I've been to places in Europe where concrete structures built by the Romans still stand in spite of the centuries. The same hold true in the Americas with structures built by the Aztecs, Mayans, and Incans.
Volcanic ash? Makes a lot of sense for many places, including Mexico where huge volcanoes exist. But Yucatan and Peru? Should be interesting what they discover.
Read the story @ Roman concrete used secret ingredient to stand the test of time and now engineers want to copy it Daily Mail Online
Volcanic ash? Makes a lot of sense for many places, including Mexico where huge volcanoes exist. But Yucatan and Peru? Should be interesting what they discover.
Read the story @ Roman concrete used secret ingredient to stand the test of time and now engineers want to copy it Daily Mail Online