CO2 uptake by carbonation of concrete during life cycle of building structures

Edna Possan - Universidade Federal da Integração Latino-Americana, Emerson Felix - University of São Paulo, William de Araujo Thomaz - Universidade Federal da Integração Latino-Americana

The cement manufacturing process has been responsible for about 5 to 7 % CO2 emissions. However, during its life cycle, concrete structures are submitted to carbonation and can uptake part of CO2 emitted during its construction. In order to corroborate this potential, this study applied mathematical modeling to evaluate the performance of compression strength from a 20, 30 and 40 MPa concrete produced with different types of cements (CP III, CP IV and CP V, ARI) from 0 to 100 years of age. Based on these parameters, it was found out that CO2 uptake is directly ratable to the concrete superficial area exposed to CO2, influenced by the type of cement and concrete strength. CO2 emissions balance may become an indicator of sustainability and, in the future, it can be considered a compensatory measure in the concrete structures project.

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