Detection method of erosion depth of free so42- ions on concrete surface

A technology of concrete surface and erosion depth, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve problems such as difficulty in accurately observing and judging erosion depth, and achieve convenient judgment. Accurate, color rendering effect is obvious, the effect of accelerating the reaction

Inactive Publication Date: 2016-08-17
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] External SO 4 2- When corroding concrete, SO 4 2- Erosion depth is usually used BaCl 2 detection, but due to its detection BaCl 2 with free SO 4 2- The reaction produces white BaSO 4 The color is similar to the gray-white base of concrete, so it is difficult to accurately observe and judge the erosion depth

Method used

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  • Detection method of erosion depth of free so42- ions on concrete surface
  • Detection method of erosion depth of free so42- ions on concrete surface

Examples

Experimental program
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Effect test

Embodiment 1

[0017] PO42.5 ordinary Portland cement 450g; standard sand 1350g; water 225g. The water-cement ratio is 0.5. After mixing cement and standard sand evenly, add water and stir, pour into a mold of 40mm×40mm×160mm, and standardize for 28 days. Then the mass fraction is transferred to 5%Na 2 SO 4 After soaking in the solution, the mortar test block was taken out after 28 days, and the concrete test block was split mechanically to obtain a fresh flat section (100mm×100mm). Immerse the fresh section of concrete into the fresh suspension solution of barium roseate, and keep it in an incubator at 60°C for 1 hour. Use a straightedge to measure the distance between the boundary line of the concrete section color (dark red and white) and the edge of the test block to be 3.0mm.

[0018] The cement mortar with the above mix ratio was soaked for 28 days and then tested for SO by conventional methods. 4 2- Penetration depth, grind and cut the cement mortar from the eroded surface to th...

Embodiment 2

[0020] PO42.5 ordinary portland cement 2.19kg; sand 2.84kg; gravel 5.76kg; water 0.96kg. The water-cement ratio is 0.44. Mix cement: sand: gravel evenly, add water and stir, pour into a mold of 100mm×100mm×400mm, after standard curing for 28 days, then add 5% Na 2 SO 4 Soak in the solution. Take it out after 90 days, and mechanically split the concrete to produce a fresh flat section (100mm×100mm). Immerse the fresh section of concrete into the fresh suspension solution of barium roseate, and keep it warm in an incubator at 55°C for 1.5h. Use a ruler to measure the distance between the boundary line of the concrete section color (dark red and white) and the edge of the test block to be 11.3mm, which is the SO value of the sample to be tested. 4 2- The ion penetration depth is 11.3mm.

Embodiment 3

[0022] PO42.5 ordinary portland cement 2.19kg; sand 2.84kg; gravel 5.76kg; water 0.96kg. The water-cement ratio is 0.44. Mix cement: sand: gravel evenly, add water and stir, cast in a mold of 100mm×100mm×400mm, and put in 5% Na 2 SO 4 Soak in the solution, take it out after 180 days, and mechanically split the concrete to produce a fresh flat section (100mm×100mm). Immerse the fresh section of concrete into the fresh barium roseate suspension solution, and keep it warm in an incubator at 50°C for 2 hours. Use a straightedge to measure the distance between the boundary line of the concrete section color (dark red and white) and the edge of the test block, and free SO in the concrete can be detected 4 2- Erosion depth, its depth detection is 21.0mm.

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Abstract

The invention relates to a kind of concrete surface free SO 4 2‑ Detection method of ion erosion depth. This method is used when the concrete is subjected to external SO 4 2‑ In the case of penetrating erosion, use a special color developer to develop color on the concrete section, and use the color difference to judge the depth of sulfate attack in the concrete. The color development principle of the color developer is through the red precipitation of barium roseate and free SO in concrete 4 2‑ undergoes a displacement reaction to form white BaSO 4 Precipitation, in the concrete section (with SO 4 2‑ A color dividing line appears on the same erosion direction). The advantage of this method is that it is simple and easy to operate, the reaction phenomenon is obvious, and the color boundary formed can be maintained for a long time. It can be used not only for laboratory testing but also for external SO in concrete in engineering use. 4 2‑ On-site detection of penetration depth.

Description

technical field [0001] The invention relates to a kind of concrete surface free SO 4 2- The invention discloses a detection method for ion erosion depth, which belongs to the technical field of building materials. Background technique [0002] External SO 4 2- When corroding concrete, SO 4 2- Erosion depth is usually used BaCl 2 detection, but due to its detection BaCl 2 with free SO 4 2- The reaction produces white BaSO 4 It is similar to the off-white base color of concrete, so it is difficult to accurately observe and judge the erosion depth. Contents of the invention [0003] The purpose of the present invention is to address the problems referred to above, and proposes a kind of concrete surface free SO 4 2- Detection method of ion erosion depth. [0004] Technical scheme of the present invention: the present invention passes the red precipitation of barium roseate and free SO in concrete 4 2- undergoes a displacement reaction to form white BaSO 4 Prec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 潘志华王学兵
Owner NANJING TECH UNIV
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