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Jakarta Clubbing & Meet New Friends Message Board › You can do this at home

You can do this at home

user 192643171
Banjarmasin, ID
Post #: 11
I'm Andrew Smyth, aerospace engineer and finalist of the Great British Bake Off. And today I'm gonna be using baking to explore the extraordinary engineering https://splinternews....­ behind the everyday material we take for granted - concrete. From the Shard in London to the Burj Khalifa in Dubai, concrete is a ubiquitous material now.

But from it's usage in Roman times to today, engineers have had to be a little bit crafty to enable us to build taller, bigger, and stronger structures. http://creativity-onl...­ But first of all, what is concrete? Concrete is made up of aggregate, which is basically just small and large rocks, and is bound together by cement.

Now what's really important about concrete is on it's own it is a brittle material. So under the microscope, it's made up of lots of little crystals. What https://www.huffingto...­ that means - in compression, so when the material is being pushed together, it's really strong. In tension, when it's pulled apart, it's very weak.

So when we think of a bridge, if you put a load on top of that, the bottom surface is pulling apart in tension, and the top is pushing together https://www.prisonpla...­ in compression. That means if we're just building with concrete, we're gonna have a very thick and expensive bridge. What else is like concrete?

Caramel. I've got my sugar there, and I'm gonna add in some cold water. And then I'm gonna pop on my hob. So I've got my caramel bar here. I've just melted­ that down, cast it into a bar, and now we're gonna test how strong it is. So I've just got four little pots here. And this is my caramel bridge.

So this is the pure concrete example. And this is a low tech demo, you can do this at home. I've just got a bolt - you can drop anything solid on this. https://www.the-pool....­ Watch how easily this shatters. So you see, absolutely shattered. And if you look at the side of these surfaces, it is glassy and sharp, and just like a broken pane of glass.
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