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Importing Wikidata short description: "Asphalt roads designing method" |
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{{Short description|Asphalt roads designing method}}
The '''Shell pavement design method''' was used in many [[countries]] for the design of new [[Sidewalk|pavements]] made of [[asphalt concrete|asphalt]].<ref>[https://trid.trb.org/view/60936 Asphalt pavement Design - The Shell Method] </ref> First published in 1963,<ref>{{Cite book|title=Bituminous Mixtures in Road Construction|date=1994|editor-first=Robert N.|editor-last=Hunter|publisher=Thomas Telford|isbn=9-78-0-7277-1683-5|page=80|url=https://books.google.com/books?id=G33BAZUTX9oC}}</ref> it was the first mechanistic design method, providing a procedure that was no longer based on codification of historic experience but instead that permitted computation of strain levels at key positions in the pavement. By analyzing different proposed constructions (layer materials and thicknesses), the procedure allowed a designer to keep the tensile strain at the bottom of the asphalt at a level less than a critical value and to keep the vertical strain at the top of the subgrade less than another critical value. With these two strains kept, respectively, within the design limits, premature fatigue failure in the asphalt and rutting of the pavement would be precluded. Relationships linking strain values to fatigue and rutting permitted a user to design a pavement able to carry almost any desired number of transits of standard wheel loads.
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