Open access
Date
2023Type
- Conference Paper
ETH Bibliography
yes
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Abstract
Concrete can act as a carbon sink since CO2 penetrates and reacts with Ca(OH)2 in concrete resulting in the carbonation of concrete, which is a natural process. However, this process is slow due to different factors. Carbonic anhydrase (CA) is a group of enzymes that could be a promising candidate to accelerate CO2 sequestration. CA acts as a catalyzer for CO2 hydration to H+ and HCO3 - and has been reported to increase the reaction rate by about 107 times compared to the process in the absence of CA. Larger amounts of CO2 may thus be sequestered via carbonation in a shorter period. We aim to achieve efficient atmospheric CO2 sequestration in cementitious materials with the help of CA. Preliminary results show that CA maintains enzyme activity and accelerates CO2 hydration in alkaline solutions representative for concrete. Cement pastes with trace amounts of CA exhibited higher carbonation rate at the early stage compared to CA-free cement pastes. While these results are encouraging, more research is needed for further understanding the mechanisms of CA carbonation acceleration in concrete. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000636058Publication status
publishedBook title
Further Reduction of CO2-Emissions and Circularity in the Cement and Concrete Industry, 16th International Congress on the Chemistry of Cement 2023 - ICCC2023Volume
Pages / Article No.
Publisher
Thailand Concrete AssociationEvent
Subject
CO2; Sequestration; Carbonic anhydrase; Cementitious materialsOrganisational unit
09593 - Angst, Ueli / Angst, Ueli
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