EFFECTS OF LATEX ADDITIONS ON CENTRIFUGALLY CAST CONCRETE FOR INTERNAL PIPELINE PROTECTION

Centrifugally-cast concrete liners applied to the interiors of plain steel pipe sections were tested for corrosion performance in brine solutions. An American Petroleum Institute (API) standard concrete, with and without additions of a styrene-butadiene copolymer latex, was subjected to simulated service and laboratory tests. Simulated service tests used a mechanically pumped test manifold containing sections of concrete-lined pipe. Linear polarization probes embedded at steel-concrete interfaces tracked corrosion rates on these samples as a function of exposure time. Laboratory tests used electro-chemical impedance spectroscopy to study corrosion occurring at the steel-concrete interfaces. Electron probe microanalysis (EPMA) determined ingress and distribution of damaging species, such as Cl, in concrete liners periodically returned from the field. Observations of concrete-liner fabrication indicate that latex loading levels were difficult to control in the centrifugal-casting process. Overall, test results indicate that latex additions do not impart significant improvements to the performance of centrifugally cast liners and may even be detrimental. Corrosion at steel-concrete interfaces appears to be localized and the area fraction of corroding interfaces can be greater in latex-modified concretes than in API baseline material. EPMA shows higher interfacial Cl concentration in the latex-modified concretes than in the API standard due to rapid brine transport through cracks to the steel surface.

• Supplemental Notes:
  • International corrosion congress (12th), Houston, TX, 19-24 Sep 1993. Sponsored by Department of Energy, Washington, DC.
• Corporate Authors:

  Sandia National Laboratories

  P.O. Box 5800
  Albuquerque, NM  United States  87185
• Authors:
  • BUCHHEIT, R G
  • Hinnkebein, T E
  • Hlava, P F
  • Melton, D G
• Publication Date: 1993

Language

• English

Media Info

• Pagination: 12 p.

Subject/Index Terms

• TRT Terms: Brines; Centrifugal force; Corrosion protection; Latex modified concrete; Linings; Material reinforcement; Pipelines; Preservation; Reinforced concrete
• Old TRIS Terms: Pipeline protection
• Subject Areas: Maintenance and Preservation; Pipelines; Terminals and Facilities;

Filing Info

• Accession Number: 00666331
• Record Type: Publication
• Report/Paper Numbers: SAND-93-0706C, CONF-9309150-5
• Files: TRIS
• Created Date: Sep 9 1994 12:00AM