Coarse Aggregate Deterioration in Granular Surfaces and Shoulders TR-769

The objective of the proposed research is to characterize the microstructural changes in coarse aggregate (CA) as it is exposed to weathering in granular surfaces and shoulders on Iowa roads. The research team will assess this though both petrophysical testing and petrographic inspection to identify the chemical (e.g., dissolution of primary minerals, precipitation of secondary minerals) and physical weathering processes (e.g., abrasion and freeze-thaw cycles) responsible for CA deterioration. The team will assess how current Iowa DOT grading for concrete stone CA (e.g., Iowa Pore Index test) predicts performance of CA used in granular surfaces and shoulders. The ultimate outcome of the proposed research will be a set of guidelines to better predict the performance of CA used in granular surfaces and shoulders. This project will continue collaborative research between geologists and engineers at Iowa State University, the Iowa Department of Transportation, and Iowa county governments towards developing a better understanding of CA quality.


    • English


    • Status: Active
    • Funding: $262470
    • Contract Numbers:


      Add 683

    • 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:

      Goetz, Vanessa

    • Principal Investigators:

      Cetin, Bora

    • Start Date: 20181215
    • Expected Completion Date: 20201130
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01690782
    • Record Type: Research project
    • Source Agency: Iowa Department of Transportation
    • Contract Numbers: TR-769, Add 683
    • Files: RIP, STATEDOT
    • Created Date: Jan 14 2019 11:07AM