We have known about the composition of Roman Concrete for a long time, the main difference is we trade long term strength for a shorter curing time. For an exce

We have known about the composition of Roman Concrete for a long time, the main difference is we trade long term strength for a shorter curing time. For an excellent dissection of this recent round of "secrets technology of the ancients that our modern science only now is beginning to understand" check out this reddit thread, it has quite a few engineering students and professionals chiming in and I learned quite a bit from it. http://www.reddit.com/r/science/comments/1fohl2/berkeley_discovers_a_way_to_make_concrete_that_is/ http://www.reddit.com/r/science/comments/1fohl2/berkeley_dis...