The Pantheon and Colosseum in Rome show how strong concrete is. It is made from sand, small stones, water and clinker, a lime-based binder that has to be baked in very hot ovens. The most widely ...

This was the first time that Central Japan Railway Co. (JR Tokai), which is building the maglev line, allowed reporters to visit a tunnel being ... a ring-shaped concrete wall more than 50 ...