Details of Grant 

EPSRC Reference:	GR/S56818/01
Title:	Development and FE Implementation of a Non-Linear Constitutive Model for Asphalt
Principal Investigator:	Collop, Professor AC
Other Investigators:	Airey, Professor GD
Researcher Co-Investigators:
Project Partners:	Aggregate Industries Delft University of Technology Shell TRL Ltd (Transport Research Laboratory)
Department:	Sch of Civil Engineering
Organisation:	University of Nottingham
Scheme:	Standard Research (Pre-FEC)
Starts:	01 April 2004	Ends:	30 September 2007	Value (£):	417,917
EPSRC Research Topic Classifications:	Pavement Engineering
EPSRC Industrial Sector Classifications:	Construction
Related Grants:	EP/E017797/1
Panel History:	Panel Date Panel Name Outcome 20 Jun 2003 Engineering Prioritisation Panel (B) June 03 Deferred
Summary on Grant Application Form
Premature rutting of asphalt pavements still represents a serious practical problem for heavily trafficked roads, particularly under high temperature conditions. Over the years a number of different approaches have been used for the prediction of permanent deformation in flexible pavement structures. One of the limitations associated with the more sophisticated techniques is that application to practical pavement problems requires implementation of the constitutive model in a Finite Element (FE) framework. This has limited the applicability of these more complex models and todate no accepted methodology is used in the UK. Recent joint research between the Universities of Nottingham and Delft has focussed on the development and FE implementation of a non-linear elasto-visco-plastic constitutive model for asphalt to model quasi-static permanent deformation. The aim of this research is to further develop/validate this model so that permanent deformation in the asphalt layers of a pavement structure under traffic loading can be predicted with reasonable accuracy. The research is broadly divided into experimental work and analytical/numerical work. The experimental work comprises small scale laboratory testing to gather data for the constitutive model and larger scale and full-scale testing for validation/calibration. The analytical/numerical work comprises developments to the constitutive model, implementation into CAPA-3D and development and implementation of a cycle-skipping methodology for simulating permanent deformation due to a large number of cycles.
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Organisation Website:	http://www.nottingham.ac.uk