Examination of Pore Structure Using Three Dimensional Image Analysis of Microtomographic Data
Publication Name: Concrete Science and Engineering
In this study concrete microstructure and related durability issues were examined using a high resolution three-dimensional scanning technique called x-ray microtomography. Microtomography is similar in practice to conventional medical CAT-scans, however a synchrotron x-ray source combined with a high-resolution detector produces a 3D spatial resolution close to one micron. Three dimensional image analysis techniques required to extract quantitative information from the data were explored. In particular, porosity, pore size distribution, and the preferential pathways to the specimen interior from the surface were of interest. Using standard image processing techniques such as segmentation and connectivity analysis porosity and pore size distributions were measured for two different data sets of different spatial resolutions: 6 µm and 1.2 µm. The measurements showed reasonable agreement with results of others using different measurement techniques.