Standard Test Method for Measuring Deformations Using a Lightweight Deflectometer (LWD)

This document establishes a standardized procedure for evaluating the performance of lightweight deflectometers. It outlines specific protocols to ensure that measurements of ground deformation are conducted consistently across various testing environments. The method focuses on defining the operational requirements and acceptance criteria necessary for reliable data collection during field assessments. By adhering to these guidelines, practitioners can achieve uniformity in how deformation characteristics are recorded and reported. The text details the configuration of the equipment, the sequence of loading operations, and the calculation methods for interpreting the deflection basins obtained. It serves as a technical reference for personnel involved in geotechnical investigations and pavement evaluation. The procedures described aim to minimize variability in results caused by differences in equipment calibration or operator technique. Implementation of these guidelines supports the generation of comparable datasets essential for engineering analysis and decision-making processes regarding subgrade and pavement structure integrity.