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Communication Dans Un Congrès Année : 2008

Assessment of french design method for flexible pavement by mean of the LCPC's ALT facility

Résumé

One of the three rings of the LCPC's ALT facility has been equipped in 2002 with a 3 meters high waterproof concrete pit and a pumping station, making possible to completely control the water table level in the soil supporting the experimental pavement. The pit has been filled by clayey-silty sand, which the modulus varies from 110 to 85 MPa according to the water content. This soil has been chosen for its water-content susceptibility, but also for its permeability properties, making possible to rise the water-table from the buttom of the pit to the top and saturate the soil within a time of about one week. The first experiment using this new installation has concerned the design of flexible pavements. The objective was to improve the taking into account of the hydraulic condition of the subgrade in flexible pavements design. Four different flexible pavements and one bituminous reference structure have been tested. The different structures were designed for a service life varying from 0.25 to 1.5 millions of 130 kN French standard loads. During the first stage, the water-table level in soil was maintained at its lowest level (-2.80m) and the mean radius of rotation of the load was fixed at 19 meters. During the second stage, the water-table level was maintained at its upper level (-0.70 meter) and the radius of rotation of the load was 16 meters. In total 1.5 million of 65 kN dual-wheel loading were applied during each stage. The different structures supported this traffic without suffering any particular major failure, except for the thinnest one which had to be reinforced after 250 000 passes during the second phase. The experiment led to globally confirm the current French rational design method for flexible pavement. However, it was also observed that the design model doesn't completely take into account the damaging factors ; mainly the rutting of unbound granular aggregates. It is ignored by the design model, but it significantly contributes to the total permanent deformation of the structure.
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Dates et versions

hal-00399878 , version 1 (29-06-2009)

Identifiants

  • HAL Id : hal-00399878 , version 1

Citer

Jean Maurice Balay, Jean Pierre Kerzreho. Assessment of french design method for flexible pavement by mean of the LCPC's ALT facility. 3rd International Conference APT'08, Oct 2008, France. 13p. ⟨hal-00399878⟩
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