CN110779859A - Auxiliary device and method for detecting corrosion resistance of steel bar under pure bending action - Google Patents
Auxiliary device and method for detecting corrosion resistance of steel bar under pure bending action Download PDFInfo
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- CN110779859A CN110779859A CN201910976492.0A CN201910976492A CN110779859A CN 110779859 A CN110779859 A CN 110779859A CN 201910976492 A CN201910976492 A CN 201910976492A CN 110779859 A CN110779859 A CN 110779859A
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- loading
- test piece
- steel bar
- corrosion resistance
- crystal display
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/22—Investigating strength properties of solid materials by application of mechanical stress by applying steady torsional forces
Abstract
The invention discloses an auxiliary device and a method for detecting the corrosion resistance of a steel bar under the pure bending action, wherein the auxiliary device comprises a container and a loading device in the container, erosion simulation liquid is filled in the container, the loading device in the container is connected with the container through a fixed base and is immersed in the erosion simulation liquid, the loading device comprises a fixed base, a loading knob, a spiral vertical supporting rod, a ball type torque eliminator, an embedded liquid crystal display force measurer, a loading part and a loading groove, the embedded liquid crystal display force measurer is embedded between the loading part and the ball type torque eliminator, a test piece fixing clamp opening is arranged on the loading groove and is used for fixing a test piece, and the loading part loads the test piece through two action points under the action of the loading knob below to provide uniform bending moment. The auxiliary device can provide uniform bending moment for the exposed part of the reinforcing steel bar, has no shear interference, can display the stress value in real time and accurately in the using process, and has the advantages of convenient use, simple operation and wide application prospect.
Description
Technical Field
The invention belongs to the technical field of material performance tests, and particularly relates to an auxiliary device and method for detecting corrosion resistance of a steel bar under the pure bending action.
Background
The corrosion of steel bars is the most important factor causing the reduction of the durability of the concrete structure, and the corrosion of chloride salt is the main cause of the corrosion of steel bars. A number of early concrete structures have degraded under age, leading to premature failure of the structure, resulting in significant direct and indirect losses. At present, China is in the peak period of infrastructure construction and maintenance, and is the area with the most reinforced concrete structures in the world. Under the background, the detection of the corrosion resistance of the steel bars has very important and profound significance for improving the durability of the reinforced concrete and the service life of the reinforced concrete structure.
The tensile strength of the concrete is low, so the concrete can be added with the reinforcing steel bars to work together, the reinforcing steel bars bear the tensile force, and the concrete bears the pressure. In actual engineering, the stress condition of the steel bar is very complex, and the steel bar can bear loads such as bending moment, shearing force, pulling force and the like and simultaneously acts. Under the action of loads such as bending moment and the like, the anti-corrosion performance of the steel bar is influenced, so that the structural durability of the reinforced concrete is influenced. At present, no report exists on the research of the corrosion resistance of the steel bar under the action of uniform bending moment and no shearing force.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the auxiliary device and the method for detecting the corrosion resistance of the steel bar under the pure bending action, fills the blank of the detection of the corrosion resistance of the steel bar under the pure bending action in the field of civil engineering materials, and can provide accurate single variable, namely uniform bending moment, for the steel bar test piece in the electrochemical corrosion test.
The invention is realized by the following technical scheme:
an auxiliary device for detecting the corrosion resistance of a steel bar under the pure bending action comprises a container and a loading device fixed in the container, wherein the loading device comprises a fixed base, a loading knob, a spiral vertical supporting rod, a ball type torque eliminator, an embedded liquid crystal display dynamometer, a loading part and a loading groove, and the loading device is fixed at the bottom of the container through the fixed base;
the test piece fixing clamp comprises a fixing base, a test piece fixing clamp opening, a test piece clamping groove and a clamping groove, wherein the fixing base is provided with a loading groove, the wall of the groove is provided with a test piece fixing clamp opening, and the bottom of the groove is provided with a threaded hole;
the side surface of the spiral vertical supporting rod is provided with threads, and the spiral vertical supporting rod can move up and down spirally at the bottom of the spiral vertical supporting rod through a threaded hole at the bottom of the loading groove; the upper end of the spiral vertical strut is sequentially provided with a ball type torque eliminator and a loading part from bottom to top, and the embedded liquid crystal display dynamometer is integrally embedded between the ball type torque eliminator and the loading part; the lower end of the spiral vertical supporting rod is connected with a loading knob;
erosion simulation liquid is filled in the container, and the loading device is immersed in the erosion simulation liquid.
Preferably, a glass bead and a glass slide rail are arranged in the ball type torque eliminator, wherein the glass bead is uniformly distributed in the glass slide rail and can roll in the glass slide rail.
Preferably, the loading part comprises a cross rod and two stress tips, wherein the two stress tips are fixed on the upper parts of the two ends of the cross rod respectively and can be in contact with the test piece.
Preferably, the embedded liquid crystal display force measuring device comprises a liquid crystal display screen, a strain gauge, a lead and a pressure sensor, wherein the liquid crystal display screen is arranged on the upper surface of the cross bar; the pressure sensor is connected with the strain gauge through a lead and displays the stress value through the liquid crystal display screen.
A method for detecting the corrosion resistance of a steel bar under the pure bending action comprises the following steps:
step 1) treatment of the test piece: coating a layer of epoxy resin on the surface of the test piece, sealing the test piece by using a soft rubber layer to form a sealing coating, and arranging an exposed area in the middle of the test piece;
step 2) loading load: fixing the test piece processed in the step 1) at a test piece fixing clamp of a loading groove, rotating a loading knob to drive a spiral vertical supporting rod to move upwards, enabling two stress tips of a loading part to contact the test piece above the loading part, continuing to rotate to apply load to the test piece, enabling an exposed area in the middle of the test piece to be subjected to a measurable uniform bending moment load, and reading an embedded liquid crystal display dynamometer to obtain an applied uniform bending moment load value;
step 3) set comparative example: the loading knob is adjusted to give different uniform bending moment loads to the test piece, so that a contrast test is formed.
