Standard Test Method for Measuring Target Modulus Using Light Weight Deflectometer (LWD) on Compacted Proctor Mold Samples

Importancia y uso:

5.1 LWDs are intended to be used as a tool to ensure adequate compaction of unbound materials. Adequate soil compaction of infrastructure projects will provide load capacity, stability of the soil, decrease permeability, and prevent or reduce the settlement of supported pavements and structures. The target modulus or deflections are used to establish QA/QC acceptance criteria for the LWD tests in the field.

5.2 This test method covers the determination of target acceptance modulus values of unbound materials based on measuring LWD deflections on laboratory proctor mold samples at varying moisture contents.

5.3 This standard test method provides a target modulus calculation that accounts for the constrained conditions (in the compaction mold) of the test sample. The intent is to be able to compare the results from the laboratory samples to those of similar materials in the field at similar stress levels.5

5.4 The target modulus or deflections may be either correlated directly to pavement or structure performance or used to determine in situ material characteristics of the pavement or structure foundation layers.6

Subcomité:

E17.41

Volúmen:

04.03

Número ICS:

17.100 (Measurement of force, weight and pressure)

Palabras clave:

compaction QC/QA; light weight deflectometer (LWD); nondestructive testing (NDT); pavement deflection; pavement foundation layer; portable falling weight deflectometer (PFWD); portable impulse plate load; stiffness; target modulus;