The author would like to thank Robert Flatt for providing the sphere size distributions used in the polydispersivity study and James Sims and Willian George for working on the parallel implementation of the code. The author would also like to thank Andreas Acrivos, John Brady, Jack Douglas, German Drazer, Ray Mountain, and Norman Wagner for useful conversations. This work was supported by the Virtual Cement and Concrete Testing Laboratory (VCCTL) consortium, the Center for Advanced Cement Based Materials (ACBM), and the HYPERCON program at the National Institute of Standards and Technology.