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Gaussian Trends In Corrosion Morphologies Of Reinforcing Bar In Concrete Under Marine Environment

Author(s): S. Muthulingam
Paper category: Proceedings
Book title: Proceeding of the 71st RILEM Annual Week & ICACMS 2017
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN:978-2-35158-195-7, 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 425-434
Total Pages: 10
Language : English

Abstract: Reinforcing steel bars have the potential to severely compromise the limit states and thus could lead to premature deterioration and service interruption of infrastructure facilities when subjected to corrosion under aggressive chloride environments. Reinforced concrete structures vulnerable to chloride-induced corrosion potentially experience two stages of damage, namely non-structural and structural. Till date, with regard to non-uniform corrosion, there is very limited information regarding the significant role played by the non- structural stage of damage in influencing the progression of structural damage. Such explorations are critical since they provide a coherent description of the corrosion process under natural exposure. The present work focuses on this point by examining the process of non-uniform chloride ingress into concrete due to the existence of the steel bars and its influence on the spatial and temporal variations in the depth of corrosion penetration. The models used to investigate the non-structural and structural stages of damage are cast into a finite element framework, which sequentially solves the space-time evolution of the physical variables such as temperature, humidity, and chloride at incremental time steps along with the corrosion loss estimates of steel bars. Mathematical models in the form of Gaussian functions are proposed to represent space-time variation in corrosion initiation, spatial spread of corrosion penetration depth and corroded bar morphologies, and are compared with literature data.

Online publication :2017
Publication type :full_text
Public price (Euros) : 0.00

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