We would like to thank the members of the Virtual Cement and Concrete Testing Laboratory and the NIST HYPERCON project for partial support of this work. We would also like to thank D.P. Bentz for processing cement data, for translating the original elastic code from Fortran to C, and for useful discussions. We thank P.E. Stutzman for imaging the L cement so that it could be added to the Virtual Cement and Concrete Testing Laboratory cement database. We thank A. Boumiz for supplying a copy of his thesis and original cement paste elastic data.