REPAIR OF CRACKED CONCRETE STRUCTURES BY MEANS OF EPOXY BINDER INJECTION

REPARATION DES STRUCTURES EN BETON FISSUREES PAR INJECTION DE LIANTS EPOXYDIQUES

Part 1 of the report recalls data on organic binders, mainly epoxy binders. Criteria are given for the selection of products before use. Part 2 is a study of the effectiveness of the repair as regards the thermodynamics of the interface - the adhesion of the binder to the support is ensured by the wetting of the concrete surface by the different binder components, then by the binder itself. An additional study of capillary phenomena shows that the binder advances in the cracks mainly thanks to hydrostatic pressure. The previous results are compared to those of a mechanical study on a reinforced concrete model: a cracked beam in circular bending is treated under load (open cracks) by injection and subjected to a second flexural test. It appears that the behaviour of the repaired beam is improved under small loads, but that with greater loads the value of the modulus of elastic is too low and injection defects appear. Lastly the old cracks reappear completely when the elastic modulus of the reticulated binder is too low. In the case of incomplete repair it is at the location of badly filled or unfilled cracks that cracking reappears. When injection is carried out satisfactorily and if the elastic modulus of the reticulated binder is sufficiently high the mechanical behaviour under flexural stress is very near that of the initial beam before cracking. (TRRL)

  • Availability:
  • Corporate Authors:

    Central Laboratory of Bridges & Highways, France

    75732 Paris,   France 
  • Authors:
    • Mouton, Y
  • Publication Date: 1979-6

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00324380
  • Record Type: Publication
  • Source Agency: Laboratoire Central des Ponts et Chausees (LCPC)
  • Report/Paper Numbers: Res Rpt LPC N86 Monograph
  • Files: ITRD, TRIS
  • Created Date: Oct 28 1981 12:00AM