[Eupalinos of Megara appears out of a time portal from ancient Ionia] Wow, you guys must be really good at digging tunnels by now, right?
[Eupalinos of Megara appears out of a time portal from ancient Ionia] Wow, you guys must be really good at digging tunnels by now, right?
Why would a grout accelerant burn people?
The Lime in Portland cement.
Linky
Guessing it is an oxidizer
Pozzalanic materials also tend to be very alkaline. Industrial dumping of waste concrete can create a huge environmental hazard.