The authors would like to thank Stefania Nuzzo, Abdelmajid Elmoutaouakkil, and all the staff from the Materials Division at CSTB for their valuable assistance and important contributions during the preparation for and the execution of the experiments at the ESRF facility. They would also like to thank Dr. Richard Spal of NIST for a detailed review of the manuscript. Symoane Mizell would like to thank the SURF summer student program at NIST for funding her efforts on this project. Funding for the creation of the Visible Cement Data Set website was provided by the Advanced Technology Program at the National Institute of Standards and Technology.