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X-Ray Microtomography of an ASTM C109 Mortar Exposed to Sulfate Attack.

pdf icon X-Ray Microtomography of an ASTM C109 Mortar Exposed to Sulfate Attack. (430 K)
Bentz, D. P.; Martys, N. S.; Stutzman, P. E.; Levenson, M. S.; Garboczi, E. J.; Dunsmuir, J.; Schwartz, L. M.

Materials Research Society. Microstructure of Cement-Based Systems/Bonding and Interfaces in Cementitious Materials. Materials Research Society Symposium Proceedings Volume 370. November 28-December 1, 1994, Boston, MA., Materials Research Society, Pittsburgh, PA, Diamond, S.; Mindess, S.; Glasser, F. P.; Roberts, L. W., Editor(s)(s), 77-82 pp, 1995.


building technology; microtomography; mortar; x ray microtomography; sand


X-ray microtomography can be used to generate three-dimensional 5123 images of random materials at a resolution of a few micrometers per voxel. This technique has been used to obtain an image of an ASTM C109 mortar sample that had been exposed to a sodium sulfate solution. The three-dimensional image clearly shows sand grains, cement paste, air voids, cracks, and needle-like crystals growing in the air voids. Volume fractions of sand and cement paste determined from the image agree well with the known quantitites. Implications for the study of microstructure and proposed uses of X-ray microtomography on cement-based composites are discussed.