What percentage of new ingredients are required each time?
What is the energy input needed per kilo of output steel/concrete?
moring 293 days ago [-]
> What is the strength of the resulting cement?
According to the article, the clinker has the same composition as the "normal" one. The strength _should_ therefore be the same, but must still be tested of course. In case it is different, the analysis why this is the case would certainly be interesting.
> What is the energy input needed per kilo of output steel/concrete?
... compared to separate processing for steel and clinker. The article makes it sound like we get the clinker "for free" because the energy input is required to make steel anyway, but there is no word about whether it actually needs the same amount of energy with the added slag, or more.
tuatoru 291 days ago [-]
Indeed. Just like "steel", there isn't just one "cement". Different cements have different uses for different concretes.
readthenotes1 292 days ago [-]
Making cement is a huge carbon emitter.
Making concrete often includes fly ash from coal plants (and the reduction of coal powered plants has increased the cost of fly ash and reduced its availability to the point where it was being rationed last summer <according to my relatives in the concrete biz>)
https://www.nature.com/articles/s41586-024-07338-8
What percentage of new ingredients are required each time?
What is the energy input needed per kilo of output steel/concrete?
According to the article, the clinker has the same composition as the "normal" one. The strength _should_ therefore be the same, but must still be tested of course. In case it is different, the analysis why this is the case would certainly be interesting.
> What is the energy input needed per kilo of output steel/concrete?
... compared to separate processing for steel and clinker. The article makes it sound like we get the clinker "for free" because the energy input is required to make steel anyway, but there is no word about whether it actually needs the same amount of energy with the added slag, or more.
Making concrete often includes fly ash from coal plants (and the reduction of coal powered plants has increased the cost of fly ash and reduced its availability to the point where it was being rationed last summer <according to my relatives in the concrete biz>)