ASTM D4602-93 (R2020) PDF Download

ASTM D4602-93 (R2020) is a standard guide that provides guidance for the nondestructive testing of pavements using cyclic-loading dynamic deflection equipment. The purpose of this guide is to encourage the collection of sufficient deflection data, proper calibration of equipment, and implementation of general procedures to ensure better quality and more uniform deflection measurements.

The guide covers various aspects of the testing process, including the preparation, equipment, calibration, test point location, applied loads, cyclic frequencies, and presentation of data. It specifically focuses on the use of cyclic-loading dynamic deflection equipment, which applies a steady-state sinusoidal vibration to the pavement through the cyclic generation of a dynamic load. These equipment devices apply a static load on the pavement surface, resulting in a static deflection, and then induce a sinusoidal load and consequent deflection around the static load and deflection through an applied steady-state dynamic load.

The guide acknowledges that there are differences between various cyclic-loading dynamic deflection devices and provides uniformly applicable guidance instead of specific instructions for their use. It emphasizes the importance of equipment calibration according to the manufacturer's recommendations and specifies the necessary data collection for typical applications without providing procedures for advanced calculations or applications.

It is important to note that this guide does not apply to other types of deflection equipment, such as static deflection equipment, automated beam deflection equipment, or impulse deflection equipment.

Furthermore, the guide addresses the use of units in the engineering profession, highlighting the scientific undesirability of combining two separate sets of inch-pound units within a single standard. It recommends using the gravitational system of units when dealing with the inch-pound system.

Lastly, the guide emphasizes that it is not meant to replace education or experience and should be used in conjunction with professional judgment. It highlights that not all aspects of the guide may be applicable in every circumstance and that it does not represent or replace the standard of care in evaluating the adequacy of a professional service.