RECYCLING CEMENT FROM DEMOLISHED BUILDINGS . . .

[Oscar]

RECYCLING CEMENT FROM DEMOLISHED BUILDINGS: A GROUND-BREAKING DEVELOPMENT

[ https://acehub.org.au/news/recycling-ce ... evelopment ]

CONSTRUCTIONCIRCULAR ECONOMYCEMENT BY ASHMEETA SUBRA JUNE 6TH, 2024

EXCERPT: "Scientists have discovered a method of recycling cement from demolished concrete buildings, revolutionising the cement industry and significantly reducing its carbon footprint.

Cement production is a major contributor to global carbon emissions, responsible for approximately 7.5 per cent of all anthropogenic carbon dioxide (CO2) emissions. The traditional production method involves heating limestones to extreme temperatures using fossil fuels, which often releases significant amounts of CO2 into the atmosphere.

Fortunately, Cambridge University scientists have recently proposed a solution that could significantly reduce the emissions intensity of cement. The solution involves reactivating used cement by exposing it to high temperatures, a process successfully demonstrated at small-scale electric arc furnaces. This innovative approach utilises the heat generated by another heavy industry – steel recycling. [ https://www.weforum.org/agenda/2023/01/ ... onization/ ]

According to lead scientist Cyrille Dunant, this could achieve zero-carbon cement production, not only reducing emissions but also making steel recycling less polluting, as chemicals currently used in the process have a high carbon cost.

“We have shown the high temperatures in the furnace reactivate the old cement and because electric arc furnaces use electricity they can be powered by renewable power, so the entire cement making process is decarbonised,” Cyrille told BBC. . . . . "

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