Assessment of analytical tools used to estimate the stiffness of asphalt concrete

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DOIResolve DOI: http://doi.org/10.1139/L07-084
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TypeArticle
Journal titleCanadian Journal of Civil Engineering
Volume35
IssueMarch 3
Pages268275; # of pages: 8
Subjectasphalt concrete, dynamic modulus, predictive model, material library; Roads/Pavement
AbstractThis paper presents the results of an assessment performed on the empirical model used in level 3 input of the proposed mechanistic?empirical pavement design guide (MEPDG) developed under the National Cooperative Highway Research Program (NCHRP) project 1-37A. The empirical formula estimates the stiffness (dynamic modulus) of asphalt concrete mixes used in paving roads. The assessment revealed that analytically estimated dynamic modulus differs substantially from the actual value determined in the laboratory. Errors are high at elevated service temperatures and for mixes prepared with engineered binders. An alternative approach is presented in this paper based on the use of generic modulus values. Generic asphalt concrete dynamic modulus values were generated from tests performed on typical Marshall and SuperPave mixes. Results were compiled in a database (material library) to provide users of the MEPDG with estimates of the dynamic modulus that will yield more accurate predictions of performance until dynamic modulus laboratory testing capabilities are established locally.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number50050
18818
NPARC number20377454
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Record identifier138aa5ea-2368-4146-b1cb-3665b2c3104c
Record created2012-07-24
Record modified2016-05-09
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