Field evaluation of corrosion inhibitors for concrete. Interim report 1, Evaluation of exposure slabs repaired with corrosion inhibitors.

Details

• Alternative Title:
  Evaluation of exposure slabs repaired with corrosion inhibitors
• Creators:
  Sprinkel, Michael M ; Ozyildirim, H. Celik
• Corporate Creators:
  Virginia. Dept. of Transportation ; Virginia Transportation Research Council (VTRC)
• Subject/TRT Terms:
  Bridge Decks Corrosion Protection Epoxy Coatings--Evaluation Pore Water Reinforced Concrete--Testing Reinforcing Bars--Testing
• Publication/ Report Number:
  VTRC 99-IR1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Virginia
• Edition:
  Interim report.
• Corporate Publisher:
  Virginia Transportation Research Council (VTRC)
• Abstract:
  One hundred and fifty-six exposure slabs have been constructed with and without a variety of combinations of corrosion inhibiting admixtures and topically applied inhibitors. To accelerate corrosion one hundred and thirty-six of the slabs were constructed with concrete that surrounded the top mat of reinforcement with chloride contents of 3,6, 10, and 15 Ib/yd³ (1.8,3.5,5.9, and 8.9 kg/m³). This paper presents the results from measurements made on the slabs in May 1998 after approximately 1 year of exposure. The measurements show that as the chloride ion content in the slabs increases, the macrocell current, macrocell potential, half-cell potential, and rate of corrosion increase and the resistance decreases. Macrocell currents exceed 10 uA, indicating corrosion activity, in slabs cast with chloride in the concrete except those with 3 Ib/yd³ (1.8 kg/m³ ) of chloride that were overlayed and patched or patched. Measurements taken to determine the rate of corrosion indicate high, moderate, low, and passive states of corrosion in 63,22, 12, and 3 percent, respectively, of the slabs. The measurements also show no significant difference between the slabs repaired with and without corrosion inhibitor admixtures and topical treatments. Slabs repaired with 7% silica fume showed half-cell potentials that were less negative than those repaired without silica fume.
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:d05a74333c502c0b72bc8c8f44b908db347f192fce9c05bdd24f40ab04155c59
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/19494/dot_19494_DS1.pdf
• File Type:
  [PDF - 2.70 MB ]