Role of Coarse Aggregate on Chloride Intrusion in HPC Bridge Decks

The overall goal is to identify an effective test method to reduce uncertainty concerning the use of certain Iowa aggregate sources for manufacturing high performance concrete (HPC) for bridge decks. The research team's approach is to investigate typical Iowa HPC coarse aggregates and study the relationships between the aggregate properties, especially the pore system properties, and concrete permeability. The specific objectives of the proposed study include the following: (A) To examine the relationship between the coarse aggregate pore properties and concrete permeability/chloride ingress measured using different methods (e .g., natural chloride penetration and electrical methods); (B) To identify the properties (such as porosity, median pore throat diameter, etc.) that describe the main features of aggregate pore structure; (C) To critically evaluate test methods for quantifying key pore system properties of coarse aggregates effectively; and (D) To establish criteria for accepting Iowa coarse aggregates for the manufacture of low permeability HPC for Iowa bridge decks.


    • English


    • Status: Completed
    • Funding: $159942
    • Contract Numbers:

      Addendum 614


    • Sponsor Organizations:

      Iowa Department of Transportation

      800 Lincoln Way
      Ames, IA  United States  50010
    • Principal Investigators:

      Wang, Kejin

    • Start Date: 20170701
    • Expected Completion Date: 20181231
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01645250
    • Record Type: Research project
    • Source Agency: Iowa Department of Transportation
    • Contract Numbers: Addendum 614, TR-728
    • Files: RIP, STATEDOT
    • Created Date: Aug 30 2017 3:21PM