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Reinforced concrete sample and preparation method and application thereof

A reinforced concrete and concrete technology, applied in the preparation of test samples, measuring devices, instruments, etc., can solve the problems of long cycle time

Pending Publication Date: 2020-10-20
宿迁市河海大学研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under normal conditions, the corrosion of steel bars in concrete is a long-term problem, and the period used to study the corrosion of steel bars with ordinary reinforced concrete test blocks is long.

Method used

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  • Reinforced concrete sample and preparation method and application thereof
  • Reinforced concrete sample and preparation method and application thereof
  • Reinforced concrete sample and preparation method and application thereof

Examples

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preparation example Construction

[0034] The present invention also provides the preparation method of the reinforced concrete sample described in above-mentioned technical scheme, comprises the following steps:

[0035] Grinding the stainless steel plate to obtain the polished stainless steel plate; fixing the steel rod to be corroded and the PVC pipe on the polished stainless steel plate to obtain a mold; the steel rod to be corroded is located at the center of the PVC pipe, and the to-be-corroded There is a gap between the corroded steel rod and the inner wall of the PVC pipe; the length of the steel rod to be corroded is greater than the length of the PVC pipe;

[0036] Applying silicone oil on the inner wall of the PVC pipe of the mold, pouring concrete into the gap between the steel rod to be corroded and the inner wall of the PVC pipe to obtain a grouting mold;

[0037] After the grouting mold is cured, it is removed from the mold, a copper wire is wound on the exposed part of the steel rod to be corrod...

Embodiment 1

[0064] The size parameters are 5mm in diameter, 50mm in length, and the surface of the steel rod to be corroded is mechanically polished to a smooth surface, and the bottom of the PVC pipe is bonded to the stainless steel plate to ensure that the steel rod to be corroded is at the center of the bottom circle of the PVC pipe and evenly inside the PVC pipe. Apply a layer of silicone oil, and then pour the concrete with a water-cement ratio of 0.6 and a lime-sand ratio of 1:3 (the cement is ordinary C20 cement, and the sand is quartz sand with a fineness modulus of 1.7 to 2.2) that is fully mixed and uniform. Corrode the middle part of the steel rod and the inner wall of the PVC pipe, use a small rod to tamp the concrete in the mold, let it stand for 2 days and then take off the PVC pipe, tie the exposed part of the steel rod to be corroded with copper wire (the number of winding turns of the copper wire is 5 turns) , the bottom concrete part and the top exposed steel part are sea...

Embodiment 2

[0067] The size parameters are 5mm in diameter, 50mm in length, and the surface of the steel rod to be corroded is mechanically polished to a smooth surface, and the bottom of the PVC pipe is bonded to the stainless steel plate. Try to ensure that the steel rod to be corroded is at the center of the bottom circle of the PVC pipe and inside the PVC pipe. Apply a layer of silicone oil evenly, and then pour the concrete (the cement is ordinary C20 cement, and the sand is quartz sand with a fineness modulus of 1.7 to 2.2) with a water-cement ratio of 0.6 and a lime-sand ratio of 1:3. For the middle part between the steel rod to be corroded and the inner wall of the PVC pipe, use a small rod to tamp the concrete in the mold, let it stand for 2 days and then take off the PVC pipe, and bind the exposed part of the steel rod to be corroded with a copper wire (the number of winding turns of the copper wire is 5 turns) ), the bottom concrete part and the top exposed steel part are sealed...

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Abstract

The invention provides a reinforced concrete sample and a preparation method and application thereof, and belongs to the technical field of preparation of concrete detection samples. The reinforced concrete sample provided by the invention comprises a to-be-corroded steel bar and a concrete layer wrapping the to-be-corroded steel bar. The copper wire is wound on the to-be-corroded steel bar of thereinforced concrete sample, the copper wire can be electrified in the later period, corrosion of the sample is accelerated, and the corrosion time is shortened; meanwhile, the performance of a corrosion product obtained by electrifying to accelerate corrosion is close to that of a long-period steel bar corrosion product in the natural environment, and the corrosion product can be used for reference research of researchers to solve the actual use problem. In addition, the reinforced concrete provided by the invention can also be subjected to a salt mist dry-wet cycle corrosion test, the corrosion process of the reinforced concrete in a marine environment is simulated, and corrosion of steel bars in the concrete is accelerated. In addition, epoxy resin sealing can guarantee that the copperwire port is not corroded, and the later-period use effect is guaranteed.

Description

technical field [0001] The invention relates to the technical field of preparation of concrete testing samples, in particular to a reinforced concrete sample and its preparation method and application. Background technique [0002] From the perspective of prolonging the life of reinforced concrete members, the corrosion of steel bars is the internal cause of the damage of concrete members. The corrosion of steel bars is the most important factor affecting the durability of concrete structures. After the steel bars are corroded, the volume of the corrosion products produced is 2 to 6 times the volume of the corroded iron, which will generate a large rust expansion force and cause the concrete protective layer to crack. , so that the durability of concrete components decreased. [0003] Therefore, researchers observe and study the corrosion mechanism of corrosion-resistant alloy steel bars and the corrosion morphology of their corrosion products, and start from the internal c...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N17/00
CPCG01N1/28G01N17/006G01N17/00G01N17/002
Inventor 宋丹郝俊禚孝儒邱超李玉华江静华马爱斌
Owner 宿迁市河海大学研究院
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