SIMULATION STUDY OF FROST EFFECTS ON ROAD STRUCTURES AND THEIR SUBGRADE

ETUDE EN SIMULATION DES EFFETS DU GEL SUR LES STRUCTURES ROUTIERES ET LEURS SOLS SUPPORTS

An observation post for studying the behaviour of various road structures and their frost-susceptible subgrade in the presence of freezing-thawing cycles was built in caen, in order to relate laboratory studies to in-situ observations. Details are diven of the installation and of the results of Details are given of the installation and of the results of installation, conditions of propagation of the freezing front and the movements of the pavement surface caused by frost. From the point of view of performance of the installation, it was possible to lower the temperature of the road surface to -25,5 degrees; when the temperature of the air inside the shed is -10 degrees, the rate of cooling was estimated to be 10 degrees per day. These performances were considered satisfactory. From the point of view of the use of the measurements made: (1) the existence of a linear relation between frost penetration depth and the square root of the frost index was proved beyond doubt, with breaks corresponding to the pavement/subgrade interface showing the great difference between the thermal characteristics of the pavement and of the subgrade. (2) as regards frost propagation in the subgrade, everything occured according to the formula derived by the c.n.r.c. Laboratorie aerothermique, from an initial fictitious even temperature of the mass. (3) there exists a linear relation between the square root of the frost index at the surface of the subgrade and the square root of the frost index at the surface of the pavement. (4) the suction of water due to frost was clearly shown. /TRRL/

  • Authors:
    • Philippe, A
    • Aquirre-Puente, J
    • Bertocille, H
  • Publication Date: 1972-5-11

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00125302
  • Record Type: Publication
  • Source Agency: Laboratoire Central des Ponts et Chausees (LCPC)
  • Files: ITRD, TRIS
  • Created Date: Dec 3 1975 12:00AM