Karl Townsend wrote:

At least by 1000 BC, the ancients were making Pozzolan cement in much
the same way a lot of it is made today: fine-ground, reactive types of
volcanic ash, mixed with slaked lime.

Pozzolan has been used for thousands of years, while Portland cement
has been around for about 150 years.

You seem to be a history buff on concrete...

How is it that Henry Flagler could build concrete piers in the ocean
100 years ago in the FL Keys and have the concrete still be in great
shape. Meanwhile everything built more than 20 years ago is falling
apart in the Keys.


They were built by the low bidder, and not inspected. Remember all
the substandard work uncovered by hurricane Andrew in Miami?


--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.