Measuring three-dimensional damage of mortar in compression with X-Ray microtomography and digital image correlation

John S. Lawler, Denis T Keane, Surendra P. Shah

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

The fracture process of cement-based materials caused by compressive loading is a complex, three-dimensional phenomenon that occurs as a result of material heterogeneity and complicated mixed-mode cracking mechanisms. However, obtaining three-dimensional information describing this process requires equipment- and time-intensive techniques. One such technique is X-ray Microtomography, which provides high resolution data, but is limited to small specimens. A more straightforward technique, Digital Image Correlation (DIC), can be used to characterize the fracture pattern of a wider range of specimens, but only in two dimensions on the surface. In order to determine the relationship between surface and internal cracking, mortar specimens were tested in compression and examined using both DIC and X-ray Microtomography. Microtomography is an X-ray technique that can be used to produce three-dimensional images which reveal the full internal structure of the specimen, including cracks and pores. DIC is a Computer Vision technique that compares successive images to measure two-dimensional deformation on the surface of the specimen, providing information on the location and opening of surface cracks. Rectangular mortar specimens (25.4 mm x 12.7 mm x 12.7 mm) were loaded to certain levels past the peak stress to induce significant cracking and then unloaded. Deformations of the unloaded specimen were measured with DIC and used to determine crack shape, size and location. This surface phenomena was compared to the shape and size of internal cracks seen in tomographic reconstructions of the same specimen. It was observed that these techniques give complementary information about crack geometry and development.

Original languageEnglish (US)
Title of host publicationHigh-Performance Concrete
EditorsH.G. Russell
PublisherAmerican Concrete Institute
Pages187-202
Number of pages16
ISBN (Electronic)9780870316883
StatePublished - Jan 1 2000
EventHigh-Performance Concrete Research to Practice 1999 - Chicago, United States
Duration: Mar 14 1999Mar 19 1999

Publication series

NameAmerican Concrete Institute, ACI Special Publication
VolumeSP-189
ISSN (Print)0193-2527

Conference

ConferenceHigh-Performance Concrete Research to Practice 1999
Country/TerritoryUnited States
CityChicago
Period3/14/993/19/99

Keywords

  • Concretes
  • Digital image
  • Evaluation
  • Fracture
  • Tomography

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • General Materials Science

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