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Accelerated carbonation: changes in water transport, porosity and phases of mortar due to different CO 2 pressures

  • Currently, the carbonation resistance of concrete is assessed on the basis of accelerated tests performed with high (unrealistic) CO2 concentrations. It remains unclear whether these high concentrations reflect the processes occurring under natural conditions and enable the accurate prediction of field behaviour. To develop future test procedures with higher reliability, it is necessary to deepen the knowledge on the mechanisms of carbonation. Thin slices of mortar were stored in a gaseous mixture of 2 % CO2 and 98 % N2 at atmospheric pressure or 5 bar. IH-NMR equipment was used to detennine moisture profiles with aresolution of 0.2 mm. At 5 bar a drying front at the near-surface region of the mortar discs severely inhibited the progression of the carbonation reactions. This effect was prevented by exposure to altemating cycles of pressure and storage at atmospheric pressure (65%RH) which significantly increased the rate of carbonation, but was too severe to resolve the effect of cement type on carbonation resistance. Furthermore , the evolution of water beyond the carbonation front of mortar sampies under accelerated concentration and at atmospheric pressure was clearly visible. This may lead to an overestimation of carbonation resistance of sampies tested under accelerated conditions at the optimal relative humidity for natural carbonation (50-70% RH).

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Metadaten
Author:Charlotte ThielORCiD, Robin E. Beddoe, Dirk Lowke, Christoph GehlenORCiD
URL / DOI:https://mediatum.ub.tum.de/doc/1230854/1230854.pdf
Parent Title (English):Proceedings of the 10th fib International PhD Symposium in Civil Engineering, July 21 to 23, 2014, Québec, Canada
Document Type:conference proceeding (article)
Language:English
Year of first Publication:2014
Creating Corporation:Fédération International du Béton (fib)
Release Date:2022/11/25
First Page:217
Last Page:221
Institutes:Fakultät Bauingenieurwesen
Fakultät Bauingenieurwesen / Labor für Baustoffe
Publication:Externe Publikationen
research focus:Gebäude und Infrastruktur
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG
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