1.1 本试验方法涵盖了使用实验室制备的或单调测试的路芯沥青混合料样品的半圆弯曲（SCB）几何形状在中间温度下制备、测试和测量沥青混合料抗裂性的程序。SCB样品是一个带有切口的半圆盘，切口与测试负载垂直对齐。该测试方法描述了临界应变能释放速率参数的确定， J c ，以及根据负载确定的其他参数- 位移曲线。这些参数可用于对沥青混合料的抗裂性进行分级。 1.2 本标准的文本引用了提供解释性材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应被视为本标准的要求。 1.3 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.4 由于尚未制定本标准的完整精度和偏差声明，因此该测试方法仅用于研究和信息目的。 因此，本标准不应用于验收或拒绝用于采购目的的材料。 1.5 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====== 5.1 临界应变能释放速率参数， J c ，用于比较使用不同沥青粘合剂和骨料类型制备的沥青混合物的抗裂性，所述沥青粘合剂和集料类型是为了满足在中间温度下测试的不同交通水平的体积要求而制备的。 5.2 临界应变能释放速率参数， J c ，是一种工程性质，也是中温开裂时的性能指标。 注1: 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 第3666页 通常被认为能够进行合格和客观的测试、取样、检查等。本标准的用户应注意遵守规范 第3666页 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；遵循规范的建议 第3666页 或者一些类似的可接受的准则提供了评估和控制这些因素中的一些因素的手段。

1.1 This test method covers the procedures for preparation, testing, and measurement of asphalt mixture cracking resistance at intermediate temperatures using semi-circular bend (SCB) geometry of laboratory-prepared or pavement core asphalt mixture samples tested monotonically. The SCB sample is a half-disk with a notch cut aligned vertically in parallel with the testing loading. The test method describes the determination of the critical strain energy release rate parameter, J c , and other parameters determined from the load-displacement curve. These parameters can be used to rank the resistance of asphalt mixtures to cracking. 1.2 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. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 Since a complete Precision and Bias statement for this standard has not been developed, the test method is to be used for research and informational purposes only. Therefore, this standard should not be used for acceptance or rejection of a material for purchasing purposes. 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 critical strain energy release rate parameter, J c , is used to compare the cracking resistance of asphalt mixtures prepared with different asphalt binder and aggregate types prepared to meet the volumetric requirements of differing traffic levels tested at intermediate temperatures. 5.2 The critical strain energy release rate parameter, J c , is an engineering property and a performance indicator at intermediate temperature cracking. 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.