1.1本试验方法涵盖了纹理的连通性，因为它与路面通过其表面和地下孔隙的排水能力有关。这是一种特殊装置，用于计算已知量的水在重力作用下通过被测结构路面纹理中的空隙所需的时间。该技术旨在测量路面释放车辆轮胎表面压力的能力，从而指示潮湿条件下的滑水潜力。较快的逃逸时间表明，轮胎和路面之间可能存在较薄的水膜，因此可能会暴露出更多微观纹理，使轮胎表面凹陷，并使轮胎产生更多的表面摩擦。排水所需的秒数越低，轮胎下的水压越低。由操作员将本测试结果与其他相关因素进行比较，如预期降雨强度和频率、骨料类型、纹理一致性、坡度、坡度、预期车速和事故历史，以确定流出流量计读数与给定表面上滑水的可能性之间的关系。 在所有其他因素相似的情况下，将已知有水力滑翔历史的路面的流出流量计读数与有良好历史的路面进行比较，将为操作员提供促进潮湿天气安全所需的流出流量计编号。 1.2使用该方法获得的结果与铺砌表面的平均水力半径相关，并可能与其他测量纹理的方法相关。 1.3使用本试验方法获得的结果与平均纹理深度（MTD）有关。 1.4以国际单位制表示的数值视为标准值。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确定限制。 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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 本试验方法适用于现场试验，以评估表面排水，在某些情况下，评估路面表层的内部排水。当与其他试验一起使用时，流出时间可用于评估沥青路面混合料、波特兰水泥路面上使用的修整方法和旧路面上的修补操作产生的纹理。测试结果将与其他方法相关，如连续油管流量计（测试方法E 2157 )，MPD（规程E 1845 )和MTD（试验方法E 965 ). 笔记 1-流出时间的倒数与MPD高度相关，除非表面具有高度多孔性，因为MPD是表面纹理的测量值，不考虑流经表面孔隙的水。 通过该方法测量的流出时间仅为指示，并不意味着对路面摩擦或潮湿天气安全特性进行完整评估。 本试验方法不一定与其他测量路面特性的方法相关或一致。由操作员确定所考虑的每种方法的相关性。

1.1 This test method covers the connectivity of the texture as it relates to the drainage capability of the pavement through its surface and subsurface voids. This is a specific device that times how long it takes a known quantity of water, under gravitational pull, to escape through voids in the pavement texture of the structure being tested. The technique is intended to provide a measure of the ability of the pavement to relieve pressure from the face of vehicular tires and thus an indication of hydroplaning potential under wet conditions. A faster escape time indicates a thinner film of water may exist between the tire and the pavement, thus more micro-texture could be exposed to indent the face of the tire and more surface friction available to the tire. The lower the number of seconds it takes to evacuate the water, the lower the water pressure under the tire. It will be up to the operator to compare the results of this test to other pertinent factors such as expected rainfall intensity and frequency, aggregate type, consistency of texture, grade, slope, expected vehicular speed, and accident history, to determine the relationship between the outflow meter reading and the likelihood of hydroplaning on a given surface. Comparing the outflow meter reading of a pavement known to have a history of hydroplaning, against one with a good history, with all other factors similar, will give the operator an indication of the outflow meter number that will be necessary to promote wet weather safety. 1.2 The results obtained using this method are related to the mean hydraulic radius of a paved surface and may correlate with other methods to measure texture. 1.3 The results obtained using this test method are related to the mean texture depth (MTD). 1.4 The values stated in SI units are considered standard. 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 limitations prior to use. 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== This test method is suitable as a field test to evaluate the surface drainage, and in some cases, the internal drainage of the surface course of a pavement. When used with other tests, the outflow time may be used to evaluate the texture produced by an asphalt pavement mix, a finishing method used on Portland Cement Pavement, and refinishing operations on an old pavement surface. Test results will correlate with other methods such as the CTMeter (Test Method E 2157 ), MPD (Practice E 1845 ) and MTD (Test Method E 965 ). Note 1—The reciprocal of the outflow time is highly correlated with the MPD except when the surface is highly porous since the MPD is a measure of the surface texture and does not account for the water flowing through the surface pores. The outflow times measured by this method are an indication only, and are not meant to provide a complete assessment of the pavement surface friction, or wet weather safety characteristics. This test method does not necessarily correlate or agree with other methods of measuring pavement surface characteristics. It is up to the operator to determine the correlation of each method considered.