Sugar is a solid. It's not a gas or liquid. Cement is a liquid mixture of solids.
No, I don't think sugar will have enough time to diffuse through Cement without actually mixing it in. If you poor sugar on top of poured cement it may diffuse a bit, but not throughout the whole thing.
Cement doesn't even flow like water for the most part.
Again, not an expert, I understand basic physics and the properties of things. I could be wrong.
Would sugar move via the act that is water moving? No, sugar is not water.
Movement of water towards to more concentrated compartment
Osmosis is the spontaneous net movement or diffusion of solvent molecules through a selectively-permeable membrane from a region of high water potential to a region of low water potential, in the direction that tends to equalize the solute concentrations on the two sides. Wikipedia
I'm no expert, I looked it up. It won't destroy concrete unless crazy large amounts are dumped in the mix.
Yes, while mixing. Like any other chemical reaction it requires contact to make the reaction. If the contact is limited to a certain area only that area will be impacted. It's not magic. The sugar doesn't multiply and move itself through the median.
Sugar is a solid. It's not a gas or liquid. Cement is a liquid mixture of solids.
No, I don't think sugar will have enough time to diffuse through Cement without actually mixing it in. If you poor sugar on top of poured cement it may diffuse a bit, but not throughout the whole thing.
Cement doesn't even flow like water for the most part.
Again, not an expert, I understand basic physics and the properties of things. I could be wrong.