- Author
- Bentz, D. P. | Jennings, H. M.
- Title
- Quantitative Characterization of the Microstructure of Hardened Tricalcium Silicate Paste Using Computer Image Analysis.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Book or Conf
- Pore Structure and Materials Properties. Rilem Congress, 1st International. Proceedings. Volume 1. 1987, 49-56 p., 1987
- Keywords
- computers | cements
- Identifiers
- computer image analysis; connectivity; image segmentation; microstructure; pore structure; SEM micrograph; Scanning Electron Microscope (SEM)
- Abstract
- Quantitative characterization of the microstructure of cement paste is necessary in relating physical properties to microstructure and verifying simulation models. Such quantification can be achieved using computer image analysis. Digitized images of micrographs of polished sections of epoxy-impregnated hardened tricalcium silicate paste obtained using a SEM backscatter electron detector are divided into four phases (pores, calcium hydroxide, calcium silicate hydrate, and anhydrous material) based on the level of greyness of each phase. Discrete phases (e.g. calcium hydroxide and anhydroua material) traditionally have been characterized by their number, location, and size distribution. Conversely, the numerical description of phases that are continuous across large portions of a micrograph (e.g. pores and calcium silicate hydrate) is much less developed. New techniques are presented for evaluating the connectivity of a complex pore structure and the ability of different sized particles to move through it. The analytical procedures developed here for tricalcium silicate paste should be applicable to other multi-phase materials.