Chris Hogg wrote:

tabbypurr wrote:

The Natural Philosopher wrote:

According to wiki it is in itself a sort of cement,

I can't find anywhere it says that

You haven't looked very hard! Like I said in my reply to the OP, it's
pozzolanic. See the Wiki link.

Isn't a pozzolan something that helps a cement to set/bind, rather than
being a cement itself?