I derived my opinion by reading the article, noticing there was no description of the burn, and then noticing the incredibly small fine and relatively relaxed attitude by regulators. If you'd read my comment again I didn't say it was a cement burn, just that that is an example of a mild burn. The real irony is if it was just a curing accelerant, then it was an incredibly mild burn, and you're still wrong.
It's interesting, though, that your first impulse is to defend the robber barons that made this happen.