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Global warming potential of carbonation/chloride exposed concrete with(out) consideration of the propagation period in service life assessment
When studying concrete's susceptibility to carbonation-/chloride-induced corrosion, the focus is usually on the corrosion initiation period. Service life prediction performed as such only quantifies the time to depassivation of the reinforcing steel and does not involve any damage. As a consequence, the actual service life is underestimated. In this paper, it has been evaluated whether the time between steel depassivation and unacceptable corrosion-induced cracking is significant or not. This information is important because it affects the expected number of rehabilitation actions with time and therefore also the sustainability of a concrete composition. Service life calculations done in compliance with the well-known DuraCrete models imply that the propagation period cannot be neglected in a carbonation exposed environment (exposure class XC3), especially for concrete with supplementary cementitious materials such as fly ash and silica fume (propagation periode > 100 years). On the other hand, the propagation period was observed to be very short (max. 8.7 years) in a chloride exposed environment (exposure class XS2). Logically, the differences in global warming potential for not considering the propagation period were mainly important in presence of carbonation. In exposure class XS2, the sole consideration of the initiation period can be acceptable.
Global warming potential of carbonation/chloride exposed concrete with(out) consideration of the propagation period in service life assessment
When studying concrete's susceptibility to carbonation-/chloride-induced corrosion, the focus is usually on the corrosion initiation period. Service life prediction performed as such only quantifies the time to depassivation of the reinforcing steel and does not involve any damage. As a consequence, the actual service life is underestimated. In this paper, it has been evaluated whether the time between steel depassivation and unacceptable corrosion-induced cracking is significant or not. This information is important because it affects the expected number of rehabilitation actions with time and therefore also the sustainability of a concrete composition. Service life calculations done in compliance with the well-known DuraCrete models imply that the propagation period cannot be neglected in a carbonation exposed environment (exposure class XC3), especially for concrete with supplementary cementitious materials such as fly ash and silica fume (propagation periode > 100 years). On the other hand, the propagation period was observed to be very short (max. 8.7 years) in a chloride exposed environment (exposure class XS2). Logically, the differences in global warming potential for not considering the propagation period were mainly important in presence of carbonation. In exposure class XS2, the sole consideration of the initiation period can be acceptable.
Global warming potential of carbonation/chloride exposed concrete with(out) consideration of the propagation period in service life assessment
Van den Heede, Philip (Autor:in) / Callens, Renée (Autor:in) / De Belie, Nele (Autor:in)
01.01.2015
International Conference on Sustainable Structural Concrete, Proceedings ; ISBN: 978-987-3838-02-6
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
DDC:
690
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