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. 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.
VIEW ENTIRE REPORT
Report number: cmr16-001
Published: July 2015
Project number: TR201414
Author(s): John T. Kevern, Ceki Halmen, and Dirk Hudson
Performing organization: University of Missouri-Kansas City
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