyratory Compactor (SGC) internal angle of gyration using an instrument capable of simulating loading conditions similar to those created by an asphalt mixture specimen. 1.2 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. The value given in rotations per minute is provided for information regarding commonly used units. 1.2.1 IEEE/ASTM SI 10 , American National Standard for Metric Practice, offers guidance where use of decimal degrees for plane angles (versus radians) and revolutions per minute for rate of gyration (versus radians per second) is acceptable within the IEEE/ASTM SI 10 system when used on a minimal basis. 1.3 The text of this test method 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 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 ====== 5.1 SGCs are used to produce asphalt mixture specimens in the laboratory to assess volumetric properties and predict pavement performance. In the fabrication of an SGC specimen in accordance with Test Method D6925 , loose asphalt mixture is placed inside a metal mold, which is then placed into an SGC. A constant consolidation pressure is applied to the sample while the mold gyrates at a nominally constant angle (referred to as the internal angle of gyration) and rate. Consistency in the density of the asphalt specimens produced as measured by Test Method D2726/D2726M or D6752/D6752M is very important to the validity of the tests performed. Specimens of a consistent density are produced when an SGC maintains a constant pressure and a known constant internal angle of gyration during the compaction process. 5.2 There are several manufacturers and models of SGC. Each model employs a unique method of setting, inducing, and maintaining the internal angle of gyration. Each model also employs a unique calibration system to measure the external angle of gyration. These existing calibration systems cannot be used universally on all of the different SGC models commercially available. Inconsistencies in asphalt specimens produced on different SGC models have been at least partially attributed to variations in the angle of gyration. 5.3 This method describes instruments and processes that can be used to independently measure the internal angle of gyration of any manufacturer’s SGC model under simulated loading conditions. The external shape of the instrument chassis ensures that the points of physical contact between the mold end plates and the instrument occur at a fixed and known distance away from the axis of gyration. As a result, the vertical load is applied at these fixed points, creating tilting moments at each end of the mold. 5.4 Unless otherwise specified, a tilting moment of 466.5 N-m shall be applied to the SGC by the instrument while making this measurement. Note 1: The quality of the results produced by this test method 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 test method 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. Note 2: A 466.5 N-m tilting moment corresponds to a 22 mm eccentric on the AFLS1 or a 21° cone angle on the DAVII-HMS with an applied load of 10603 N (600 kPa at a 150 mm diameter specimen setting).