1.1 本规程涵盖从路面的数字2D图像或3D数据（或两者）对路面裂缝进行量化。 1.2 本标准的目标是消除生成开裂指数过程中的人为主观性和干预，客观地定义开裂指标和其他所需参数，并使标准的所有用户能够在给定相同开裂数据的情况下生成相同的开裂指数。 1.3 开裂指数是无单位的，根据本标准中定义的长度、宽度和面积的基本测量值以简单的方式计算。 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。 第节给出了具体的预防说明 7. . 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 PSCI提供了在路面上观察到的裂缝的测量值。 它为评定路面裂缝提供了定量和合理的基础，以帮助确定维护和维修需求及优先级。PSCI的定期监测可用于建立对路面性能的反馈，以验证或改进当前的路面设计和维护程序。PSCI根据PSCM计算。 5.2 PSCM使用开裂引起的路面表面的开口度或孔径大小作为目标函数。这是由于裂缝导致的表面完整性的测量，该裂缝与可能容纳地表水的区域有关。 5.3 它还与表面水平拉伸完整性的损失有关，因为这与裂纹的总长度和粒间载荷传递成正比，而粒间载荷传递部分与裂纹宽度有关。 5.4 然而，它是一种纯粹的物理尺寸测量，并且事先不依赖于开裂的原因或类型。 5.5 裂缝原因或其对路面性能的影响的任何评估将与与与特定用途相关的其他因素一起独立进行，如下文所述。 5.6 密封裂缝、凹坑和修补不包括在PSCM和PSCI计算中。

1.1 This practice covers the quantification of pavement surface cracking from digital 2D images or 3D data (or both) of the pavement surface. 1.2 The objectives of this standard are to eliminate human subjectivity and intervention in the process of generating cracking indices, to define cracking metrics and other required parameters objectively, and to enable all users of the standard to produce the same cracking indices given the same cracking data. 1.3 The cracking indices are unitless and are calculated in a straightforward manner from fundamental measurements of length, width, and area as defined in this 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. Specific precautionary statements are given in Section 7 . 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 The PSCI provides a measure of the cracking observed on the pavement surface. It provides a quantitative and rational basis for rating pavement surface cracking to aid in determining maintenance and repair needs and priorities. Periodic monitoring of the PSCI can be used to establish feedback on pavement performance for validation or improvement of current pavement design and maintenance procedures. The PSCI is calculated from the PSCM. 5.2 The PSCM uses the openness or aperture size of the pavement surfacing caused by cracking as the objective function. This is a measure of the surface integrity due to cracking that relates to the area that could potentially admit surface water. 5.3 It also relates to the loss of horizontal tensile integrity at the surface because that is proportional to the total length of cracks and to interparticle load transfer, which is related in part to crack width. 5.4 It is, however, a purely physical dimensional measure and has no prior dependency on cause or type of cracking. 5.5 Any evaluation of the cause of the cracking, or of its impact on pavement performance, would be made independently together with other factors relevant to the particular purpose, as elaborated later. 5.6 Sealed cracks, potholes, and patching are not included in the PSCM and PSCI calculations.