Sign up for our Newsletter

Publications

Pro109-1

PREDICTING CHLORIDE INDUCED DEPASSIVIATION AND MINIMUM CONCRETE COVER WITH DIFFERENT BINDERS



Author(s): Ingemar Löfgren, Tang Luping, Oskar Esping, Anders Lindvall
Paper category: Proceedings
Book title: proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Service Life of Cement-Based Materials and Structures
Editor(s): Miguel Azenha, Ivan Gabrijel, Dirk Schlicke, Terje Kanstad and Ole Mejlhede Jensen
ISBN:978-2-35158-170-4
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 172-181
Total Pages: 10
Language : English


Abstract: Corrosion of steel reinforcement represents the major cause affecting durability of reinforced
concrete structures in road and marine environments. To assure durability, standards attempt
to provide specifications for long-term performance by simple deemed-to-satisfy rules for
approximate environmental classification. This paper presents results from a study of
modelling of chloride ingress in concrete with fly ash and ground granulated blast-furnace
slag. Chloride threshold values for corrosion initiation are discussed. A physical model,
ClinConc, was employed to calculate the chloride ingress profiles after exposure under
marine (submerged) and road environments for 100 years. The model was validated using
field data after exposure in the Swedish seawater for about 20 years. The results show that the
addition of mineral additions in general increases the resistance of concrete to chloride ingress
and allows smaller concrete cover thicknesses. However, one critical parameter is the chloride
threshold value. In consideration of both the chloride resistance and the alkalinity, which
influence the critical chloride threshold value, the concrete with mineral additions still reveals
sufficient margin to allow a significantly lower chloride threshold for initiation of corrosion
of reinforcement steel in concrete.


Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00


>> You must be connected to view the paper. You can register for free if you are not a member