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Originally Posted by Xabia Jim  I've heard the strongest concrete is that poured under water..... |
That reminds me of the Roman pozzolan concrete that sets under water. Smart guys those Romans.
Here's a quote from a web site on the construction of the Pantheon.
"These [foundation] rings are made of pozzolan concrete consisting of travertine pieces in layers held together by a mortar of lime and pozzolan. This will be discussed later in this work. Interestingly enough, the Jutland Society's investigation showed the foundation material had become "rock hard,"11 a case we might expect when we study the chemistry of pozzolanic reaction under these conditions."
And this from Wikipedia.
"The Roman port at Cosa was built of Pozzolana that was poured underwater, apparently using a long tube to carefully lay it up without allowing sea water to mix with it. The three piers are still visible today, with the underwater portions in generally excellent condition after 2100 years."
Cool.
James