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Method for determining concrete structure durability control regions under chlorine salt erosion

A concrete structure and durability technology, which is applied in weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problems of discrete time domain and space domain, large calculation scale, inconvenient use, etc., and achieve small calculation scale, Easy application and high precision results

Active Publication Date: 2013-02-20
GUANGXI UNIV
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Problems solved by technology

Although using conventional numerical methods such as finite elements or commercial general-purpose software, a calculation model is established according to the geometric dimensions of the structural prototype, referred to as the original scale model, it is also possible to determine the diffusion process and concentration distribution of chloride ions in the concrete structure, and on this basis The durability control area of ​​the concrete structure is identified, but this method usually requires double discretization of the time domain and the space domain, resulting in defects such as large calculation scale and time-consuming, which is not easy to adopt in conventional concrete structure design

Method used

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  • Method for determining concrete structure durability control regions under chlorine salt erosion
  • Method for determining concrete structure durability control regions under chlorine salt erosion
  • Method for determining concrete structure durability control regions under chlorine salt erosion

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specific example

[0041] This embodiment is a specific example of the method for determining the durability control area of ​​a certain marine concrete structure, including the following steps:

[0042] 1. Determination of the chloride ion diffusion coefficient D of concrete

[0043] The concrete column of a certain ocean engineering has a geometric dimension of 1m×1m×5m, and its sample specimen is obtained by core drilling. The chloride ion diffusion coefficient of concrete is 3.6×10 -12 m 2 / s=113.5mm 2 / a.

[0044] 2. Determine the typical sites of chloride corrosion in concrete structures

[0045] figure 1 It is a schematic diagram of chloride ion diffusion of the concrete column. Chloride ions in seawater will penetrate into the concrete along the two side elevations and the top surface of the column, and continue to diffuse to the inside. The method of the present invention can be used to divide the concrete column into the non-diffusion area marked as "N" in the figure, the one-dim...

Embodiment 2

[0051] A concrete structure in the design stage has two types of concrete columns, one is a rectangular cross-section, the geometric dimension of the cross-section is 2m×2m, and the height is 5m, such as Figure 6 shown; the other is a polygonal cross-section, the cross-sectional shape is as Figure 7 , where ∠A=∠B=∠D=∠E=α=150°, ∠C=∠F=β=60°, AB=1800mm, and the distance between AB and ED is 1200mm. The upper and lower bottom surfaces of the concrete column are closely connected with other parts of the structure, and only the side of the column is exposed to the environment of chloride ion erosion. The determination of the durability control area of ​​the concrete column includes the following steps:

[0052] 1. Determine the chloride ion diffusion coefficient D of concrete

[0053] According to the concrete design data, the chloride ion diffusion coefficient is determined to be 1.4×10 -12 m 2 / s=44.15mm 2 / a.

[0054] 2. Determine the typical sites of chloride corrosion in...

Embodiment 3

[0064] For the marine concrete structure described in Example 1, the method of the present invention is used to determine the durability control area of ​​the concrete structure, and a corresponding calculation model is formed. On this basis, the finite element method commercial software ANSYS is used to calculate the distribution of chloride ions in the control area. Concentration graphs such as Figure 12 , Figure 13 , Figure 14 shown; and obtain the chloride ion concentration distribution in the one-dimensional control area and the chloride ion concentration distribution on the corner bisector in the two-dimensional and three-dimensional control area, as Figure 15 shown. In order to verify the effectiveness of the inventive method, utilize ANSYS to calculate the isoconcentration diagram of chloride ion distribution in the original scale model of this concrete structure, as Figure 16 , and obtain the chloride ion concentration distribution in the one-dimensional contr...

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Abstract

Disclosed is a method for determining concrete structure durability control regions under chlorine salt erosion. The method includes the following steps of determining a chloride ion diffusion coefficient of concrete; determining a typical part eroded by chlorine salt in a concrete structure; calculating the depth from an exposed surface to the concrete inside intruded by chloride ions; and determining the concrete structure durability control regions under chlorine salt erosion. According to the method, one-dimensional, two-dimensional and three-dimensional diffusion typical areas of the chloride ions in the concentrate structure under chlorine salt erosion can be accurately identified, the durability control regions are determined, a chloride ion diffusion and distribution calculation model is established according to the control regions, problems that calculation is large in scale, long in time consumption and difficult to achieve in conventional personal computers and normal servers due to original size calculation models of concrete structures can be effectively solved, and the method is high in computational accuracy and efficiency.

Description

1. Technical field [0001] The invention relates to the technical field of durability analysis of concrete structures under chloride salt erosion environments such as ocean and deicing salt, in particular to a method for determining the durability control area of ​​concrete structures under chloride salt erosion. 2. Background technology [0002] The durability of concrete structures exposed to chloride salt environment is damaged due to the erosion of chloride ions, which greatly affects the service life of buildings. Accurately obtaining the diffusion and concentration distribution of chloride ions in concrete is the key to analyzing and evaluating the durability and service life of concrete structures under chloride corrosion. [0003] So far, most of the durability analysis and design of concrete structures under chloride corrosion environment adopt technical measures such as improving the performance of concrete and increasing the thickness of concrete protective layer, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N33/38
Inventor 杨绿峰陈正周明洪斌余波蒋琼明
Owner GUANGXI UNIV
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