In article , davidlobsterpot601
@hotmail.com says...
I remember once, years ago, having to paddle through an ankle-deep
puddle of highly cementitious water in my trainers (long story), and not
having the opportunity to get cleaned up for ages afterwards, and being
quite worried about it - but nothing happened at all.

A bloke I used to work for told a story of a labourer he was working
with on a big pour who got his rigger boots full of slurry - he didn't
notice anything until he was washing his feet later and all the skin
came off.