1.1 这些试验方法包括通过使用中子热化技术的仪器检查试样来确定未压实沥青混合料（试验方法A）和实验室压实沥青混合料试样（试验方法B）中沥青含量的程序。 1.2 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 目前尚未制定本标准中方法B的精度和偏差声明。因此，方法B不应用于验收或拒收用于采购目的的材料。 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。 参见第节 6. 和 8.4.2 , 8.5.6 和 附注4 针对特定危险。 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====== 3.1 这些试验方法作为一种快速、无损的技术，可用于测定沥青混合料中的沥青含量。 3.2 这些测试方法适用于施工和研发应用的质量控制和验收测试。该试验方法仅用于测定沥青含量，因为它不提供用于级配分析的提取骨料。 3.3 测试的非破坏性允许在单个测试样本上进行重复测量，以对测试数据进行统计分析。 3.4 这些试验方法通过将测得的沥青含量与先前建立的校准数据进行比较来确定试样的沥青含量。 3.4.1 以百分比表示的材料沥青含量是指给定质量材料中的沥青质量与样品总质量或固体材料颗粒质量的比率。

1.1 These test methods cover the procedures for determining the asphalt content of samples of uncompacted asphalt mixtures (Test Method A), and of laboratory compacted specimens of asphalt mixtures (Test Method B) by examining a test sample with an apparatus that utilizes neutron thermalization techniques. 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. 1.3 A precision and bias statement for Method B in this standard has not been developed at this time. Therefore, Method B should not be used for acceptance or rejection of a material for purchasing purposes. 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. See Section 6 and 8.4.2 , 8.5.6 , and Note 4 for specific hazards. 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 ====== 3.1 These test methods are useful as a rapid, nondestructive technique for determination of asphalt content of asphalt mixtures. 3.2 These test methods are suitable for quality control and acceptance testing for construction and for research and development applications. The test method is used for determination of asphalt content only as it does not provide extracted aggregate for gradation analysis. 3.3 The nondestructive nature of the test allows repetitive measurements to be made on a single test sample for statistical analysis of test data. 3.4 These test methods determine the asphalt content of a test sample by comparing the measured asphalt content with previously established calibration data. 3.4.1 The asphalt content of a material expressed as a percentage is the ratio of the mass of asphalt in a given mass of material to the total mass of the sample or to the mass of the solid material particles.