# The carbon uptake by carbonation of concrete structures – some remarks by perspective of TA

Achternbosch, Matthias; Stemmermann, Peter

##### Abstract:
An issue which recently raised remarkable attention in both industry and politics with regard to CO$_{2}$-emissions of the cement industry is the uptake of CO$_{2}$ into concrete structures from the atmosphere due to weathering. Lobbyists urge to implement this overlooked sink of CO$_{2}$ within the global CO$_{2}$-balances. In this paper we examine the question whether the currently proposed methodology and database are sufficient for implementation. The experimental database is assessed to be doubtful due to inadequate testing. No reliable correlation of carbonation and age of buildings exist. Simple models are insufficient to allow a transfer in real buildings. A compensation of today's emissions with carbon that is sequestered by the existing building stock is implausible. The after-service life is assessed to be of higher importance. But the practicability and the economy of new procedures for enhanced carbonation of crushed concrete are uncertain. On the existing basis, the drafting of guidelines for IPCC appears to be very problematic. There are indications that a substantial fraction of CO$_{2}$ once emitted would remain within the atmosphere for thousands of years. ... mehr

 Zugehörige Institution(en) am KIT Institut für Technikfolgenabschätzung und Systemanalyse (ITAS)Institut für Technische Chemie (ITC) Publikationstyp Forschungsbericht/Preprint Publikationsjahr 2021 Sprache Englisch Identifikator KITopen-ID: 1000131215 HGF-Programm 37.11.02 (POF IV, LK 01) Societally-Feasible Transformation Pathways Weitere HGF-Programme 38.05.02 (POF IV, LK 01) Metals and Minerals Cycle Verlag Karlsruher Institut für Technologie (KIT) Umfang 31 S. Bemerkung zur Veröffentlichung Der Beitrag wird ausschließlich per KITopen veröffentlicht
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