The results of research published in 1970 on the formation of voids below the concrete surfacings of motorways are subjected to a detailed critical analysis. It was established that the voids formed below the edges of the slabs, but not below the centres of the slabs. From an analysis of the plate bearing test an explanation is given of why concrete surfacings on a base slit and clay topped by 20 cm of sand have proved good in practice. On this base an E (index V2) = 200 KP/SQ. CM was determined with the 30 CM diameter loading plate. The concrete slab must have a base which is and remains uniform. Stabilization with tar or cement has been proven in this respect. On the other hand the subsoil does not need to have any great bearing capacity. Even on very soft subsoil such as peat and organic silt the so-called sandwich method can be used, where the concrete pavement lies directly on the soft soil layer. The uniform deformation properties of the base below the surfacing are most important in practice. On the other hand the specification of minimum quantity for the deformation modulus is unnecessary. /TRRL/

  • Corporate Authors:


    Moelkerbastei 5
    A-1010 Vienna,   Austria 
  • Authors:
    • Siedek, P
  • Publication Date: 1972-6


  • German

Media Info

  • Features: Figures; References;
  • Pagination: p. 173-180
  • Serial:
    • Journal of Materials
    • Volume: 15
    • Issue Number: 6
    • Publisher: American Society for Testing and Materials

Subject/Index Terms

Filing Info

  • Accession Number: 00081357
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: May 1 1975 12:00AM