What Is Concrete?

from Gizmodo

Concrete is literally ubiquitous.  According to this post from Gizmodo, concrete is the most popular artificial material on Earth.  Two things that we know about concrete for certain:  Concrete will get hard and concrete will crack.  Beyond that, what is there to know?  For example, what makes concrete the ideal swimming pool structural material?  This post answers all of the possible questions about concrete, gives its origins, the chemistry behind its curing, and talks about the history and future of this versatile material.

Here is an excerpt from the post: