OLD AND NEW CONCRETE ACTING TOGETHER AT BRIDGE REPAIRS

SAMVERKAN MELLAN GAMMAL OCH NY BETONG VID BROREPARATIONER

If the water-jet technique is used to remove the deteriorated top layer of a concrete bridge deck the deteriorated concrete can be replaced by a new concrete topping without providing the surface with stud bolts which traditionally have been used to ensure the shear capacity. The water-jet technique makes it possible to remove concrete selectively and to create a clean and rough surface without inducing any microcracks into the remaining concrete. A good bond between existing and new concrete also demands a careful compacting of the new concrete. Composite concrete slabs fulfilling these demands have developed ultimate loads comparable to those developed by slabs of similar thickness cast in one lift. For the replacement of deteriorated concrete on vertical and overhead surfaces shotcrete is more convenient than convential concrete casting with appurtenant complicated formwork. According to tests on composite beams shotcrete seems to be a good repair method if removing, cleaning and shotcreting operations all are carried out carefully. Furthermore, the interface between old and new concrete ought not to coincide with the reinforcement plane. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0029130700291307
• Corporate Authors:

  Nordiska Betongfoerbundet

  10044 Stockholm,   Sweden 
• Authors:
  • Silfwerbrand, J
• Publication Date: 1988

Language

• Swedish

Media Info

• Features: References;
• Pagination: p. 3-7
• Serial:
  • Nordisk Betong
  • Publisher: Nordiska Betongfoerbundet
  • ISSN: 002913070029-1307

Subject/Index Terms

• TRT Terms: Adhesion; Beams; Bridge decks; Composite materials; Concrete; Cracking; Creep; Deterioration; Hydraulic jetting; Methodology; Repairing; Shotcrete; Shrinkage; Slabs
• ITRD Terms: 5942: Adhesion; 3472: Beam; 3482: Bridge deck; 9005: Composite; 4755: Concrete; 5211: Cracking; 4732: Creep (mater); 5255: Deterioration; 3643: Hydraulic jetting; 9102: Method; 3635: Repair; 4730: Shotcrete; 4743: Shrinkage; 3491: Slab
• Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation; Materials;

Filing Info

• Accession Number: 00493421
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Report/Paper Numbers: 1988:5
• Files: ITRD, TRIS
• Created Date: Apr 30 1990 12:00AM