Concrete chloride penetration

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The ability of chloride ions to penetrate the concrete must then be known for design as well as quality control purposes. The penetration of the concrete by chloride ions, however, is a slow process. It cannot be determined directly in a time frame that would be useful as a quality control measure.

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impenetrable concrete. Therefore, the resistance to penetration of chloride ions into concrete must be known for design as well as quality control purposes and, in order to assess this resistance to chloride penetration, test methods are needed to allow the determination of .


Chloride Penetration - Mechanism. The penetration of chloride ions into reinforced concrete structures is the major contributing factor for inducing corrosion of the steel reinforcement. The chloride penetration is a diffusion process, when the concrete is saturated with water and when cement does not react too much with these salts. Any reinforcement is in a concrete practically saturated with water, when its cover is rather thick and is not too dry (e.g. structures in marine or mountain sites).
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In addition, the penetration of chloride ions should be also related to water content of concrete because it is practically a transportation process of ions in concrete. The dependence of the diffusion coefficient of chloride ions on the water content of concrete was referenced to the results obtained before [6].

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This research investigates the chloride penetration in reinforced concrete under flexural load. In this paper, the chloride penetration in cracked and uncracked concretes in plain concrete as well as in reinforced concrete were experimented and modelled. The resistance against chloride penetration is determined by accelerated testing. 2 FIELD OF APPLICATION. The method is applicable to test specimens from existing structures and to new samples older than 28 maturity-days. The concrete test specimens must be free from construction faults such as cavities and visible cracks.

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Chloride ion penetration meter. The test is performed to monitor the amount of electrical current passing through concrete cores or cylinders. A potential difference is maintained across the ends of the specimen, one of which is the negative end and is immersed in a sodium chloride solution, the other (positive end) in a sodium hydroxide solution. A commonly used test method for concrete mixture evaluation for chloride penetration in the United States is the “Test Method for Electrical Indication of Concrete’s Ability to Resist Chloride Ion Penetration” (ASTM C; AASHTO T ), commonly referred to as the rapid chlo- .

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3 Chloride€Penetration€on€the€Surface€of€Concrete The€ chloride€ penetration€ into€ concrete€ can€ be€ assumed€ to€ comply€ with€ the following€equation€according€to€Fick’s€2 nd €law€of€diffusion. Reinforced concrete structures under cyclic exposure to the corrosive environment such as the tidal zone as a part of marine structure entail the higher risk of steel corrosion. In this paper, chloride penetration in concrete exposed to the tidal zone was predicted using a Author: Sung In Hong, Ki Yong Ann.
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This test method determines the penetration of chloride ion into concrete from a sodium-chloride solution pond. This method is applicable to all types of concrete, as well as to concretes treated with systems such as sealants, penetrating sealers, or thin-bonded overlays. penetration of chloride into concrete. ACI committee reports: “the permeability of concrete to water and chloride is the major factor affecting the process of corrosion of embedded metals”.

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