4 ms·
The angle about "reducing waste" seems a bit moot. Sand is plenty and coffee is organic.
by laputan_machine 3y ago
The angle about "reducing waste" seems a bit moot. Sand is plenty and coffee is organic.
- closewith 3y ago> Sand is plenty... Is that true? I was under the impression that suitable sand is a dwindling resource.
- Grazester 3y agoI 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...
- willcipriano 3y agoIsn't most of the planet covered in sand?
- wiredfool 3y agoWind blown sand isn't good for construction, since it's too round or the wrong size.
- willcipriano 3y agoIs all the sand underwater "wind blown sand"? I think there is a huge gap between lacking sand that is convenient for industry and no sand at all like is being claimed.
- deleted 3y ago[deleted]
- slothtrop 3y agoIt depends on the sand / use-case. Sand in concrete is crushed granite/limestone.
- throw0101a 3y ago> Sand is plenty […] Specific sands are needed for specific purposes, and sometimes they can be a challenge logistically. Further, on human time scales, sand is a non-renewable resource: * https://www.bbc.com/future/article/20191108-why-the-world-is-running-out-of-sand https://www.bbc.com/future/article/20191108-why-the-world-is... * https://e360.yale.edu/features/the-hidden-environmental-toll-of-mining-the-worlds-sand https://e360.yale.edu/features/the-hidden-environmental-toll... * https://www.theguardian.com/cities/2017/feb/27/sand-mining-global-environmental-crisis-never-heard https://www.theguardian.com/cities/2017/feb/27/sand-mining-g... * https://www.reuters.com/graphics/GLOBAL-ENVIRONMENT/SAND/ygdpzekyavw/ https://www.reuters.com/graphics/GLOBAL-ENVIRONMENT/SAND/ygd... * https://www.goodreads.com/en/book/show/36950075 https://www.goodreads.com/en/book/show/36950075
- pfdietz 3y agoSand for concrete is increasingly being manufactured by crushing of hard rocks.