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Nondestructive testing method for rusting degree of steel bar of reinforced concrete member after rusting cracking

A technology for reinforced concrete and steel bar corrosion, which is applied in the field of non-destructive testing of steel bar corrosion after corrosion and cracking of reinforced concrete members, and can solve problems such as lack of mature non-destructive testing methods, reduced structural applicability, and regional damage

Active Publication Date: 2015-06-24
RES INST OF HIGHWAY MINIST OF TRANSPORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The third stage starts from the cracking of the concrete protective layer. Due to the development of cracks, the applicability of the structure is reduced, the bearing capacity is reduced, or regional damage occurs
[0021] The corrosion of steel bars in reinforced concrete members will have an important impact on the reliability of the members. In the past, the method of detecting the corrosion of steel bars in reinforced concrete members was mainly to use the test method of corrosion current density, which was aimed at the stage before corrosion cracking. For corrosion cracking There is no mature non-destructive testing method for the test of the corrosion degree of steel bars

Method used

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  • Nondestructive testing method for rusting degree of steel bar of reinforced concrete member after rusting cracking
  • Nondestructive testing method for rusting degree of steel bar of reinforced concrete member after rusting cracking
  • Nondestructive testing method for rusting degree of steel bar of reinforced concrete member after rusting cracking

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example 1

[0228] Guardrail part design main reinforcement design stirrups Concrete strength rebound consists of five measurement areas, each measurement area has 16 measurement points, and the concrete carbonation depth has been detected by 2 measurement points. 3, each measuring area contains 6 measuring points, and 3 measuring points in the middle of the component are selected for the crack width. After testing, the average value of concrete strength rebound is 33.2, and the average carbonation depth is 0.46mm. According to the "Technical Regulations for Testing the Compressive Strength of Concrete by Rebound Method" (JGJ / T 23-2011), the converted concrete strength is 27.8Mpa The average thickness of the concrete cover is 28.4mm; the average crack width is 0.22mm; the length of the damaged steel bar is 26.1cm;

[0229] Utilize the calculation formula of the simplified theoretical model built by the present invention and the correction calculation formula of the rust expansion and ...

example 2

[0233] The main reinforcement at the bottom of the box girder is Φ25, the design stirrup is Φ14@180, and there are six measurement areas for concrete strength rebound, with 16 measurement points in each measurement area, and 2 measurement points for the carbonation depth of concrete. They are all arranged in the shape of "品", the number of concrete cover thickness measurement areas is 3, each measurement area contains 6 measurement points, and the crack width is selected from 3 measurement points in the middle of the component. After testing, the average value of concrete strength rebound is 44.0, and the average carbonation depth is 0.15mm. According to the "Technical Regulations for Testing the Compressive Strength of Concrete by Rebound Method" (JGJ / T 23-2011), the converted concrete strength is 50.20Mpa The average thickness of the concrete cover is 25.9mm; the average crack width is 0.17mm; the diameters of the three measuring points are 13.09mm, 13.19mm, and 13.44mm respe...

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Abstract

The invention discloses a nondestructive testing method for the rusting degree of a steel bar of a reinforced concrete member after rusting cracking. The method comprises the following steps: on the basis of mechanics of materials and theoretical mechanics, obtaining a formula (4-49), and measuring the crack width of the reinforced concrete member; if a stirrup is located at a corner part of the reinforced concrete member, calculating the mass of a rusting product according to the formula (4-51) or (4-53) or (4-49); if the stirrup is located in the middle of the reinforced concrete member, calculating according to the formula (4-52) or (4-54) or (4-49); calculating the masses of rusting products at different age periods and different crack widths; and calculating the rusting degree of the steel bar according to the masses of the rusting products, and judging the safety performance of the reinforced concrete member. The formula for nondestructive testing of the rusting degree of the steel bar is deduced on the basis of the mechanics of the materials and the theoretical mechanics. A half-experience and half-theory model disclosed by the invention is based on the theory, and is relatively wide in application range.

Description

technical field [0001] The invention relates to a method for non-destructive detection of the corrosion degree of steel bars after the corrosion and cracking of reinforced concrete members. Background technique [0002] In the concrete structure in the coastal area, the steel bars in the concrete are often corroded to varying degrees due to the corrosion of chloride ions, resulting in rust swelling and cracking along the bars, peeling off of the protective layer, and exposed steel bars. The loss of steel bar section in corroded components, the decline in the mechanical properties of steel bars, and the decrease in the cooperative performance of steel bars and concrete will directly affect the usability and safety of the structure. [0003] Existing evaluation standards consider that the durable life of the concrete protective layer will end once it cracks. However, a large number of studies have shown that at the initial stage of rust swelling and cracking of the concrete c...

Claims

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Application Information

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IPC IPC(8): G01N33/20
Inventor 赵尚传曹健
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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