1.1 本规程涵盖了根据路面宏观结构剖面计算平均剖面深度。 1.2 平均剖面深度已被证明可用于预测湿路面摩擦的速度常数（梯度）。 1.3 平均剖面深度的线性变换可以提供根据测试方法测量的平均纹理深度的估计 E965 。 注1: ISO 13473-1中提出了一种类似的MPD测量和计算方法。唯一的技术差异是尖峰去除和极端MSD去除的计算方式。 尽管存在这些差异，但ASTM和ISO方法将得出相同的结果，在正常情况下只有微不足道的差异。ASTM去除尖峰的方法应用的计算要复杂得多，但会导致去除尖峰附近的样本不太正确。ASTM方法中的极端MSD去除也将比ISO方法更精确，但代价是更复杂的计算。显著的差异可能只出现在一些不常见或特殊的纹理上，例如有凹痕或有凹槽的水泥混凝土路面。 在接下来的几年里，将尝试协调计算，以使两种标准中的计算完全相同。ISO标准包括八个附加信息的附件，例如关于不确定性计算以及用户如何根据标准纹理轮廓检查软件。ISO 13473-1标准中将包含与此相对应的注释。 1.4 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 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 这种做法适用于根据剖面数据计算平均宏观纹理深度。该计算结果（MPD）已被证明可用于预测湿路面摩擦的速度相关性。 5.2 MPD可用于根据测试方法使用体积技术来估计宏观纹理深度的测量结果 E965 MPD和MTD的值不同，这是由于在体积技术中使用的玻璃球的有限尺寸，并且因为MPD是从两个- 三维轮廓而不是三维表面。因此，必须使用一个变换方程。 注2: 这两个概念密切相关，具有很强的相关性；这些相关性可能因用于建立相关性的路面类型而异。尽管它们的物理特性不同，但MPD测量技术旨在取代手动MTD测量。 5.3 此做法可用于实际路面或岩芯或实验室的路面宏观纹理剖面- 制备样品。 5.4 骨料的尺寸、形状和分布是本实践中未涉及的特征。这种做法并不意味着提供纹理特征的完整评估。特别是，在解释多孔或有凹槽表面的结果时应小心。 5.5 这种做法没有解决与获得测量轮廓相关的问题。测量轮廓的激光或其他光学非接触方法通常是优选的。然而，如果正确执行，使用触笔的接触方法也可以提供准确的轮廓。

1.1 This practice covers the calculation of mean profile depth from a profile of pavement macrotexture. 1.2 The mean profile depth has been shown to be useful in predicting the speed constant (gradient) of wet pavement friction. 1.3 A linear transformation of the mean profile depth can provide an estimate of the mean texture depth measured according to Test Method E965 . Note 1: A similar method for measurement and calculation of MPD is presented in ISO 13473-1. The only technical differences are the way spike removal and extreme MSD removal are calculated. Despite these differences, the ASTM and ISO methods will arrive at the same results, with only insignificant differences in normal cases. The ASTM method for spike removal applies calculations which are much more complicated but will result in less correct samples which are adjacent to spikes being removed. The extreme MSD removal in the ASTM method will also be more precise than the ISO method, but at the expense of more complicated calculations. Significant differences will potentially appear only on some uncommon or special textures, such as tined or grooved cement concrete pavements. In the next few years, attempts will be made to coordinate the calculations with a view to make them identical in both standards. The ISO standard includes eight annexes with additional information, for example about uncertainty calculations and how users can check their software against standard texture profiles. A note corresponding to this one will be included in the ISO 13473-1 standard. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 This practice is suitable for the calculation of the average macrotexture depth from profile data. The results of this calculation (MPD) have proven to be useful in the prediction of the speed dependence of wet pavement friction. 5.2 The MPD can be used to estimate the result of a measurement of macrotexture depth using a volumetric technique according to Test Method E965 . The values of MPD and MTD differ due to the finite size of the glass spheres used in the volumetric technique and because the MPD is derived from a two-dimensional profile rather than a three-dimensional surface. Therefore, a transformation equation must be used. Note 2: The two concepts are closely related and have strong correlations; these correlations can differ depending on the pavement types used to establish the correlation. Although they are not the same physical characteristic, the MPD measurement technique is intended to replace the manual MTD measurements. 5.3 This practice may be used with pavement macrotexture profiles taken on actual road surfaces or from cores or laboratory-prepared samples. 5.4 Aggregate size, shape, and distribution are features which are not addressed in this practice. This practice is not meant to provide a complete assessment of texture characteristics. In particular, care should be used when interpreting the result for porous or grooved surfaces. 5.5 This practice does not address the problems associated with obtaining a measured profile. Laser or other optical noncontact methods of measuring profiles are usually preferred. However, contact methods using a stylus also can provide accurate profiles if properly performed.