We propose to synthesize modem techniques of image analysis with the existing knowledge of concrete deterioration and failure processes in order to develop a comprehensive and efficient basis for quantitative microscopic analysis of the damage mechanisms in concrete. The focus of this research is on microstructural attributes which best characterize damage mechanisms in concrete; these include: (1) the volume, spatial distribution, networking, tortuosity, orientation, number, width and spacing of microcracks and cracks; (2) volume, spatial distribution, number, continuity, shape and size of voids; and (3) contiguity relationships of microcracks, cracks, voids, aggregates, and aggregate-paste interfaces. The following objectives are proposed to be accomplished in Phase I research: (1) identify the quantifiable micro structural features which reflect on prevalent damage mechanisms; (2) select image analysis and statistics principles and tools for evaluation of the quantifiable features; (3) develop a sampling plan for quantification and statistical inference of microstructural damage; (4) select suitable sample preparation and microscopy techniques; (5) experimentally verify the approach; and (6) devise an integrated computer-based system dedicated to the implementation of the new approach to micro structural damage quantification of concrete
