In his book Concrete Planet, author Robert Courland discusses why the concrete first used by the Romans is more durable than the concrete used in most present day buildings. Plus, mineralogist Peter Stemmerman tells us about his invention, Celitement and why it is greener than Portland cement.
Robert Courland is the author of “Concrete Planet: The Strange and Fascinating Story…” (Prometheus, 2011). He’s based in San Francisco, California.
Peter Stemmermann is a mineralogist at the Karlsruhe Institute of Technology. He’s based in Karlsruhe, Germany.