MODIFICATION OF THE X-RADIOGRAPHY TECHNIQUE TO INCLUDE A CONTRAST AGENT FOR IDENTIFYING AND STUDYING MICROCRACKING IN CONCRETE

The utility of X-radiography for the study of microcracking in concrete is significantly enhanced by impregnating cracks and voids with a lead-nitrate contrast agent. When an X-ray flux is passed through a polished concrete specimen, X-rays are readily attenuated by the contrast agent in the cracks, which produces a sharp tonal contrast in the resulting radiograph between cracks and surrounding concrete. Radiographs obtained using this technique are compared with more conventional X-ray images of the same specimens. This method is similar in concept to neutron radiography, in which a neutron-attenuating contrast agent is used for enhancing crack images.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3528769
• Corporate Authors:

  American Society for Testing and Materials (ASTM)

  100 Barr Harbor Drive, P.O. Box C700
  West Conshohocken, PA  United States  19428-2957
• Authors:
  • Najjar, W S
  • Hover, K C
• Publication Date: 1988-6

Media Info

• Features: Photos; References;
• Pagination: p. 15-19
• Serial:
  • Cement, Concrete and Aggregates
  • Volume: 10
  • Issue Number: 1
  • Publisher: American Society for Testing and Materials (ASTM)
  • ISSN: 0149-6123
  • Serial URL: http://journalsip.astm.org/JOURNALS/CEMENT/cca_home.html

Subject/Index Terms

• TRT Terms: Concrete; Contrast; Cracking; Detection and identification; Detectors; Microcracking; Stress tests (Equipment); Test procedures; X ray analysis
• Uncontrolled Terms: Concrete cracking
• Old TRIS Terms: X ray stress analysis
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00477183
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 30 1988 12:00AM