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Ecological Concrete: manufacturing without cement is now possible!

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Ecological concrete manufacturing without cement, it is now possible

Developed by researchers at Kaunas University of Technology (KTU) in Lithuania, a new eco-friendly concrete is a promising material that could soon help reduce construction-related pollution.


What is ecological concrete?

Made from industrial residues, this low carbon concrete made with ecological cement based on silico-aluminates would be as strong as concrete based on Portland cement, while being more environmentally friendly. As its manufacture does not require heating, the adoption by construction professionals of this low-carbon concrete would indeed make it possible to significantly reduce CO2 emissions.
Another significant advantage at a time of global warming , this ecological cement would limit the accumulation of heat thanks to its lighter color than that of traditional concrete.

The origin of ecological cement

The production of this ecological cement involves the use of industrial residues containing an active form of silica and alumina: ash from aluminum factories or coal-fired power stations, metakaolin or blast furnace slag. This slag was also widely used in France at the beginning of the 20th Century for the manufacture of ecological concrete ahead of its time. According to the company Ecocem, which produces hydraulic binders from slag from steelworks blast furnaces, the manufacture of ground slag emits 38 times less CO2 than that of Portland cement.
According to Kaukas University civil engineering and architecture researcher Vitautas Bocullo, any material containing an active form of silica and alumina could be used, allowing raw material to be sourced from factories. local, further reducing manufacturing costs and CO2 impact. The residues resulting from the use of biofuels or the manufacture of porcelain, for example, could thus enter into the composition of this ecological concrete.

Less polluting low carbon concrete

The idea of ​​adopting an ecological cement is not to everyone's taste. Although it has proven itself and allows the manufacture of low-carbon concrete that respects the environment, its use remains marginal worldwide. Yet the 4 billion tonnes of Portland cement produced each year alone generate 7% of CO2 emissions!
In France, the adoption of these ecological alternatives would be further hampered by the cement lobby and its standards limiting the proportion of slag in concrete intended for construction.
We will therefore have to wait a bit to build an ecological concrete house and benefit from its anti-heat wave properties!
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