1.1 本试验方法包括使用玻璃比重计在实验室测定规范中定义的稀释沥青的密度、比重或API比重 D2026 , D2027 和 D2028 ( 注1 ). 在方便的温度下，在比重计上测量值，密度、比重和API比重读数降至15 °C或60 °F，采用国际标准表格。通过这些相同的表格，在三个测量系统中的一个系统中确定的值可以转换为两个系统中的等效值，以便可以使用当地方便的单位进行测量。 注1: 本试验方法适用于稀释沥青，通常遵循，但提供了比试验方法中概述的程序更明确的程序 D1298号 . 1.2 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。 1.3 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。 第节给出了具体的预防说明 7. . 1.4 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 精确测定稀释沥青的密度、比重或API比重是将测量体积转换为15℃标准温度下体积的必要条件 °C或60 °F。 5.2 同样，根据其他ASTM稀释沥青试验的要求，将体积转换为质量需要准确测定。 5.3 数值修正为15 °C和60 °F将不同，因为两个温度不相等。

1.1 This test method covers the laboratory determination, using a glass hydrometer, of the density, specific gravity, or API gravity of cutback asphalts as defined in Specifications D2026 , D2027 , and D2028 ( Note 1 ). Values are measured on a hydrometer at convenient temperatures, readings of density, specific gravity, and API gravity being reduced to 15 °C or 60 °F by means of international standard tables. By means of these same tables, values determined in one of the three systems of measurement are convertible to equivalent values in either system so that measurements may be made in the units of local convenience. Note 1: This test method is applicable to cutback asphalts and in general follows, but provides more explicit routines than, the procedure outlined in Test Method D1298 . 1.2 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. 1.3 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. Specific precautionary statements are given in Section 7 . 1.4 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 Accurate determination of the density, specific gravity, or API gravity of cutback asphalts is necessary for the conversion of measured volumes to volumes at the standard temperature of 15 °C or 60 °F. 5.2 Similarly, accurate determination is necessary for converting volumes to mass as required in other ASTM tests on cutback asphalts. 5.3 Values corrected to 15 °C and 60 °F will be different because the two temperatures are not equal.