"The objective of this study was to find an alternative to density measurement with the Nuclear Density Gauge. At the time of this study, the Missouri Department of Transportation maintained and used nearly 90 density gauges. In addition, MoDOT was required to maintain certification and safety training for approximately 450 employees on a yearly basis and to comply with NRC requirements. The cost compliance with NRC regulations in time and dollars had become excessive.
A series of comparison tests was performed on 50 data points in two separate sites of embankment construction for highway construction projects. Comparison testing was performed using the Humboldt Stiffness Gauge (HSG). Nuclear Density Gauge (NDG), Falling Weight Deflectometer (FWD) and Dynamic Cone Penetrometer (DCP). Each of the devices was used in the same location or as close as possible to the same location for each data point. In addition, 10 soil samples were taken after testing in order to evaluate the soil properties, obtain a percentage of rock in the sample and determine the uniformity of the soils.
Data analysis was divided into two parts. The first analysis compared the measurement of the resilient modulus with the FWD, HSG and DCP. The second used the conversion developed by Humboldt manufacturing to compare the actual measurement of dry density, measured with a nuclear density gauge, to the dry density calculated using the HSG.
Resilient modulus data among the three devices did not correlate well. On both data collection sites there was no correlation found among different devices.
The Humboldt conversion gave a good correlation between density and stiffness of the tested soils on both sites"--Abstract, page iii.
Stephenson, Richard Wesley
Elifrits, C. Dale
Civil, Architectural and Environmental Engineering
M.S. in Civil Engineering
University of Missouri--Rolla
ix, 79 pages
© 2002 James Patrick Knutelski, All rights reserved.
Thesis - Restricted Access
Soils -- Density -- Testing
Soil stabilization -- Equipment and supplies
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://laurel.lso.missouri.edu/record=b4974449~S5
Knutelski, James Patrick, "A comparison of the Falling Weight Deflectometer, Dynamic Cone Penetrometer, Nuclear Density Gauge and Humboldt Stiffness Gauge" (2002). Masters Theses. 4416.