A great article because I have always been fascinated with the fact that Roman concrete gets STRONGER as it ages and will set perfectly and grow stronger UNDER WATER !

But there was one thing I was looking for that was glaringly missing from the article.

How did they discover this secret formula ?

Cheers

"There is nothing as impenetrable as a closed mind"
and ..." if everything is a coincidence what is the point of studying or measuring or analyzing anything ?" db