Schmutziger Baustoff: Wie Beton ersetzt werden kann - TAAmuseum

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Beton hat eine miese Klimabilanz, aber der Bedarf ist hoch und wird steigen. Forschende arbeiten an neuen Rezepturen, die auch besser haltbar sein sollen. Worauf sie dabei setzen.

Von

Beton hat eine miese Klimabilanz. Rund sieben Prozent der globalen Triebhausgasemissionen gehen auf ihn zurück. Das liegt am Zement, der nötig ist, um den Baustoff fest werden zu lassen. Bei der Herstellung, weltweit sind es gut vier Milliarden Tonnen pro Jahr, wird viel Kohlendioxid (CO₂) frei: schätzungsweise bis zu zwei Milliarden Tonnen aus chemischen Reaktionen sowie beim energieintensiven Brennen der Rohstoffe.

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