In the following table, please enter the particle size distribution of the aggregates in the original (normal weight) concrete mixture and the fraction (volume/number) of aggregates that are going to be replaced by lightweight aggregates. When the simulation is finished, you can view the water distribution in your model concrete, along with a table indicating the `protected' paste volume as a function of distance from the LWA surfaces. If you provide your e-mail address, you will be notified when your simulation is complete and your results are ready for viewing. Computer codes are also available for exploring internal curing with ellipsoidal-shaped particles (e.g., fibers, etc.) and quantifying the three-dimensional spatial characteristics of such microstructures. Contact Dale Bentz (email@example.com) if you are interested in obtaining copies of these programs written in the C programming language.