1.1 该实践旨在使用旋转蒸发器从溶剂中回收沥青，以确保回收过程中沥青性质的变化最小化。 1.2 以SI单位或英寸-磅单位表示的值应单独视为标准值。每个系统中陈述的值可能不完全等同；因此，每个系统应独立使用。合并两个系统的值可能导致不符合标准。 1.2.1 残余压力测量值以SI单位kPa和常用的非标准等效单位“mm of Hg”显示。 1.2.2 体积和质量的测量仅以SI单位给出，因为它们是在执行本标准实践时通常在实践中使用的唯一单位。1.3 本标准的正文参考了提供解释材料的注释和脚注。这些注释和脚注（不包括表格和图表中的注释和脚注）不应被视为标准的要求。 1.4 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 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》中确立的国际公认的标准化原则制定的。======意义和用途====== 4.1 为了确定沥青铺路混合物中沥青的特性，有必要通过合适的溶剂从集料中提取沥青，然后从溶剂中回收沥青而不显著改变沥青的特性。通过该实践从溶剂中回收的沥青可以使用与原始沥青水泥相同的方法进行测试，并且可以在原始沥青和回收沥青的性质之间进行比较。 附注1: 本标准产生的结果的质量取决于执行该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 通常被认为能够胜任和客观的测试、取样、检查等。本标准的使用者应注意符合规范 D3666 单独并不能完全确保可靠的结果。可靠的结果取决于许多因素；遵循规范的建议 D3666 或者一些类似的可接受的指南提供了评估和控制这些因素中的一些的方法。

1.1 This practice is intended to recover asphalt from a solvent using the rotary evaporator to ensure that changes in the asphalt properties during the recovery process are minimized. 1.2 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. 1.2.1 Residual pressure measurements are shown in both the SI unit of kPa and the commonly used non-standard equivalent unit of “mm of Hg.” 1.2.2 Measurements of volume and mass are only given in SI units because they are the only units typically used in practice when performing this standard practice. 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 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 In order to determine the characteristics of the asphalt in an asphalt paving mixture, it is necessary to extract the asphalt from the aggregate by means of a suitable solvent and then to recover the asphalt from the solvent without significantly changing the asphalt's properties. The asphalt recovered from the solvent by this practice can be tested using the same methods as for the original asphalt cement, and comparisons between the properties of the original and recovered asphalt can be made. Note 1: 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.