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Title: Multi-contrast 3D X-ray imaging of porous and composite materials

Grating-based X-ray computed tomography allows for simultaneous and nondestructive determination of the full X-ray complex index of refraction and the scattering coefficient distribution inside an object in three dimensions. Its multi-contrast capabilities combined with a high resolution of a few micrometers make it a suitable tool for assessing multiple phases inside porous and composite materials such as concrete. Here, we present quantitative results of a proof-of-principle experiment performed on a concrete sample. Thanks to the complementarity of the contrast channels, more concrete phases could be distinguished than in conventional attenuation-based imaging. The phase-contrast reconstruction shows high contrast between the hardened cement paste and the aggregates and thus allows easy 3D segmentation. Thanks to the dark-field image, micro-cracks inside the coarse aggregates are visible. We believe that these results are extremely interesting in the field of porous and composite materials studies because of unique information provided by grating interferometry in a non-destructive way.
Authors:
;  [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [1] ;  [5]
  1. Lehrstuhl für Biomedizinische Physik, Physik-Department and Institut für Medizintechnik, Technische Universität München, 85748 Garching (Germany)
  2. (France)
  3. (United Kingdom)
  4. European Synchrotron Radiation Facility, 38000 Grenoble (France)
  5. (Germany)
Publication Date:
OSTI Identifier:
22398914
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 15; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ATTENUATION; CEMENTS; COMPOSITE MATERIALS; COMPUTERIZED TOMOGRAPHY; CONCRETES; CRACKS; GRATINGS; IMAGES; INTERFEROMETRY; NONDESTRUCTIVE ANALYSIS; POROUS MATERIALS; REFRACTIVE INDEX; RESOLUTION; SCATTERING; X RADIATION