Laboratory R-value vs. in-situ NDT methods.

Lenke, Lary R.; Kias, Evan M. C.; Jenkins, Richard; Grgich, Christopher; University of New Mexico, Albuquerque. Department of Civil Engineering

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ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.

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Laboratory R-value vs. in-situ NDT methods.

2006-05-01
By Lenke, Lary R. ; Kias, Evan M. C. ; Jenkins, Richard ; ...

English

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Details:

Creators:

Lenke, Lary R. ; Kias, Evan M. C. ; Jenkins, Richard ; Grgich, Christopher

Lenke, Lary R. ; Kias, Evan M. C. ; Jenkins, Richard ; Grgich, Christopher Less -
Corporate Creators:

University of New Mexico, Albuquerque. Department of Civil Engineering
Corporate Contributors:

New Mexico. Dept. of Transportation. Research Bureau
Subject/TRT Terms:

[+]

Base Course (Pavements) Clegg Impact Hammer Cone Penetrometers Field Tests GeoGauge Nondestructive Tests R-Values (Subgrades) Soil Penetration Test Soil Stiffness Soil Tests Subgrade (Pavements)
Publication/ Report Number:

NM04MSC-02
Resource Type:

Tech Report
Geographical Coverage:

New Mexico
Corporate Publisher:

New Mexico. Dept. of Transportation. Research Bureau
Abstract:

The New Mexico Department of Transportation (NMDOT) uses the Resistance R-Value as a quantifying parameter in subgrade and base course design. The parameter represents soil strength and stiffness and ranges from 1 to 80, 80 being typical of the highest strength for typical granular materials (theoretically R can vary between 0 and 100). Currently, a field empirical method allows estimation of this value by first determining the AASHTO Soil Classification and the Plasticity Index (PI), and then referencing the R-Value from a standard estimated table of values. This methodology often leads to overestimated R-Values and can be costly. Soil stiffness is a parameter more closely related to the R-Value than the PI and AASHTO classification of a soil. Therefore, it can be used to obtain a more accurate estimate of the R-Value. Three devices, the Clegg Impact Hammer, GeoGauge™, and a Dynamic Cone Penetrometer are possible candidates for obtaining such an in-situ soil stiffness. By obtaining mathematical relationships between the stiffness values by using the above-mentioned devices and laboratory determined R-Values, a suitable replacement for the current R-Value estimation method may be chosen.
Format:

PDF
Funding:

C04654
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:3602d80eb47eb4874fe27d6729159b992e86f40079ea6c7e6e9c6d2a22d385d0
Download URL:

https://rosap.ntl.bts.gov/view/dot/17837/dot_17837_DS1.pdf
File Type:

[PDF-338.07 KB]