The present booklet gives a report on three research projects into concrete pavements, commissioned by the Federal Ministry of Transport and performed in the last few years at the Testing Bureau for the Construction of Land Traffic Routes. Part I deals with the depressions under a rolling wheel measured at contraction and expansion joints and also at cracks of a 32-year old concrete pavement of a Federal autobahn. The efficiency index derived from the differences in the depressions of the edges of joints provided with dowels was still about 60%, corresponding to 30% load transfer at the joint. In Part II an account is given of laboratory experiments to determine the resistance of individual dowels to the artificial opening of the joint as a function of the diameter of the dowels, the type and thickness of the dowel coating, the temperature, and the velocity and the frequency of the opening. According to these investigations, the dowels should be provided over their whole length with a relatively thick bituminous or suitable plastic coating in order to ensure good behaviour of the joints. Long-term trials with repeated vertical loading and repeated opening and closing of the joints were performed on larger elastically supported test slabs with joints of standard design and joints with other coatings, distances, and diameters of the dowels. The frequency of movement of the joints proved to be decisive for the decrease in efficiency. When the usual distances and diameters of the dowels in the traffic lanes and the use of a suitable dowel coating are maintained, it can even in the case of ineffectiveness of the crack serration be expected that the efficiency index will not fall below 60%. Part III deals with laboratory experiments on large test slabs to determine the influence of sawn or vibrated contraction joints on the moment of cracking. It has been shown that the geometry of the joint insert has only a slight effect on the cracking of joints, while the weakening of the slab cross-section is more significant for the moment of cracking. /Author/

  • Availability:
  • Corporate Authors:

    Bundesminister fuer Verkehr

    ABT. Strassenbau, Lennestrasse 30
    D-5300 Bonn,   Germany 
  • Authors:
    • Deischl, F
  • Publication Date: 1977-4


  • German

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Filing Info

  • Accession Number: 00165501
  • Record Type: Publication
  • Report/Paper Numbers: Report 220
  • Files: TRIS
  • Created Date: Jan 13 1978 12:00AM