Grady is back to school us about those tiny 'sparks' that flew away from the launch pad when SpaceX's rocket launched in November 2020.
Apparently the concrete that SpaceX uses for their launch pad isn't quite the same as the concrete that sits as the walkway outside my classroom window.
Grady explains what concrete is (hydrated crystals) and then tests two types of concrete exposed to three heat environments (room temp, home oven, and propane torch) under compression strength tests.
Not shockingly, the heated concretes broke at way less force.
He then goes on to explain how most of this weakness is caused by our old nemesis: thermal expansion.
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