A NEW VISION FOR AIR-VOID ANALYSIS

The current methods to determine air void parameters in concrete were developed more than 50 years ago, and although they have served the industry well, they have a number of shortcomings. This paper discusses the possibility of using computerized tomography (CT) x-ray scans that are used widely in the medical field to obtain images of the human body; the equipment is designed to reconstruct data and determine air void parameters in both two and three dimensions. Preliminary testing performed on small samples of fresh and hardened concrete and mortar revealed that aggregate, paste, and air voids were easily detected and each could be isolated for further examination. To take CT scanning for air-void analysis in concrete to the next level requires developing customized software and a prototype CT scanning unit and correlating scanning results with standard tests and freeze-thaw performance of concrete.

• Corporate Authors:

  Portland Cement Association

  5420 Old Orchard Road
  Skokie, IL  United States  60077
• Authors:
  • Thomas, M
• Publication Date: 2002-3

Language

• English

Media Info

• Features: Figures;
• Pagination: p. 6
• Serial:
  • Concrete Technology Today
  • Volume: 23
  • Issue Number: 1
  • Publisher: Portland Cement Association

Subject/Index Terms

• TRT Terms: Aggregates; Air voids; Concrete; Fresh concrete; Pastes; Scanners; Tomography; X ray analysis
• Subject Areas: Geotechnology; Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00962954
• Record Type: Publication
• Report/Paper Numbers: CT021
• Files: TRIS
• Created Date: Sep 5 2003 12:00AM