CT Analysis of Ancient Concretes

This project will continue collaborative research between geologists and engineers at Iowa State University and Iowa Department of Transportation (DOT) into the evolution of pore networks in extremely long-lived Iowa concrete pavements. The results of a preliminary study of three concretes showed that the deterioration of coarse aggregates created an air void system in pavements before air entrainment was practiced. For this study, first the project team will make thin sections of the concretes to examine deteriorating coarse aggregate particles and determine their lithology and mode of deterioration. Second, the team will computerized tomography (CT) scan the remaining samples of concrete obtained in an earlier study (Hanson, 2007) that represent a spectrum of ages and methods for pavement manufacture from Iowa. These sample will also be thin sectioned and the state of their coarse aggregate particles will be evaluated. Third, the team will provide the DOT with a computer code that provides similar metrics to the RapidAir 457 Air Void Analyzer but for CT images (e.g., spacing factor, specific surface, number of voids, void size distribution).

• Supplemental Notes:
  • Contract to Performing Organization has not yet been awarded.

Language

• English

Project

• Status: Completed
• Funding: $121984
• Contract Numbers:

  Addendum 624

  18-SPR0-008

• Sponsor Organizations:

  Iowa Department of Transportation

  800 Lincoln Way
  Ames, IA  United States  50010
• Project Managers:

  Clute, Khyle

• Principal Investigators:

  Hasiuk, Franek

• Start Date: 20170701
• Expected Completion Date: 20190228
• Actual Completion Date: 0

Subject/Index Terms

• TRT Terms: Air voids; Coarse aggregates; Concrete pavements; Deterioration; Evaluation; Lithologic composition; X ray analysis
• Geographic Terms: Iowa
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01645868
• Record Type: Research project
• Source Agency: Iowa Department of Transportation
• Contract Numbers: Addendum 624, 18-SPR0-008
• Files: RIP, STATEDOT
• Created Date: Sep 7 2017 4:20PM