3 ms·
I was wondering the same thing about sand.
by Grazester 3y ago
I was wondering the same thing about sand.
- hkt 3y agoYou're both correct. Building grade sand is scarce and its extraction is environmentally catastrophic.
- laputan_machine 3y agoSand is cheaper per kilo than used coffee grounds. "Building-grade sand" is sharp sand. It is the cheapest sand you can buy. Roman's built things out of their concrete which was full of random bits of rubble, and some of these structures still stand today.
- hkt 3y agoCorrection: they used lime mortar. Modern concrete was created about a century and a half ago. The random bits were chunks of lime which increased the building's hydraulic qualities - lime self heals, concrete doesn't
- slothtrop 3y agoYes, but concrete does not use this grade. It's crushed granite and limestone, i.e. the most sustainable. -- https://www.builderspace.com/types-of-sand-used-in-construction https://www.builderspace.com/types-of-sand-used-in-construct...