Development of Models to Estimate the Subgrade and Subbase Layers' Resilient Modulus from In Situ Devices Test Results for Construction Control

摘要

The objective of this study was to develop resilient modulus prediction models for possible application in the quality control/quality assurance (QC/QA) procedures during and after the construction of pavement layers. Field and laboratory testing programs were conducted to achieve this objective. The field testing program included conducting GeoGauge, light falling weight deflectometer, and dynamic cone penetrometer in situ tests. The laboratory program included performing repeated load triaxial resilient modulus tests and physical properties and compaction tests on soil tested in the field. A total of four cohesive soil types and three types of granular materials at different moisture-dry unit weight levels were considered. Comprehensive statistical analyses were conducted on the field and laboratory test results. Regression models that correlate the resilient modulus to the results of different in situ test devices and soil physical properties were developed. A good agreement was observed between the predicted and measured values of the resilient modulus. The results of this research study demonstrated a promising role of the different in situ tests considered in the QC/QA procedures of the construction of pavement layers.