Abstract

This project examined the use of the light weight deflectometer (LWD) and the air permeameter test (APT) for control of the state of compaction and hydraulic conductivity of aggregate drainage layers. The investigation included an extensive program of LWDs, APTs, and nuclear density tests on two testing strips constructed at an experimental site—one on an untreated subgrade and the other on cement-treated subgrade, The project also included additional field tests at three construction sites in Indiana and a laboratory testing program for calibration and validation of the field data. Statistics and correlation studies of the collected data are presented and serve as a basis for assessing the testing methods and the influence of statistical sample size on the reliability of QA/QC outputs. The main outcomes address the spatial variability in the measured properties, the evaluation of materials and methods used to construct the strips, and the methods used for characterizing the layers. These findings highlight opportunities for assessing uncertainty, as measured by the dispersion of the data as part of a QA/QC campaign, and for reformulating guidelines in probabilistic terms.

Keywords

pavement drainage layers, aggregates, hydraulic conductivity, compressibility, compaction, dry density, aggregate segregation, light weight deflectometer, air permeameter test, image analysis, subgrade, cement treated soils

Report Number

FHWA/IN/JTRP-2024/28

SPR Number

4327

Performing Organization

Joint Transportation Research Program

Publisher Place

West Lafayette, Indiana

Date of Version

2024

DOI

10.5703/1288284317769

Additional Files
SPR-4327 Technical Summary.pdf (343 kB)
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