PREDICTION OF CHLORIDE PENETRATION IN CONCRETE

The objective of this study was to identify or develop a test for predicting chloride penetration in concrete, to be used for evaluating new mixes, for accepting or rejecting new concrete according to specifications, and for evaluating in-place concrete. The test was intended to supplement or replace the use of AASHTO T27-93 "Electrical Indication of Concrete's Ability to Resist Chloride." In this study, different test procedures were evaluated for use in predicting the chloride penetration resistance of concrete in a short time frame (less than 35 days). The test results were correlated to those of long-term salt ponding and diffusion tests. In the first phase, a number of tests identified in the literature were subjected to a preliminary screening process. In the second phase, tests identified as more promising were subjected to a more rigorous evaluation. In the third phase, the best test procedure was further examined. As a result of this work, the Rapid Migration Test (RMT) was identified as the most successful. The RMT involves using an electrical potential to drive chloride ions into a concrete sample for a specific test duration and then evaluating the depth of chloride penetration with a colorimetric indicator. The RMT correlates as well or better than AASHTO T277 with the long term ponding tests and was able to evaluate correctly a wider variety of concretes, including those with corrosion inhibitors. The quantitative parameter obtained in the RMT was related to those from AASHTO T277 in the high performance concrete (HPC) grades identified by Goodspeed, Vanikar, and Cook (1996). As part of the work described above, an interlaboratory evaluation was performed to assess the RMT and to refine the procedure.

• Record URL:
  https://rosap.ntl.bts.gov/view/dot/50237
• Corporate Authors:

  University of Toronto

  Department of Civil Engineering, 35 St George Street
  Toronto, Ontario  Canada  M5S 1A4

  Federal Highway Administration

  Turner-Fairbank Highway Research Center, 6300 Georgetown Pike
  McLean, VA  United States  22101
• Authors:
  • Hooton, R D
  • Thomas, MDA
  • Stanish, K
• Publication Date: 2001-10

Language

• English

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; References; Tables;
• Pagination: 429 p.

Subject/Index Terms

• TRT Terms: Chlorides; Concrete; Correlation analysis; High performance concrete; Laboratory tests; Penetration resistance; Quality control; Test procedures
• Identifier Terms: AASHTO T 277; AASHTO T27-93
• Uncontrolled Terms: Ponding tests; Rapid migration test
• Subject Areas: Data and Information Technology; Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00816525
• Record Type: Publication
• Report/Paper Numbers: FHWA-RD-00-142,, Final Report
• Contract Numbers: DTFH61-97-R-00022
• Files: NTL, TRIS, ATRI, USDOT
• Created Date: Sep 26 2001 12:00AM