United States Department of Transportation
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Development of a catalog of resilient modulus values for aggregate base for use with the mechanistic-empirical pavement design guide (MEPDG).
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2015-06-01
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Abstract:Base aggregate is one of the intermediate layers in a pavement system for both flexible and rigid surfaces. Characterization
of base aggregate is necessary for pavement thickness design. Many transportation agencies, including the Virginia Department
of Transportation, assign a layer coefficient for pavement design where consideration for gradation or rock type is not obvious.
The mechanistic-empirical pavement design requires base aggregate to be characterized using a resilient modulus value.
Therefore, 16 aggregates from different geophysical regions of Virginia were collected and tested for resilient modulus in order
to develop a catalog for the implementation of the Mechanistic-Empirical Pavement Design Guide (MEPDG).
A wide range of resilient modulus values for base aggregate was found for different sources with different rock types. A
catalog was developed with resilient modulus values for 16 aggregates from Virginia. The resilient modulus values ranged from
approximately 10,000 to 30,000 psi. In general, limestone showed the higher modulus as compared to granite. An increase in
compaction moisture content, even within allowable limits, adversely affected the resilient modulus value for many aggregates.
This moisture sensitivity is related to both the percent of material passing the No. 200 sieve and the plastic nature of these fines.
These values are recommended to be used as reference values for the MEPDG, but engineering judgment should be applied to
account for moisture sensitivity.
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