000004923 001__ 4923 000004923 005__ 20141119144605.0 000004923 04107 $$aeng 000004923 046__ $$k2002-06-02 000004923 100__ $$aSchwartz, Charles W. 000004923 24500 $$aVISCOPLASTICITY MODELING OF ASPHALT CONCRETE BEHAVIOR 000004923 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference 000004923 260__ $$bColumbia University in the City of New York 000004923 506__ $$arestricted 000004923 520__ $$2eng$$aA constitutive model based on an extended form of the Schapery continuum damage formulation (Ha and Schapery, 1998; Schapery, 1999) is currently being evaluated and developed as a comprehensive material model for asphalt concrete. This model considers the viscoelastic, damage, and viscoplastic components of asphalt concrete behavior over the full range conditions of interest for the mechanistic prediction of flexible pavement distresses. The focus of the present paper is limited to the viscoplastic response component at intermediate and high temperatures. The results confirm earlier findings (Schwartz et al., 2002) that asphalt concrete in compression is a thermorheologically simple material well into the large strain viscoplastic regime at elevated temperature. The study demonstrates that the proposed viscoplastic model component provides a good representation of the viscoplastic response of asphalt concrete in uniaxial unconfined compression. Given the validity of time-temperature superposition for viscoplastic response, the viscoplastic material parameters can be calibrated from a limited number of uniform time and uniform load creep and recovery tests. Typical viscoplastic material parameters are derived for a representative asphalt concrete mixture. 000004923 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb. 000004923 653__ $$aAsphalt concrete, viscoplasticity, time-temperature superposition, damage 000004923 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002 000004923 720__ $$aSchwartz, Charles W.$$iGibson, Nelson H.$$iSchapery, Richard A.$$iWitczak, Matthew W. 000004923 8560_ $$ffischerc@itam.cas.cz 000004923 8564_ $$s811192$$uhttp://invenio.itam.cas.cz/record/4923/files/544.pdf$$yOriginal version of the author's contribution as presented on CD, . 000004923 962__ $$r4594 000004923 980__ $$aPAPER