2 edition of migration of chiloride ions in concrete. found in the catalog.
migration of chiloride ions in concrete.
Kyle David Stanish
Written in English
|The Physical Object|
|Number of Pages||245|
Chloride-induced corrosion is one of the most revealing cause of deterioration leading to premature durability loss by structural concrete. Among mechanisms governing penetration of chloride ions into the concrete, ingress by simple diffusion is the most decisive one for concentration-driven transport. The use of Fick’s law of diffusion of the second type does in general permit a modest Cited by: 5. 1 3rd International Conference on the Durability of Concrete Structures Paper Number XX September Queen’s University Belfast. The effect of other ions on chloride migration in concrete. Peter Claisse. Coventry University.
adjusted to maintain the target slump. The composition of prepared concrete mixes is shown in Table3. Standard mm cube specimens were cast for compressive strength testing and cylinders with dimensions of mm for chloride ion migration testing. Prisms of mm were cast for carbonation by: In this study the electrochemical technique is applied to accelerate chloride ion migration in concrete to determine the chloride ions in anode cell. This paper presents a new method for determining the chloride migration rate in concrete from steady state migration test by measuring the electrical by:
Chloride ion concentration. In chloride-contaminated concrete, it is necessary to determine the concentration of chloride ions at various depths in order to determine the likelihood of corrosion of the reinforcing steel. To do this dust samples (see separate entry) are taken from increments of depth (say 5 to 25 mm, 25 to 50 mm, 50 to 75 mm etc. The diffusion and migration of ions in concrete is a complex interaction of a multitude of factors such as concentration of migrating species in different layers of the concrete, physical properties of the concrete, etc. It is thus not possible to investigate the influence of one single parameter on ion migration using real concrete.
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First, the theory for chloride migration in concrete is presented and implemented in an open-source finite element code and typical situations such as chloride penetration and extraction on a reinforced concrete beam with real reinforcement arrangement are calculated using experimental characteristics obtained in the previous research.
The uneven distribution of an electric potential around the rebars Cited by: 4. Corrosion damage accelerates migration of chloride ions in migration of chiloride ions in concrete.
book. • Corrosion damage is induced by expansive stress of Friedel’s salt. • Corrosion damage lead to non-linear diffusion of chloride ions. • Spatial-temporal distribution of damage and chloride ions were : Hui Xu, Hui Xu, Jian-kang Chen. Ionic interactions of multi-species are significant for studying the chloride migration in cracked concrete.
The multi- and single-component models have totally distinct transport features, not only for the electrostatic potential distributions but also for the chloride penetration by: Usually, the reinforced concrete structure exposed in deicing salts, surrounding of salt sprays and in the peripherals of sea water from which these chloride ions slowly penetrate into the concrete, mostly through the pores in the hydrated cement.
The results showed that the resistance increases with decreasing pore size if a certain limit is exceeded. This limit appears to be related to the ion species and the concentration of the ions in the solution.
INTRODUCTION. CHLORIDE CONTAMINATION THROUHGH DIFFUSION. CHLORIDE EXTRACTION THROUGH MIGRATION. CONCRETE RESISTIVITY. EXPERIMENTAL PROCEDURE. The migration of ions from the electrolyte was insignificant. This demonstrated the important role of internal ions in transferring the charge during extraction; simultaneously, the decomposition or transformation of hydrated products is by: 1.
During the ECE treatment with simultaneous migration of silicate ion, the chloride ions in reinforcement concrete structure can be removed. Due to the reinforcement concrete densification during the ECE treatment, the chlorides ions in external environment can be prevented from diffusing into the by: Concrete specimens were subjected to external electrical potential (30 V) to force chloride ion migration.
Three cylindrical specimens of diameter mm were used each time, they were sliced into. In the case of the migration test, having two chambers with solutions, the effect of increasing water around the rebar is not noticeable, but in the case of concrete (cathodic protection, realkalization or chloride removal) the effect will be dependent of the potential applied or the lasting of the by: results in a migration concrete test [16, 17].
i i i i i i i i p. z D c x c z D F RT x x E x x E. 2 (2) Xinying Lu  stated that if concrete is considered a solid electrolyte, the diffusivity of charged species. is related to its partial conductivity. i, and this relationship is know as the Nernst-Einstein equation. Therefore, an electric field is used to speed up a flow of chloride ions.
On the basis of obtained results, we can either calculate a passed charge or a migration coefficient. The determined coefficient of migration according to NT BUILD characterized chlorides ingress into concrete.
This article presents a brief review of the models aimed to predict the penetration of chloride ions in concrete. The work highlights the two well-known approaches i.e. Fick's laws and Nernst. Challenges of Concrete Construction: Volume 3, Repair, Rejuvenation and Enhancement of Concrete THE EFFECT OF PORE SIZE ON ION MIGRATION IN CONCRETE DURING ELECTROCHEMICAL CHLORIDE EXTRACTION.
A Comparison of Chloride Ion Diffusion Coefficients Derived from Concentration Gradients and Non-Steady State Accelerated Ionic Migration, Materials and Structures, 29 (),A steady-state chloride migration test with a constant electrical potential drop of 15 V was conducted with a saturated mm diameter × 50 mm long concrete specimen.
The migration coefficient of chloride ions for concrete was calculated using the constant Cited by: Modeling the rapid chloride migration test for concrete using the lattice model and characteristic Galerkin approach.
of concrete to chloride ion penetration. A steady-state chloride migration test with a constant electrical potential drop of 15 V was conducted with a saturated mm diameter × 50 mm long concrete specimen.
The migration coefficient of chloride ions for concrete was calculated using the constant flux on the basis of the Nernst–Planck by: Diffusion and migration are the two major transport ways of chloride ions in concrete.
The single-species models were usually used to predict the chloride diffusion and migration behavior. However, the diffusion and migration processes of chloride ions in concrete Author: Zijian Song, Linhua Jiang, Jinxia Xu, Chuansheng Xiong, Hongqiang Chu, Yan Zhang.
Chloride binding is the process that captures the free chloride ions with cement composition and hydration products in concrete  and is one of the most important phenomena in. The chloride diffusion coefficient is directly related to the property of concrete to resist the ingress of chloride ions and it is a decisive factor for the durability Magazine of Concrete Research.
ISSN the chloride diffusion coefficient estimated based on the rapid chloride migration test is different compared to the actual Cited by: 1. Estimation of diffusion coefficients for chloride ion penetration into structural concrete Article in Aci Materials Journal 99(5) September with Reads How we measure 'reads'.In order to investigate the chloride ion penetration resistance of coal gangue concrete under multi-factor comprehensive action, the non-steady-state accelerated chloride ion migration test was used to test the chloride diffusion law of coal gangue concrete specimens by crack width, curing temperature and water-cement ratio.
Three groups of crack width (0 mm, - mm, - mm Author: Beijing.Mechanisms of Chloride Ion Transport Capillary absorption, hydrostatic pressure, and diffusion are the means by which chloride ions can penetrate concrete. The most familiar method is diffusion, the movement of chloride ions under a concentration gradient.
For this to occur, the concrete must have a continuous liquid phase and thereFile Size: KB.