Archive for 'Materials' Tag

What the Heck’s the Difference Between Concrete and Cement?

by Kevin C. on Jul 28, 2009

This is a simple one, though I’m not sure why some people would confuse the two. Sure both are used in construction, and both are related building materials, but they aren’t the same and definitely shouldn’t be used interchangeably.
The rule of thumb is, if the choice is between concrete and cement, the structure in question [...]

A Matter of Tensile Stress and Pressure

by Kevin C. on Feb 10, 2009

Pretty much everything in the world gives you some sort of stress or pressure. In physics, everyone probably knows that pressure is what you get when you divide a force by an area. We’re familiar with the units “psi”, or pounds per square inch. Note that pound in this case is “pound-force” and not “pound-mass”. [...]