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2016-09-27

Congrès INFRA 2016

21 au 23 novembre 

Biographie

David Hein est un ingénieur principal et vice-président des Transports de l'Applied Research Associates, Inc à Toronto, Canada. M. Hein possède une vaste expérience de la conception, l'évaluation et la gestion des trottoirs allant de routes à faible volume aux principales autoroutes et aéroports. Il est membre du comité de l'American Society of Civil Engineers Codes and Normes (ASCE) et président du comité de l'ASCE qui a développé une norme pour la conception de pavés perméables autobloquants en béton (ICPs) pour les routes municipales. Il est également le président du comité de l'ASCE qui développe une norme pour le pavés perméables autobloquants en béton. Il est le président sortant du comité du Transportation Association of Canada Pavements Standings et ancien président du comité du World Road Association Pavements.

Résumé

This paper outlines technical advances in permeable interlocking concrete pavement (PICP) design being introduced in the newly created American Society of Civil Engineers (ASCE) standard.  PICPs include high strength, impermeable concrete units for the surface that meet ASTM or CSA standards. When installed, the joints between units are filled with permeable aggregate to allow for surface water infiltration. The units are placed over an open-graded aggregate bedding course, aggregate base and subbase for water storage and structural support.

The design of permeable pavements differ from other traditional pavement systems in that both structural and hydrologic considerations impact the system depth, one of three different infiltration approaches can be used based on site and subgrade conditions, and unique elements are included over sloped subgrades. 

New to the ASCE standard is structural design for supporting traffic through the use of a mechanistic-empirical model that was developed through full-scale accelerated testing research completed at the University of California Davis Pavement Research Center.  The impact of pavement loading is modelled using the pavement layer and subgrade stiffness under dry and wet conditions to determine when a user specified rut depth results from traffic loading.  

The paper discusses the dichotomy between not compacting the soil subgrade for infiltration, and compacting for enhanced structural support in saturated conditions.  Guide construction specifications, construction and maintenance guidelines are provided via checklists. A key tool for assessing surface infiltration and subsequent vacuum cleaning is adoption of an ASTM surface infiltration test for PICP.

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