Reinforcement corrosion expansion stress monitoring device in concrete

A technology of stress monitoring and monitoring devices, which is applied in measuring devices, electromagnetic measuring devices, measuring force, etc., can solve the problems of increased workload, poor efficiency, and high cost, and achieve the effects of low cost, reliable testing, and simple production

Active Publication Date: 2021-01-15
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The damage degree, damage process and repair effect of reinforced concrete are far from enough to be satisfied only by the appearance observation
In addition, if the steel bars in the concrete are damaged due to corrosion and then repaired, it will lead to problems such as increased workload, high cost and poor efficiency.

Method used

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  • Reinforcement corrosion expansion stress monitoring device in concrete
  • Reinforcement corrosion expansion stress monitoring device in concrete
  • Reinforcement corrosion expansion stress monitoring device in concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as Figure 1 to Figure 5 As shown, the inner radius of the thick-wall support 1 is 42mm, the height is 7mm, and the wall thickness is 4mm. The circular column is made of 304 stainless steel, and its outer radius is 40mm, the height is 7mm, the wall thickness is 4mm, and the radius of the platform 8 is 36mm. , the height is 3mm, the wall thickness is 10mm, the length of the foil resistance strain gauge 3 is 55mm, and the width is 4.5mm. Glue-based terminals 7 are bonded to the ends, and insulated wires 6 are connected. Put the stainless steel ring column on the bearing platform 8, the bottom of the ring column and the surface of the bearing platform 8 are bonded with an adhesive, and the gap between the stainless steel ring column and the thick-walled support 1 is sealed with a waterproof sealant. Prevent the concrete from flowing into the gap when the concrete is poured, and the second is to avoid the internal pressure of the external PVC pipe on the resistance st...

Embodiment 2

[0037] The inner radius of the stainless steel ring column is 40mm, the wall thickness is 4mm, the height is 50mm, the tensile strength is ≥ 520MPa, and the diameter of the threaded steel bar is 10mm or 14mm. Mix C50 concrete with seawater, remove the base after 28 days of maintenance, and use the constant voltage method of external power supply to accelerate the corrosion of threaded steel bars. The voltage is 30V, and the current range is 0-5A. The method of connecting with the stabilized DC power supply accelerates the corrosion of threaded steel bars in concrete, and adopts the strain acquisition instrument 4 to collect real-time strain values, and the results are as follows Figure 7 shown.

[0038] Use the electrical acceleration method to accelerate the corrosion of threaded steel bars. When the rust spots accumulate to a certain extent, expansion stress will be generated on the mortar, causing the mortar to expand and deform. Once the mortar is deformed, the expansion ...

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Abstract

The invention relates to a rear-arranged in-concrete reinforcing bar rust expansion strain monitoring device which belongs to the technical field of monitoring equipment. The device comprises a threaded reinforcing bar, a base and at least two sets of sensing units. Each sensing unit comprises a cylindrical column, a resistance strain meter which is arranged on the external surface of the cylindrical column, and a thick wall support arranged outside the cylindrical column. The bottom of the thick wall support is provided with a supporting platform for supporting the cylindrical column. The sensing unit further comprises an insulating lead. The resistance strain meter is connected with the insulating lead. A plurality of sensing units are successively connected and are connected with a strain acquisition instrument through the insulating lead. The bottom of the supporting platform of the thick wall support of a downmost sensing unit is connected with a base. The threaded reinforcing bar is arranged in the cylindrical columns of the plurality of successively connected sensing units and is connected with the base. The rear-arranged in-concrete reinforcing bar rust expansion strain monitoring device has advantages of higher precision, higher reliability and high information volume. The device can directly realize continuous testing for the reinforcing bar rust expansion strain and furthermore realizes long-term and real-time online monitoring to a rusting process and a rust corrosion process of the reinforcing bar in a common concrete structure.

Description

technical field [0001] The invention relates to a post-installed concrete reinforcement rust expansion stress monitoring device, which belongs to the technical field of monitoring equipment. Background technique [0002] In today's society, reinforced concrete has become the most widely used form of building structure in the world, but its durability has increasingly attracted the attention of experts and scholars at home and abroad. Corrosion of steel bars seriously affects the durability of concrete and is the first cause of concrete failure. The main reasons for the corrosion of steel bars in concrete are the intrusion of chloride ions and the carbonization of concrete. When the steel bars in the concrete structure are corroded, the effective cross-section of the steel bars in the concrete will be reduced, which in turn will lead to a decrease in the mechanical properties of the steel bars, and rust expansion will occur between the corroded steel bars and the concrete, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/22G01B7/16
CPCG01B7/18G01L1/2237
Inventor 金祖权范君峰陈永丰康悦曹杰荣
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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