A method for testing the concentration of chloride ions on the surface of cement-based materials

A technology of chloride ion concentration and cement-based materials, which is applied in the direction of material resistance, material capacitance, and analytical materials, can solve the problems of undiscovered chloride ion concentration, etc., and achieve the effect of convenient and fast testing, low cost, and accurate and reliable test results

Active Publication Date: 2021-02-26
LETS HLDG GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] An effective and simple method for testing the concentration of chloride ions on the surface of cement-based materials has not been found so far, so it is necessary to improve this deficiency

Method used

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  • A method for testing the concentration of chloride ions on the surface of cement-based materials
  • A method for testing the concentration of chloride ions on the surface of cement-based materials
  • A method for testing the concentration of chloride ions on the surface of cement-based materials

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Embodiment Construction

[0021] The present invention is further described below in conjunction with specific embodiment:

[0022] As an example, the present embodiment tests the method for the concentration of chloride ions on the surface of cement-based materials, such as Figure 1-4 shown, including the following steps:

[0023] 1) A mold 1 of a certain size is made of insulating plexiglass. The thickness of the plexiglass used in the mold 1 is 3.7mm. The length of the mold 1 is 95.4mm, the width is 47.4mm, and the height is 43.7mm. The interface of the mold 1 is bonded with superglue to ensure that the mold 1 does not leak.

[0024] 2) A square stopper 2 is placed in the middle of the mold 1 to block the shaped concrete. Open a fixing hole with a diameter of 2mm at the midline position on the side of the stopper 2.

[0025] 3) Open a fixing hole with a diameter of 2mm at the center of the side plate of the mold 1, and the fixing hole corresponds to the fixing hole of the stopper 2. An electrod...

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Abstract

The invention discloses a method for testing the concentration of chloride ions on the surface of cement-based materials. Two test pieces arranged at intervals are made through an insulating mold and a baffle, and an internal electrode and an external electrode are arranged on each test piece, and the test piece is solidified. , remove the baffle between the two test pieces, so that the mold and the test piece form a cavity between the test pieces, the test sample is obtained after curing to the specified age under the set conditions, and chlorine is added to the cavity of the test sample Ionic solution, using the AC impedance four-point measurement method to test the AC impedance spectrum of the specimen, and calculate the thickness of the adsorption layer on the surface of the specimen, based on the thickness of the adsorption layer, the concentration of chloride ions in the adsorption layer can be obtained, the The concentration is the chloride ion concentration on the surface of the cement-based material. The invention has the advantages of low cost, convenience and quickness, accurate and reliable test results, and is beneficial to the characteristic evaluation of the chloride ion physical adsorption on the concrete surface, the determination of the chloride ion migration coefficient in the concrete, and the more accurate measurement of the durability of the concrete.

Description

technical field [0001] The invention relates to the field of concrete chloride ion permeability test, in particular to a method for testing the concentration of chloride ions on the surface of cement-based materials. Background technique [0002] In the field of construction, the content of chloride ions in concrete has an important impact on the durability of reinforced concrete structures. Chloride ions have the characteristics of small ionic radius, strong penetrating ability, and strong adsorption by metal surfaces, which will reduce the bluntness of the steel surface. The possibility of the formation of the chemical film may accelerate the destruction of the passive film and promote local corrosion, especially when the concentration ratio of chloride ions to hydroxide ions exceeds the limit, it will cause the passive film of the steel bar to fall off, which will cause the corrosion of the steel bar and lead to the corrosion of the steel bar. Bearing capacity drops and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/07G01N27/22
CPCG01N27/07G01N27/226
Inventor 何富强麻秀星王瑞攀桂苗苗徐仁崇
Owner LETS HLDG GRP CO LTD
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