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What enables an 80% CO2 reduction compared to ceramic facing bricks?

The 80% CO2 reduction is caused by 2 factors:

On the one hand, with the Vibropress and mixing process, we no longer need energy-intensive high-temperature kilns. So the bricks are not fired, but pressed and held together using a binder. Firing clay (calcination) causes a chemical reaction that emits large quantities of CO2. As we do not work with clay here, the CO2 emissions of the Lowie Bricks during the production process are only a fraction of the CO2 emitted when producing clay bricks.

On the other hand, there is the accelerated process of carbonation. This is a natural binding process in which weak hydroxides start to bind with CO2. The speed of this process depends on the CO2 access to the rock mass. Because there is a high air content in the Lowie Bricks (e.g. much higher than in concrete), there is also a high CO2 absorption potential. Consequently, there is an exceptionally fast carbonation process that results in the capture of 58% of the CO2, initially emitted during the production of the base materials, over the lifetime of the brick (period of 30 years).

Both these factors result in total emissions (over the entire life cycle of the brick) of 8.47 kgCO2/m². For clay bricks, this is 42 kgCO2/m².

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