Concrete compression strength test
Jearl Walker www.flyingcircusofphysics.com
February 2016 Concrete has tremendous strength under compression (opposite ends pushed toward each other) but is normally weak when under tension (opposite ends pulled in opposite directions). Thus, it is useful in supporting buildings and bridges. Here is a video that dramatically demonstrates that even in compression, there is a limit for what concrete can withstand, said to be the ultimate strength.
http://www.dump.com/crushconcrete/ same video
Here is another video:
High-strength concrete has an ultimate strength of 40 million newtons per square meter, or about 5800 pounds per square inch. The concrete cylinders seen in the videos are weaker. Testing the strength of common concrete is, of course, important for us to understand if concrete structures remain stable after aging and weathering. Sadly, concrete structures sometime fail and people are hurt or lost.