Is it true that the world is running out of sand to produce concrete, and if so, why is that?
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We have hardwood floors. You have socks that have little grippy dots on the bottom so you don’t slide around when you’re running around the house, and this gripping power is called friction. Your regular socks are no good for playing in the house because you will not be able to stop. Concrete needs the grippy sand because the sand is gripping the cement and gravel together, and we want concrete to always stop after it has cured.
The cheap, naturally occurring grippy sand is being gobbled up fast because it is useful for concrete- on land or being dredged up from lakes and ponds. River and beach sand- basically any sand that’s already gone through long term erosion processes – isn’t grippy enough to be used in concrete.
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