ASSESSING THE CO2-BINDING OF CONCRETE DURING ITS SERVICE LIFE

Author(s): Andreas Leemann (1), Fritz Hunkeler (2), Heiner Widmer (3)
Paper category: Proceedings
Book title: SynerCrete’18 International Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 653-658
Total Pages: 6
Language : English

Abstract: In order to assess the impact of cement production on the atmospheric CO2 concentration and with it on the global warming, not only the CO2 emissions but also the CO2 capture by carbonation of cementitious products during their service life needs to be considered. The key parameter for a reasonably accurate estimation is the carbonation coefficient that allows to calculate the temporal evolution of carbonation depth and the CO2 adsorption by the cement hydrates. Current approaches use a strength-based concept linking carbonation coefficient and compressive strength. This approach has proven to be valid for Portland cement-based
concrete, but appears to be questionable in the case of concrete produced with blended cements, which are prevalent nowadays. Based on recent scientific findings showing an excellent correlation between the CO2 binding capacity of concrete and the carbonation
coefficient, an alternative approach is proposed.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00