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Optical Microscopy and Digital Image Analysis of Bond-Cracks in Cement Based Materials

Published online by Cambridge University Press:  21 February 2011

Adri Vervuurt and
Jan G.M. Van Mier
Adri Vervuurt
Affiliation:
Stevin Laboratory, Delft University of Technology, P.O. Box 5048, 2600 GA Delft, The Netherlands
Jan G.M. Van Mier
Affiliation:
Stevin Laboratory, Delft University of Technology, P.O. Box 5048, 2600 GA Delft, The Netherlands
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Abstract

A new testing method is presented in which the properties of the bond zone between aggregate and matrix in concrete are investigated. The reason for starting the investigation is the improvement of the lattice model, which is developed at the Stevin Laboratory. In the lattice model the material is schematized as a lattice of beam elements. The fracture properties of the individual beam elements are purely brittle, and the use of fracture energy parameters as a material property can be avoided for simulating the non-linear fracture process. In spite of the fact that a locally brittle law is used, the global behaviourshows softening of the material. An improved optical microscopy technique in combination with image processing is adopted for investigating the fracture process during loading.

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