Journal ArticleDOI
PHYSICAL MODEL FOR STEEL CORROSION IN CONCRETE SEA STRUCTURES ApPLICATION
TLDR
In this paper, a simplified calculation of corrosion rates and times to corrosion cracking of concrete cover is presented, based on the theoretical physical model developed in a companion paper, which is applied to calculate the effective resistance of the corrosion cell and treating oxygen and chloride ion transport through concrete cover as quisi-stationary and one-dimensional.Abstract:
The theoretical physical model developed in a companion paper, is applied to a simplified calculation of corrosion rates and times to corrosion cracking of concrete cover. Setting up approximate estimates of effective resistance of the corrosion cell, and treating oxygen and chloride ion transport through concrete cover as quisi-stationary and one-dimensional, the corrosion problem is reduced to ordinary differential equations in time. For determining the extents of cathodic and anodic areas and the thickness of the rusting layer, a new principle stating that the actual corrosion current is maximum is postulated. Various steady-state corrosion processes are then analyzed, and after developing approximate formulas for the time of steel depassivation due to chloride ions and for cover cracking due to volume expansion of rust, a number of illustrative numerical examples are given. Diffusivities for chloride ions and oxygen are shown to be usually the controlling factors.read more
Citations
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Journal ArticleDOI
Reinforcement corrosion in concrete structures, its monitoring and service life prediction - A review
TL;DR: In this paper, the authors present a review on the mechanism of reinforcement corrosion, techniques utilized to monitor reinforcement corrosion and methodologies that are utilized for the prediction of remaining service life of structures.
Journal ArticleDOI
A model for prediction of time from corrosion initiation to corrosion cracking
Tamer El Maaddawy,Khaled Soudki +1 more
TL;DR: In this article, a mathematical model that predicts the time from corrosion initiation to corrosion cracking is presented, where a relationship between the steel mass loss and the internal radial pressure caused by the expansion of corrosion products is developed.
Journal ArticleDOI
Modeling Cover-Cracking due to Reinforcement Corrosion in RC Structures
TL;DR: In this article, a simple analytical model is formulated to demonstrate the mechanical consequences of corrosion-product buildup around the bar, and the service life is estimated as the time required for cover failure.
Journal ArticleDOI
Test methods for on site measurement of resistivity of concrete — a RILEM TC-154 technical recommendation
TL;DR: In this paper, the authors describe methods to assess concrete resistivity on site for various purposes related to corrosion and protection of reinforcement, based on the first draft of a forthcoming RILEM Technical Recommendation.
Journal ArticleDOI
Modeling the Dynamic Corrosion Process in Chloride Contaminated Concrete Structures
T Liu,R.W Weyers +1 more
TL;DR: In this article, a non-linear regression model was developed, which demonstrates that corrosion of steel in concrete in service exposure conditions is a function of the concrete chloride content, temperature and ohmic resistance, and active corrosion time.
References
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Journal ArticleDOI
Physical model for steel corrosion in concrete sea structures theory
TL;DR: In this article, a physical-mathematical model for concrete exposed to sea water is developed for concrete, which describes: (1)Diffusion of oxygen, chloride ions, and pore water through the concrete cover of reinforcement; (2) ferrous hydroxide near steel surface; (3) depassivation of steel due to critical chloride ion concentration; (4) the cathodic and anodic electric potentials depending on oxygen and ferrous hyroxide concentrations according to Nernst equation; (5) the polarization of electrodes due to changes in concentration
Book ChapterDOI
Further results on center of dilatation and residual stresses in joined elastic half-spaces
D.L. Guell,John Dundurs +1 more
TL;DR: In this article, the authors show that the elastic fields due to a subregion near the interface between two different materials undergoing a volume change can be obtained by differentiation from the corresponding fields for the homogeneous material.
Lok-tests determine the compressive strength of concrete
B C Jensen,M W Braestrup +1 more
TL;DR: In this article, the loadbearing capacity of an embedded bolt which is pulled out by application of counter-pressure (lok-test) is determined by applying a plastic analysis to determine the load bearing capacity of the bolt, and it is proved that if the angle between the direction of deformation and the failure surface is identical to the angle of friction, the pullout force will then be proportional to the compressive strength of the concrete that is being tested.
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