1.1本试验方法包括使用北卡罗来纳州立大学变速摩擦试验机测量铺砌表面或实验室制备的试样的防滑性。 1.2变速摩擦试验机（VST）是一种摆锤式试验机，其下端有一个锁轮光滑的橡胶轮胎。在锁定摆锤轮胎和试样之间的接触路径中，喷嘴沿试样表面引导以选定水试验速度的水流。轮胎和试样之间的摩擦力是根据摆锤中损失的能量测量的。该测试仪适用于路面的现场测试以及实验室使用（见注释1）。 1.3测量值VSN（变速（测试仪）编号）表示使用本文所述的仪器和程序获得的摩擦特性，不一定与通过其他方法获得的摩擦特性一致或直接相关- 电阻测量方法。 注1-现场不平的路面可能会提供不准确的VSN测量。在现场使用VST时应格外小心。 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和健康实践，并确定监管限制的适用性。

1.1 This test method covers the measurement of skid resistance of paved surfaces or laboratory-prepared specimens using the North Carolina State University Variable-Speed Friction Tester. 1.2 The Variable-Speed Friction Tester (VST) is a pendulum-type tester with a locked-wheel smooth rubber tire at its lower end. A stream of water at a selected water test velocity is directed by a nozzle along the specimen surface in the path of contact between the locked-pendulum tire and the specimen. The friction between the tire and the specimen is measured from the energy lost in the pendulum. The tester is suitable for field tests on pavement surfaces as well as laboratory use (see Note 1). 1.3 The values measured, VSN (variable-speed (tester) number), represent the frictional properties obtained with the apparatus and procedures stated herein and do not necessarily agree or correlate directly with those obtained by other skid-resistance measuring methods. Note 1—Uneven pavement surfaces in the field may provide inaccurate VSN measurements. Extreme care should be taken when using the VST in the field. 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 and health practices and determine the applicability of regulatory limitations prior to use.