Details:

Alternative Title:
Pavement subgrade resilient modulus design values for Michigan's seasonal changes
Creators:
Baladi, Gilbert ; Dawson, Tyler ; Sessions, Colin
Baladi, Gilbert ; Dawson, Tyler ; Sessions, Colin Less -
Corporate Creators:
Michigan State University. Department of Civil and Environmental Engineering
Subject/TRT Terms:
[+]
Modulus Of Resilience Pavement Design Pavements--Michigan--Design And Construction Pavements--Michigan--Subgrades--Testing Soils--Michigan--Testing Soil Tests Subgrade Materials
Publication/ Report Number:
RC-1531
Resource Type:
Tech Report
Geographical Coverage:
Michigan
Edition:
Final report.
Corporate Publisher:
Michigan. Dept. of Transportation. Construction and Technology Division
Abstract:
The resilient modulus (MR) of roadbed soil plays an integral role in the design of pavement systems. Currently, the

various regions of the Michigan Department of Transportation (MDOT) use different procedures to determine the

MR values. Most of these procedures are applicable to the new Mechanistic-Empirical Pavement Design Guide (ME

PDG) level 3 design only and the 1993 AASHTO design guide. Therefore, a consistent, uniform, and

implementable procedure that meets the requirements of the M-E PDG for level 1, 2, and 3 designs and the 1993

AASHTO Design Guide was developed.

In this study, the State of Michigan was divided into fifteen clusters where the physical and engineering

characteristics of the soils were similar. The clusters were then divided into ninety nine areas to narrow down the

ranges of the engineering and physical characteristics of the soils. Disturbed roadbed soil samples were collected

from seventy five areas, and twelve undisturbed soil samples (Shelby tubes) were collected from areas with CL and

SC roadbed soils. The soil samples were subjected to simple tests (moisture content, grain size distribution, and

Atterberg limits when applicable), and cyclic load triaxial tests to determine the soils resilient modulus values.

Predictive correlation equations were developed to estimate the MR values of the roadbed soil based on the results

of the simple tests.

Deflection data from Falling Weight Deflectometer (FWD) tests conducted throughout the state were obtained from

MDOT. The deflection database consisted of hundreds of previous FWD tests that were conducted on various

projects over the last 20+ years and eighty FWD tests conducted as part of this study. All FWD data files with

sufficient data were analyzed to backcalculate the roadbed soil MR values. Comparison between the laboratory and

the backcalculated MR values indicated that the two values are almost equal when the stress boundaries used in the

laboratory tests matched those of the FWD tests.

The report includes the recommended MR design values are provided on state map and in table format.


Format:
PDF
Funding:
2002-0532
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:42cb5d7af5246d8535eee314a7be925acd3f1a6d93862b9ba51ed9f01ed088e9
Download URL:
https://rosap.ntl.bts.gov/view/dot/18186/dot_18186_DS1.pdf
File Type:

Supporting Files

• No Additional Files

More +