Evaluation of resistivity meters for concrete quality assurance.

Details

• Creators:
  Kevern, John T. ; Halmen, Ceki ; Hudson, Dirk
• Corporate Creators:
  University of Missouri--Kansas City
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Concrete
  • Admixtures
  • Electrical resistivity
  • Permeability
  • Quality assurance
  • Durability
  • Field tests
  • Laboratory tests
  • Evaluation
• Publication/ Report Number:
  cmr 16-001 ; TR201414
• Resource Type:
  Tech Report
• Geographical Coverage:
  Missouri
• Corporate Publisher:
  Missouri. Dept. of Transportation
• Abstract:
  This research evaluated a series of MoDOT concrete mixtures to verify existing relationships between surface resistivity (SR), rapid ; chloride permeability (RCP), chloride ion diffusion, and the AASHTO penetrability classes. The research also performed a precision ; and bias evaluation to provide acceptable limits should SR be implemented for quality assurance and to refine language in the AASHTO ; test standard. In the precision and bias determination concrete was produced from three field sites and tested at both UMKC and ; MoDOT labs. Field mixtures included a paving mixture, a bridge deck mixture, and a structural mixture. Eleven other mix designs were ; produced in the lab and evaluated for RCP correlation and included paving, bridge deck, structural, and repair mixtures per Missouri ; Department of Transportation requirements. Additional testing included surface resistivity testing on sealed samples and an existing ; bridge deck. Results showed excellent correlation between SR and RCP which matched existing relationships provided by AASHTO ; and other state DOTs. The structural mixture containing 50% Class F fly ash had the best performance with “very low” chloride ion ; penetrability at 90 days. A ternary paving mixture with 20% Class C fly ash and 30% slag replacement for cement also demonstrated ; low permeability as well as high compressive strength with an average value of over 9,000 psi at 90 days. The two repair mixtures ; showed moderate to low penetrability readings and high early strength consistent with their desired purpose. Tests were also performed ; on a series of slab samples to evaluate SR as a tool for evaluating sealer application. The presence of silane and lithium silicate were ; able to be detected by the SR test. As value added to the laboratory research, field testing was attempted on a bridge deck with the goal ; of providing non-destructive insight to the steel condition in the field. Due to the condition of the bridge conclusions could not be drawn ; other than making recommendations for future bridge deck evaluations. The extensive amount of surface resistivity testing (>4500 tests) ; on 14 concrete mixtures at ages from 3 hours to 90 days using multiple labs, equipment, operators, and curing conditions has verified ; RCP relationships and allowed refinement of a testing procedure for a MoDOT standard in the Engineering Policy Guide. Surface ; resistivity presents an opportunity to improve MoDOT concrete mixtures and specifications to increase durability without adding ; significant additional testing costs.
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29135/dot_29135_DS1.pdf
• File Type:
  [PDF - 6.92 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:3f6e53e11ca363a3f0dcca1b476666fcd5c003b8b19b37fdfdb48d2720d1b318