EPOXY GLUE JOINTS IN PRECAST CONCRETE SEGMENTAL BRIDGE CONSTRUCTION

Tests are described on the use of epoxy glue in precast concrete glued segmental bridge construction. The object was to investigate the structural properties of glued joints and to examine the curing characteristics of the glue under normal site conditions, particularly during cold weather. The structural properties were examined using beams made up of five 150 mm concrete cubes glued together and tested in bending for rupture, deflexion and long term creep. Curing characteristics were examined in conjunction with the field application of the glue by testing tell-tale metal strips bonded with glue sampled from joints and cured alongside the bridge. Additional bonded strips were cured under more controlled conditions. Thermocouples were placed in some joints of the bridge to check on the effectiveness of space heating provided to assist curing in severe winter conditions. The results show that precast segments jointed with epoxy glue are structurally as effective as monolithic concrete provided that the proper precautions are taken in preparing the mating surfaces and that the glue achieves full cure. Curing at low temperatures may be prolonged indefinitely and this should be considered in design, preferably in order to allow construction to proceed as far as possible in cold conditions without the need for fully cured glue. Space heating can be useful in assisting the curing. Simple tell-tale specimens can provide a ready means for on-site checking for cure where this may be critical to the construction stage. There is some evidence that creep may be greater in glued members but its influence depends on scale. Within structures the size of segmental bridges, this increased creep effect is considered to be negligible. (Author/TRRL)

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 163-177
  • Serial:
    • Volume: 70

Subject/Index Terms

Filing Info

  • Accession Number: 00334124
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1981 12:00AM