Steel rebar, the world’s favorite reinforcement material for concrete, greatly increases tensile strength in concrete. Due to concrete’s rigidness and tendency to shrink and expand, reinforcement is necessary in many cases to reduce cracking and slow structural failure. This material is elementary to most of throughout the construction industry, but what you may not be familiar with is how much stress steel rebar must be under before it completely snaps in half.
Gav and Dan, also known as The Slow Mo Guys, have amassed a huge youtube audience simply by filming awesome things, mostly exploding, in super slow motion. Their most recent video shows what it looks like when a piece of #11 grade 60 steel rebar, which measures 1.41 in (35.81mm) in diameter, is put under enough force to completely snap it in half. The force is measured in kips, which the guys called “pulling apart force” (technical term), one of which equals 1000 pounds-force.
The experiment, which was filmed at the University of Purdue’s College of Engineering, showed that it took 157.401 kip of force, or 157,401 pounds of force, before the rebar broke. Watching the footage slowed down to 28,000 frames per second (fps) and again at 148,000fps allows you to see the millions of steel particles that explode into the air as the steel breaks.
Everyone has a camera in their pocket these days and when something goes down on the jobsite, you can bet it’s going to be captured on video one way or another. That can either be a great thing for marketing or an awful way to showcase your business.
Look, you could mobilize on site the boring old way by loading your heavy equipment on the bed of a trailer and driving it to site, or you could take a note from the Bravo Company of the 37th Engineer Battalion of the United States and spice things up a bit.
“World’s Largest” is definitely a sought after goal, especially in the construction industry. Sarens, a crane rental, heavy lifting, and engineered transport company in Belgium, has recently released a supersized crane that is being regarded as the largest crane in the world, by both size and lifting capacity.
Multiple buildings imploded at the same time with multiple different camera views? Sounds like the making of a great demolition video.
A construction crane that was working on a highway widening project in St. Martin Parish in Louisiana collapsed onto the adjacent roadway last week, injuring one driver.
Demolition by implosion videos are always fun to watch. Adding an element of water makes them even more dramatic, though it’s probably not great for the ecosystem. Late last week, a one mile long, 23 year-old bridge in China was imploded in front of a crowd of spectators and caught on camera.
Cranes are an extremely useful and important piece of equipment on the majority of construction sites. They can also be extremely dangerous if they are not understood or respected.