Fly Ash Library
The Fly Ash Library website is a repository of selected papers which were presented at the 1999 and 2001 International Ash Utilization Symposia. These papers are the ones for which authors have given permission for placement on this website The symposia are organized by the Center for Applied Energy Research at the University of Kentucky.
http://www.flyash.info/
The Visible Cement Dataset Homepage
Science, Technology, Materials, Concrete and Mortar - Visible Cement Dataset. A collection of three-dimensional data sets of hydrating cement, Plaster of Paris, and common brick material, all obtained using x-ray microtomography at the European Synchrotron Radiation Facility in Grenoble, France.
https://visiblecement.nist.gov/