Calibrating the Iowa Pore Index with Mercury Intrusion Porosimetry and Petography

Iowa weather is tough on pavements. Multiple freeze-thaw cycles during winters cause some road aggregates to crumble. To overcome this problem, the Iowa DOT has developed a method to predict the ultimate durability of a concrete road based on the nature of the crushed rock used for the pavement's construction. This method combines mineralogical analysis, chemistry, and the character of the rock's pore system. The pore system test is called the Iowa Pore Index test and was developed by the Iowa DOT as an environmentally friendly test method. The Iowa test method has gained acceptance by several Midwestern Departments of Transportation (like Michigan and Ohio), while other states still rely on durability beams. There is national interest in this test to the extent that an AASHTO/ASTM standard test method has been drafted. Deliverables include: Thin section photomicrographs and descriptions; Test result data; Recommendations for improvement of the Iowa pore index testing method; Discussion or hypotheses for discrepancies between ASTM 666 durability beam test and results of the Iowa pore index test; Final report including: Discussion of what geological factors (e.g. porosity types, pore throat size distribution, grain types, mud-to-grain ratio) relate to Iowa-DOT aggregate durability classification; A comparative database of geologic, petrographic, geochemical and petrophysical properties of studied samples; Recommendations for future work; and Summary presentation of project data, results, discussion and recommendation to the TAC group.

    Language

    • English

    Project

    • Status: Active
    • Funding: $98413
    • Contract Numbers:

      Addendum 553

      RB08-016

      18-SPR0-010

    • Sponsor Organizations:

      Iowa Department of Transportation

      800 Lincoln Way
      Ames, IA  United States  50010
    • Managing Organizations:

      Iowa State University, Ames

      Center for Transportation Research and Education
      2711 South Loop Drive, Suite 4700
      Ames, IA  United States  50010-8664
    • Project Managers:

      Dawson, Bob

    • Performing Organizations:

      Iowa State University, Ames

      Center for Transportation Research and Education
      2711 South Loop Drive, Suite 4700
      Ames, IA  United States  50010-8664
    • Principal Investigators:

      Hasiuk, Franek

    • Start Date: 20150715
    • Expected Completion Date: 20180930
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01662477
    • Record Type: Research project
    • Source Agency: Iowa Department of Transportation
    • Contract Numbers: Addendum 553, RB08-016, 18-SPR0-010
    • Files: RiP, STATEDOT
    • Created Date: Mar 9 2018 2:38PM