> concrete
Actually we have been depleting the planets sand resources for a good while now, and could be facing a "sand crisis" in the not distant future, largely thanks to concrete:
https://www.smithsonianmag.com/science-nature/world-facing-g...
Actually we have been depleting the planets sand resources for a good while now, and could be facing a "sand crisis" in the not distant future, largely thanks to concrete:
https://www.smithsonianmag.com/science-nature/world-facing-g...
We could just grind rocks instead of causing erosion in water ways. However, we would need a good energy source to run a grinder/crusher. We are improving along those lines of energy production. Natural, sand is made by wind and hydro power. So if we keep it that way we should fine.
Also it seems to more of we are collecting sand and other aggregate in haphazard way. I am not sure I would call that running out? Unless sources with low environmental impact are running out?
https://www.quora.com/Why-is-desert-sand-not-used-for-constr...
For particular demanding applications all sand is sifted and structure/shape of the sand checked.
For evening more demanding application sand may be produced via crushing to get long flat sand grains.
Also the checking of the quality of sand is called sieve analysis.