At present, only later age predictions (above about 45% hydration) are accurate using the VCCTL elastic codes. Early-age elastic moduli are more difficult to predict and measure. The low connectivity of voxels between phases at early ages causes large inaccuracies. Using higher-resolution digital representations, as well as modifying the connectivity of the finite element mesh, should help resolve this problem. A step in this direction has been to adapt the legacy FORTRAN code to be executable on parallel computers, allowing much larger systems and therefore much higher resolution systems, to be examined computationally (Bohn, 2003). Other research needed includes efforts to model viscoelastic behavior (creep), and the accurate prediction of concrete elastic moduli (Garboczi and Berryman, 2001). Also, marrying durability simulations to elastic moduli prediction capabilities would allow a hydrated microstructure to be exposed to, for example, leaching conditions (the removal of CH) and the elastic moduli of the "degraded" cement paste would then be computed and compared to experiment.