If a plastic PVC pipe is totally covered with cement? Does a minor crack/s in the concrete will also crack PVC pipe or damage it? I mean cracks such as due to very minor seismic movements?
If the pipe is totally encased in concrete small surface cracks would not affect. If the cracks go all the way through, like a total crack in a foundation, it could also damage the pipe. If the concrete has shifted along the crack line then the pipe is going to be damaged. The amount of damage will depend on the type of re- enforcement done when laying the concrete. What is the pipe used for?
California building code requires to insulate sewer pvc pipes that will touch concrete if has potential to condensation. This is to prevent pipe cracks. I would recommend insulating since its involves little labor and cost to avoid future problems.
Piping subject to operation at temperatures that will form condensation on the exterior of the pipe shall be thermally insulated.