Early-age thermal stresses and long-term drying shrinkage

[Vallenato]

I have a question about early-age thermal stresses and long-term drying shrinkage. Should one combine the effect of these two when calculating crack widths? For example, if you study the classic example of a new wall continuously reinforced without closely spaced joints cast on a stiff foundation. The long-term drying shrinkage can be calculated and together with the restraint level one can calculate the crack widths and increase the amount of reinforcement in the lower parts of the wall in order to reduce the cracks. But when calculating the shrinkage, should one also take into considerations that there may be internal stresses due to the early-age hydration process already in the material making the cracks wider? Or does time and creep reduce the early-age thermal stresses induced in the concrete so that when the long-term shrinkage is developing the early-age thermal stresses has already disappear? I.e. no superposition of the two? Can anyone give guidance and maybe also some kind of reference link?

And additionally, is there a building code etc that give any kind of recommendation when early-age thermal stresses must be considered (like if the wall is more than 400 mm thick, it must be considered etc). Since I guess this is only something to consider in thick members…