#598 Why was the Hoover Dam so difficult to build?
Why was the Hoover Dam so difficult to build? Because the river was very strong and the dam was so big, the concrete would take 125 years to set. A…
Why was the Hoover Dam so difficult to build? Because the river was very strong and the dam was so big, the concrete would take 125 years to set. A…
I learned this today. Concrete goes hard because the filler (usually something like gravel) is glued together by the binder (usually cement) through the process of hydration. Concrete is probably…
I learned this today. Pykrete is a frozen material made of 14% sawdust and 86% water. It is as strong as concrete. Pykrete was put forward during World War II…