Surface Resistivity Testing for Quality Control of Concrete Mixtures

Several properties of fresh and hardened concrete are routinely tested to verify the quality of the construction material with respect to its approved mixture design. Air content, slump and compressive strength may be indicative of certain mixture ingredients or properties; however, there is still a level of uncertainty when it comes to validating water-to-cement ratio (w/c) or the presence of beneficial supplementary cementitious materials. Both these parameters are prescribed to attain a required level of durability in accordance with an exposure type (e.g. exposure to sulfate ions, deicing salts or seawater) even if the minimal mechanical properties have been met. Thus far, there is no simple utilitarian test method which can assess such parameters within a routine quality assurance and acceptance plan. This project will develop a simple quality control/quality assurance (QC/QA) tool to validate the actual mixture design parameters of concrete placed during construction. The test method is based on surface resistivity which has the added value of being low-cost, user-friendly, quick and non-destructive. Previous studies have demonstrated that the w/cm ratio, various supplementary cementitious materials and their combinations used in the concrete mixtures have their own rate of surface resistivity development. This fundamental principle is utilized for this study to develop a QC/QA tool based on specified mixture design criteria which could be used to approve and accept concrete mixtures. This means that strength would no longer be the only value that is used to accept a concrete mixture; finally, a durability requirement would be enacted. This simple tool may help to verify the quality of a placed concrete and provide assurance that it meets the parameters of the accepted mixture design. It can help producers and stakeholders fabricate high quality concrete. As such, it would help control durability problems, prevent premature repair cost, and increase the service life of concrete structures.

    Project

    • Status: Proposed
    • Sponsor Organizations:

      Office of the Assistant Secretary for Research and Technology

      University Transportation Centers Program
      Department of Transportation
      Washington, DC  United States  20590
    • Managing Organizations:

      Southern Plains Transportation Center

      University of Oklahoma
      201 Stephenson Pkwy, Suite 4200
      Norman, OK  United States  73019
    • Principal Investigators:

      Hartell, Julie

    • Start Date: 20171015
    • Expected Completion Date: 0
    • Actual Completion Date: 0
    • USDOT Program: University Transportation Centers Program

    Subject/Index Terms

    Filing Info

    • Accession Number: 01650553
    • Record Type: Research project
    • Source Agency: Southern Plains Transportation Center
    • Files: UTC, RiP
    • Created Date: Nov 1 2017 2:13PM