Concrete and steel production are major sources of CO2 emissions, but a new solution from Cambridge could recycle both at the same time. Throwing old concrete into steel-processing furnaces not only purifies iron but produces “reactivated cement” as a byproduct. If done using renewable energy, the…
Depends on your definition of “recycled” (spoiler: you’ve been lied to).
Concrete = cement + sand + aggregate (rubble) + water
Cement: requires a lot of energy to product
Sand: riverbed sand, no desert sand
Aggregate: some crushed rock-like stuff (of varying sizes)
“Recycling” concrete, is done by crushing it and using as either road filler, or aggregate for new concrete with worse properties than the original. It doesn’t turn concrete back into “cement + sand + aggregate”.
For an example, check this funny definition of “recycling” (*with just some waste) from Sika:
“Recycling” concrete, is done by crushing it and using as either road filler, or aggregate for new concrete with worse properties than the original. It doesn’t turn concrete back into “cement + sand + aggregate”.
I mean… That’s recycling. You literally just said “you’ve been lied to” and then immediately followed it up with an explanation of how it’s recycled. And then you literally linked an article that explains that concrete is recycled…
However, within a recycling economy, old concrete may be recycled and reused within new concrete production. This is already being done in the concrete industry. Ultimately, we strive for a circular economy, where there is no waste at all in the concrete production and recycling process.
If you think “recycling” a thing means throwing part of it away, then adding some fundamental non-renewable component in order to make the same thing again, or that “recycling” is not the same as “circular production”… maybe you’ve not only been lied to, but also brainwashed?
Also, yeah that’s literally how recycling works… do you think they recycle the labels on glass bottles? no they burn them off to get the glass. Then they make a new bottle, then they put new labels on it. literally doing exactly what you’re saying “isn’t recycling”.
Still, that’s not at all what happens when recycling concrete.
Depends on your definition of “recycled” (spoiler: you’ve been lied to).
Concrete = cement + sand + aggregate (rubble) + water
“Recycling” concrete, is done by crushing it and using as either road filler, or aggregate for new concrete with worse properties than the original. It doesn’t turn concrete back into “cement + sand + aggregate”.
For an example, check this funny definition of “recycling” (*with just some waste) from Sika:
https://www.sika.com/en/knowledge-hub/can-concrete-be-recycled.html
I mean… That’s recycling. You literally just said “you’ve been lied to” and then immediately followed it up with an explanation of how it’s recycled. And then you literally linked an article that explains that concrete is recycled…
If you think “recycling” a thing means throwing part of it away, then adding some fundamental non-renewable component in order to make the same thing again, or that “recycling” is not the same as “circular production”… maybe you’ve not only been lied to, but also brainwashed?
Also, yeah that’s literally how recycling works… do you think they recycle the labels on glass bottles? no they burn them off to get the glass. Then they make a new bottle, then they put new labels on it. literally doing exactly what you’re saying “isn’t recycling”.
Still, that’s not at all what happens when recycling concrete.