North Central Pavement Research and
Implementation Coordination Partnership

Workshops

The first workshop of the pooled fund took place in Lansing, Michigan in October 2007. Pooled fund representatives gathered to discuss methods for testing resilient modulus of soils in the laboratory and applying those results in the field. The group plans to hold a technology transfer workshop every year to facilitate technical information sharing between participating agencies on selected topics.

Laboratory Resilient Modulus Test Methods for Subgrade Materials
October 17, 2007

Agenda
Final Report

Presentations (PDF files)

Debakanta Mishra – University of Ilinois, Urbana-Champaign (4.2 MB)
Reviewed uses of resilient modulus in design, protocols for testing, and method used at the University of Illinois Advanced Transportation Research and Engineering Laboratory.

Gilbert Baladi – University of Minnesota (5.3 MB)
Reviewed uses for resilient modulus testing of soils in the MEPDG. Discussed AASHTO standards and shortcomings.

Ralph Hodek – Michigan Technological University (3.2 MB)
Presented the method he used in research for MDOT, as well as further research needs.

Shongtao Dai – Minnesota Department of Transportation (3.5 MB)
Presented the Mn/DOT procedure, which is based on NCHRP Project 1-28A.

Joe Labuz – University of Minnesota (3.9 MB)
Discussed various technical issues with the testing protocol, equipment, calculations and interpretations of lab testing procedures.

John Siekmeier – Minnesota Department of Transportation (12.3 MB)
Presented preliminary findings of an NCHRP synthesis report on state methods for lab testing the resilient modulus of soils.

Lev Khazanovich – University of Minnesota (661 KB)
Reviewed the use of resilient modulus with the new mechanistic-empirical design guide. Described the various input levels that can be used in MEPDG and the effectiveness of different protocols at different input levels.

Hani Titi – University of Wisconsin-Milwaukee (517 KB)
Presented the method he employed in his research for the Wisconsin Highway Research Program and WisDOT. Reviewed procedures adopted from NCHRP Project 1-28A.

Supplemental Documents (PDF files)

European standard: Unbound and hydraulically bound mixtures - Test methods -
Part 7: Cyclic load triaxial test for unbound mixtures (232 KB)
European Committee for Standardization

NCHRP Research Results Digest: Laboratory Determination of Resilient Modulus
for Flexible Pavement Design (4.5 MB)
University of Maryland

Research report: Testing of Unbound Aggregates and Subgrade Soils at the
University of Illinois (476 KB)
Erol Tutumluer, University of Illinois at Urbana-Champaign

Research report: Small Strain and Resilient Modulus Testing of Granular
Soils (2.1 MB)
Peter Davich, Joseph Labuz, Bojan Guzina & Andrew Drescher, University of
Minnesota

Research proposal: Pavement Subgrade MR Design Values for Michigan's
Seasonal Change (532 KB)
Gilbert Baladi, Michigan State University

Research proposal: Determination of Resilient Modulus Values for Typical
Plastic Soils of Wisconsin (324 KB)
Hani Titi, University of Wisconsin - Milwaukee

Research proposal: Resilient Modulus at the Limits of Gradation and Varying
Degress of Saturation (284 KB)
Ralph Hodek and Torsten Mayrberger, Michigan Technological University

TRB paper: Characterization of MnROAD In-situ Subgrade Soil through Triaxial
Experiments (116 KB)
Shongtao Dai and John Zollars, Minnesota Department of Transportation

TRB paper: Resilient Modulus of Base Course Containing Recycled Asphalt
Pavement (332 KB)
Woosung Kim, Joseph Labuz and Shongtao Dai, Minnesota Department of
Transportation