The concrete shortage is something I, as a masonry contractor, have been struggling with all year. I run a block wall up four feet and may wait days before I can get a grout truck. It takes a day to run the wall up again and the waiting resumes.
It's not just concrete either, the cement powder shortage also affects premixed mortar and cinder block manufacturing. The normal 4-6 week lead time for special order block has stretched into 7 months on one of my jobs. The masonry supply store I frequent quit selling mortar mix to the general public, contractors only. Even still, the supplier gets a truck in and it's sold off by noon, everybody wants to stock up so they don't run out halfway through a project.
Foundations by others are delayed, slabs aren't being poured on time, it's left my job scheduling in tatters.
