EXPERIMENTAL TESTING OF JOINTS IN CONTINUOUSLY REINFORCED CONCRETE SURFACINGS

EXPERIMENTELLE PRUEFUNG AN FUGENKONSTRUKTIONEN DURCHGEHEND BEWEHRTER BETONDECKEN

Concrete surfacings with continuous reinforcement have been constructed in the USA since 1921, and they perform well under traffic loading and the influence of temperature. The advantages of this construction are that for free cracking with a proportion of reinforcement of 0.7 to 0.9% depending on the quality of concrete, the spacing of cracks is short (about 2 M) and the crack openings are small. For a controlled formation of cracking the reinforcement can be reduced from 0.3 to 0.5%, if the bond between the continuous steel and concrete is avoided in the range of the controlled crack (about 70 cm). Commissioned by the Study Group for Application-Technology of Iron and Steel, Duesseldorf, laboratory experiments were carried out with differing lengths of reinforcement. The smallest possible steel cross-section was determined for continuous reinforcement in a 16 cm thick concrete slab (bn 350), which absorbs the temperature stresses in a longitudinal direction and at the same time ensures adequate transmission of transverse forces. The adequacy of the joint construction was investigated specially. The results show a good agreement between theoretical calculations and experiments. Longitudinal reinforcement from smooth round steel bar with 16.5 to 20 cm spacing is adequate (steel requirements 7.6 to 8.6 kg/sq cm = 0.35 - 0.43%). For steel mats with longitudinal bars of 10 mm diameter and 11 - 14 cm spacing, the controlled spacing of cracks can be increased to 4.5 M. This construction is tried at the moment for rail tracks on the fast section Hamm-Bielefeld and for resurfacing work on a deteriorating motorway slab at Sittensen of the motorway Bremen - Hamburg. /TRRL/

  • Availability:
  • Corporate Authors:

    Verlag fuer Publizataet

    Auf der heide 20
    300 Isernhagen HB, Hannover,   Germany 
  • Authors:
    • EISENMANN, J
    • Lempe, U
  • Publication Date: 1975

Language

  • German

Media Info

  • Features: Figures; References;
  • Pagination: p. 23-26
  • Serial:
    • Strassen und Tiefhau
    • Volume: 29
    • Issue Number: 6
    • Publisher: Verlag fuer Publizataet
    • ISSN: 0039-2197

Subject/Index Terms

Filing Info

  • Accession Number: 00183422
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Dec 29 1978 12:00AM