AASHTO T 256-01（2020）提供了直接在已知静态、稳态或脉冲荷载下方或径向向外（偏移）位置测量路面挠度的标准。挠度是通过传感器测量的，传感器监测路面因荷载而产生的垂直移动。本试验方法描述了使用各种挠度试验装置进行挠度测量的程序，并提供了应获得的一般信息，无论所使用的试验装置类型如何。本试验方法适用于柔性沥青混凝土（AC）、刚性硅酸盐水泥混凝土（PCC）或复合材料（AC/PCC）路面上的挠度测量。 刚性路面可以是普通的、有接缝的、有接缝的钢筋混凝土或连续加固或断裂的混凝土。

AASHTO T 256-01 (2020) provides standards 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 test method 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.This test method 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 or fractured concrete.