NEW PROCESS FOR REINJECTING PRESTRESSING CABLE DUCTS

EXPERIMENTATION D'UN NOUVEAU PROCEDE DE REINJECTION DES GAINES DE CABLES DE PRECONTRAINTE

For the last few years, the monitoring and surveillance methods for engineering structures have become more sophisticated. Among the defects detected, insufficient grouting is one of the more often brought to light. Because of its high sensitivity to corrosion, prestressed steel reinforcement requires efficient protection. Grouting also ensures the mechanical bond between the reinforcement and the concrete. A suspected grouting defect is often shown by a crack with efflorescence following the cable or by traces of rust. Gamma rays show insufficient grouting with great accuracy. It is possible to control the results obtained with gamma rays by using an endoscope. When insufficient grouting is shown to exist, reinjection should be envisaged. This is a difficult and costly process. The conventional method consists in accurately positioning on the defective duct a nozzle and a vent. The vacuum reinjection process facilitates the examination of the cable conditions through one hole with the endoscope, the determination of the volume of the cavity detected, and the injection of the quantity of grout necessary to fill that cavity. /TRRL/

• Corporate Authors:

  Laboratoire Central des Ponts et Chausees (LCPC)

  Boulevard Lefebvre 58
  Paris Cedex 15,   France  F-75732

  Bulletin de Liaison des Lab des Ponts et Chaussees

  58 Boulevard Lefebvre
  75732 Paris,   France 
• Authors:
  • Berissi, R
  • Lazzeri, L
• Publication Date: 1976-3-4

Language

• French

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 41-46
• Serial:
  • Bulletin de Liaison des Lab des Ponts et Chaussees
  • Issue Number: 82
  • Publisher: Laboratoire Central des Ponts et Chausees (LCPC)

Subject/Index Terms

• TRT Terms: Cables; Defects; Ducts; Gamma rays; Grouting; Methodology; Prestressed concrete; Prestressing; Reinforced concrete; Reinforcing steel; Surveillance; Vacuum
• Uncontrolled Terms: Injection (Materials)
• ITRD Terms: 4530: Cable; 5238: Defect (tech); 6706: Gamma ray; 3617: Injection (mater); 9102: Method; 4796: Prestressed concrete; 4777: Prestressing; 9101: Surveillance
• Subject Areas: Construction; Highways; Materials; Planning and Forecasting; I32: Concrete; I34: Steels and Metals; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00152544
• Record Type: Publication
• Source Agency: Central Laboratory of Bridges & Highways, France
• Report/Paper Numbers: ANALYTIC
• Files: ITRD, TRIS
• Created Date: Jul 2 1977 12:00AM