1.1 本指南提供了在已知静态、稳态或冲击载荷的正下方或径向向外（偏移）位置测量路面表面挠度的程序信息。挠度是用传感器测量的，传感器监测由于荷载引起的路面垂直移动。本指南描述了使用各种挠度测试设备进行挠度测量的程序，并提供了无论使用何种类型的测试设备都应获得的一般信息。 1.2 本指南适用于在柔性沥青混凝土（AC）、刚性波特兰水泥混凝土（PCC）或复合材料（AC/PCC）路面上进行的挠度测量。 刚性路面可以是普通、有接缝、有接缝钢筋或连续钢筋混凝土。 1.3 以国际单位制表示的数值应视为标准值。括号中的英寸-磅单位仅供参考。 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。 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 路面表面挠度的无损检测测量提供了可用于新路面或在用路面结构评估的信息。这些挠度测量可用于确定以下路面特性: 5.1.1 每层的模量。 5.1.2 路面系统的整体刚度。 5.1.3 PCC路面接缝的荷载传递效率。 5.1.4 路基反力模量。 5.1.5 有效厚度、结构数量或土壤支撑值。 5.1.6 路面的承载能力。 5.2 这些参数可用于分析和设计重建和修复的柔性和刚性路面、路面结构充分性评估，包括PCC路面的接缝效率、PCC路面中的空隙检测、研究和/或网络结构库存。

1.1 This guide provides procedural information for measuring pavement surface deflections, directly under, or at locations radially outward (offset) from a known static, steady-state, or impulse load. Deflections are measured with sensors that monitor the vertical movement of a pavement surface due to the load. This guide describes procedures for the deflection measurement using various deflection testing devices and provides the general information that should be obtained regardless of the type of testing device used. 1.2 This guide is applicable for deflection measurements performed on flexible asphalt concrete (AC), rigid portland cement concrete (PCC), or composite (AC/PCC) pavements. Rigid pavements may be plain, jointed, jointed reinforced, or continuously reinforced concrete. 1.3 The values stated in SI units are to be regarded as standard. Inch-pound units given in parentheses are for information purposes only. 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. 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 NDT measurement of pavement surface deflections provides information that can be used for the structural evaluation of new or in-service pavements. These deflection measurements may be used to determine the following pavement characteristics: 5.1.1 Modulus of each layer. 5.1.2 Overall stiffness of the pavement system. 5.1.3 Load transfer efficiency of PCC pavement joints. 5.1.4 Modulus of subgrade reaction. 5.1.5 Effective thickness, structural number, or soil support value. 5.1.6 Bearing capacity or load carrying capacity of a pavement. 5.2 These parameters may be used for the analysis and design of reconstructed and rehabilitated flexible and rigid pavements, pavement structural adequacy assessment including joint efficiency of PCC pavement, void detection in PCC pavement, research, and/or network structural inventory purposes.