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:
  Admixtures Concrete Durability Electrical Resistivity Evaluation Field Tests Laboratory Tests Permeability Quality Assurance
• 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.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:3f6e53e11ca363a3f0dcca1b476666fcd5c003b8b19b37fdfdb48d2720d1b318
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29135/dot_29135_DS1.pdf
• File Type:
  [PDF - 6.92 MB ]