What type of sand should I use to put tubers in over winter?

Yes, the article did say you could dry the sand overnight. There were 2 options: to bake the sand and to dry it overnight naturally.

You need to break up the tubers and replant them 1 m (40") apart. If you don't do this, it won't produce many artichokes.

Only in climates where the ground does not completely freeze during the winter. Otherwise the tubers must be dug up and stored in a cold but frost-free location until the...

Mulch them with leaves, clippings or soil. Snow will help insulate them, too.

You can use polymeric sand, also called joint sand, between your pavers to fill in the cracks.