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A simplified computer model for grid reinforced asphalt overlays



Title: A simplified computer model for grid reinforced asphalt overlays
Author(s): N.H. Thom
Paper category : conference
Book title: Fourth International RILEM Conference on Reflective Cracking in Pavements - Research in Practice
Editor(s): A. O. Abd El Halim, D. A. Taylor
and El H. H. Mohamed
Print-ISBN: 2-912143-14-4
e-ISBN: 2351580265
Publisher: RILEM Publications SARL
Publication year: 2000
Pages: 37 - 46
Total Pages: 10
Nb references: 7
Language: English


Abstract: 
Modelling and prediction of reflective cracking has proved to be one of the hardest tasks in pavement design. The number of possible variables is large and, if any geosynthetic is included, a very complex problem arises. This can be tackled in a number of ways and this paper describes a technique which, though it contains simplifying assumptions, still maintains a fundamental approach. The asphalt surfacing is modelled as a single linear elastic material, with a fatigue cracking characteristic related to strain in the material. The option of grid reinforcement is given and/or an interface within the asphalt layer with reduced shear stiffness. The supporting structure is assumed to consist of a cracked layer, resting on a foundation which is described by a modulus of subgrade reaction. Details of loading, asphalt overlay, grid reinforcement, interface condition, crack spacing and interlock, and the foundation are input by the user. The program then predicts crack growth, both top-down and bottom-up, using an incremental approach. The paper presents predictions for two differing pavement design conditions. The program is found to have potential use, both in pavement design and in grid reinforcement design.


Online publication: 2009-12-23
Publication type : full_text
Public price (Euros): 0.00