That kind of dust is just one more kind of eternal dust. Everything is dust. You and I were and will be dust. Nature allows transformations to take place. All of transformations are doomed from the beginning.
Transformations differ only by time span.
Everything transformed will strive to return to its original natural state. Cement will crumble, and through the slow process where the time doesn t matter, will eventually return to its original state. No one knows. Our life span doesn t allow solutions to answers that are much larger then we are. We are allowed to know only a very small part of the story.