Concrete: we can't live with it, can't live without it. A combination of cement, water and ground rock or sand, on the surface concrete might seem crushingly mundane. Yet it has defined construction in recent centuries and with it, in part, modernity.
원문출처 : https://www.cnn.com/style/article/concrete-alternatives-future-building/index.html
원문출처 : https://www.cnn.com/style/article/concrete-alternatives-future-building/index.html