A high-resolution three-dimensional (3D) scanning technique called x-ray microtomography was applied to measure internal damage and crack growth in small mortar cylinders loaded in compression. Synchrotron-based microtomography allows us to resolve internal features that are only a few microns in size. Multiple tomographic scans were made of the same specimen at different levels of deformation using a custom-built loading frame. Three-dimensional image analysis was used to measure internal crack growth during each deformation increment. Measured load-deformation curves were used to calculate the nonrecoverable work of the external load on the specimen. Nonrecoverable work of load was related to measured incremental change in crack surface area to estimate work-of-fracture in three dimensions. Initial results indicate a nearly constant work-of-fracture for the early stages of crack growth. These results show that basic fracture mechanics principles may be applied to concrete in compression; however, one must think in terms of 3D multiple crack systems rather than traditional 2D single crack systems.

  • Availability:
  • Supplemental Notes:
    • This work is supported by the National Science Foundation (CMS-9733769) under a program directed by Dr. John Scalzi. Parts of this research were conducted at the National Synchrotron Light Source, Brookhaven National Laboratory, which is supported by the U.S. Department of Energy, Division of Materials Sciences and Division of Chemical Sciences (DOE contract number DE-AC02-76CH00016). Additional support of the U.S. Air Force Office of Scientific Research is also acknowledged.
  • Corporate Authors:

    American Society of Civil Engineers

    1801 Alexander Bell Drive
    Reston, VA  United States  20191-4400
  • Authors:
    • Landis, E N
    • Nagy, E N
    • Keane, D T
    • Nagy, G
  • Publication Date: 1999-6


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00765099
  • Record Type: Publication
  • Contract Numbers: CMS-9733769, DE-AC02-76CH00016, MAT97-0564
  • Files: TRIS
  • Created Date: Jun 24 1999 12:00AM