Passive Layer Degradation of Reinforced Concrete Steels in the Marine Environment: Thermochemical Model
Van Quan Tran1, Hoang Long Nguyen2, Minh Viet Nguyen3, Huu Nam Nguyen4, Quang Hung Nguyen5

1Van Quan Tran, University of Transport Technology, Hanoi, Vietnam.
2Hoang Long Nguyen, University of Transport Technology, Hanoi, Vietnam.
3Minh Viet Nguyen, Institute for Hydropower and Renewable Energy, Hanoi, Vietnam.
4Huu Nam Nguyen, Institute for Hydropower and Renewable Energy, Hanoi, Vietnam.
5Quang Hung Nguyen, Thuyloi University, Hanoi, Vietnam

Manuscript received on 18 June 2019 | Revised Manuscript received on 25 June 2019 | Manuscript published on 30 June 2019 | PP: 1162-1167 | Volume-8 Issue-5, June 2019 | Retrieval Number: E7402068519/19©BEIESP
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Abstract: This paper is interested in the modeling of the process of depassivation of reinforcement of a saturated concrete exposed to seawater. In particular, it attempts to describe the degradation of the passive layer of reinforcement and the conditions under which it provides more protection. In order to achieve this, a model coupling multi-species transport and Thermochemical is set up. The model takes into account the chemical imbalance involved in the diffusion transport of ions contained in seawater as well as the chemical reactions occurring and its consequences in terms of dissolution at the passive layer. It allows to study the thermodynamic equilibrium of iron oxide in a concrete polluted by sea water and to quantify the duration beyond which the initiation of the corrosion can begin according to the nature of the constituents of the passive layer. It shows, in addition, the kinetics of degradation of the passive layer.
Keywords: Degradation, Passive layer, Reinforcement Concrete, Marine Environment, Thermochemical Model.

Scope of the Article: Environmental Engineering