Regarding rebar - in my country communists build a lot of "wielka płyta" (big pre-stressed concrete panels) commie blocks. Around 20% of Poles still live in the

Regarding rebar - in my country communists build a lot of "wielka płyta" (big pre-stressed concrete panels) commie blocks. Around 20% of Poles still live in these. These buildings were built since sixties, and designed to stay for 50 years, but so far they seem to hold rather well, none of them were destroyed so far in a building catastrophe, not even when there were gas explosions in some blocks. They were a little modified from the standard commie thing (for example stainless steel was used for joining the panels), and they had lots of usability problems (noise and temperature insulation), but from durability POV they seem to work better than expected. I wonder if in next decades 20% of the country will have to buy a new house, cause that might be a huge economic change.