Preferably, the length of the exposed area in the step 1) is 1-1.5 cm, and the width of the exposed area is 0.8-1 cm.
The invention has the following beneficial effects:
the auxiliary device provided by the invention adopts the adjustable loading knob to provide bending moment for the test piece, and then the bending moment applied to the exposed part of the test piece is uniform under the action of the two stress tips, so that no shear interference exists, and the trouble that the stress of an experimental research object is complex is effectively avoided. The embedded liquid crystal display dynamometer in the device can measure the stress value data instantly and accurately, avoids stress measurement errors to a certain extent, and ensures the measurement accuracy. The ball type torque eliminator in the device can effectively eliminate the torque effect of the loading knob on the test piece. The auxiliary device is different from a common loading testing machine, can provide single variable for subsequent experiments, is simple to operate, convenient to use, good in adjustability and recyclable, can be used in cooperation with an electrochemical workstation, and has good practicability when the corrosion resistance of the steel bar is detected under the pure bending action.
Drawings
FIG. 1 is a schematic view of the overall structure of the auxiliary device of the present invention;
FIG. 2 is a top view of the overall structure of the auxiliary device of the present invention;
in fig. 3: FIG. 3-a is a schematic diagram of the overall structure of the loading knob, the spiral vertical strut, the ball type torque eliminator, the embedded LCD force measuring device and the loading unit in the loading device; FIG. 3-b is a schematic diagram of a ball type torque canceller; FIG. 3-c is a schematic diagram of the structure of the embedded LCD force-measuring device; FIG. 3-d is a schematic view of the structure of the force-receiving tip in the loading member;
FIG. 4 is a partial schematic view of a specimen-holding clamp on the loading slot wall;
in the figure: 1. a container; 2. erosion simulation liquid; 3. a fixed base; 4. a loading tank; 5. a loading knob; 6. a spiral vertical strut; 7. a ball type torque canceller; 8. a loading member; 9. an embedded liquid crystal display dynamometer; 10. a test piece; 11. a seal coat; 12. an exposed region; 13. a test piece fixing clamp opening; 14. enamelling the wires; 15. a thread; 16. a cross bar; 17. a stressed tip; 18. glass beads; 19. a glass slide rail; 20. a strain gauge; 21. a wire; 22. a pressure sensor; 23. a threaded hole; 24. and a liquid crystal display screen.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and with reference to the following drawings.
Example 1
An auxiliary device for detecting the corrosion resistance of a steel bar under the pure bending action comprises a container 1 and a loading device fixed in the container 1, wherein the loading device comprises a fixed base 3, a loading knob 5, a spiral vertical supporting rod 6, a ball type torque eliminator 7, an embedded liquid crystal display dynamometer 9, a loading part 8 and a loading groove 4. The container 1 is filled with erosion simulation liquid 2, and the loading device is immersed in the erosion simulation liquid 2.
As shown in fig. 2, the fixing bases 3 are strip-shaped structures and are located at two sides of the bottom of the container 1, so that the loading device is kept stable in the erosion simulation liquid 2, namely, the fixing bases are used for fixing the loading device.
As shown in fig. 1, a loading slot 4 is arranged on the fixed base 3, a test piece fixing clamp opening 13 is arranged on the slot wall of the loading slot 4, and a threaded hole 23 is arranged at the slot bottom of the loading slot 4.
As shown in fig. 3-a, the side surface of the spiral vertical strut 6 is provided with a thread 15, and the thread can move up and down spirally at the bottom of the spiral vertical strut through a threaded hole 23 at the bottom of the loading groove 4, so that the loading part 8 at the upper end is pushed to apply uniform bending moment to the test piece 10; the upper end of the spiral vertical strut 6 is sequentially provided with a ball type torque eliminator 7 and a loading part 8 from bottom to top, and the embedded liquid crystal display dynamometer 9 is integrally embedded between the ball type torque eliminator 7 and the loading part 8; the lower end of the spiral vertical strut 6 is connected with the loading knob 5.
As shown in fig. 3-a, the loading part 8 comprises a cross bar 16 and two stressed tips 17, wherein the two stressed tips 17 are respectively fixed on the upper parts of the two ends of the cross bar 16; as shown in fig. 3-d, the middle line segment represents the tip portion of the force-receiving tip 17, and the force-receiving tip 17 may be in contact with the test piece 10.
As shown in fig. 3-b, the ball type torque canceller 7 is provided with glass beads 18 and glass slide rails 19, wherein the glass beads 18 are uniformly distributed in the glass slide rails 19, and when the loading knob 5 below is rotated, the glass beads 18 roll in the glass slide rails 19, so that the components above the glass beads 18 do not rotate along with the loading knob, and the loading component 8 does not generate torque on the test piece 10 when a load is applied on the test piece 10.
As shown in fig. 3-a, 3-c, the embedded lcd force-measuring device 9 includes an lcd 24, a strain gauge 20, a wire 21 and a pressure sensor 22, which are integrally embedded between the ball type torque canceller 7 and the loading part 8; wherein, the liquid crystal display screen 24 is arranged on the upper surface of the transverse rod 16; the pressure sensor 22 is connected to the strain gauge 20 through a wire 21 and displays the stress value through a liquid crystal display 24.
The structure of the specimen fixing nip 13 is shown in fig. 4, and the specimen 10 is fixedly mounted in the specimen fixing nip 13.
Example 2
A method for detecting the corrosion resistance of a steel bar under the pure bending action comprises the following specific steps:
(1) treatment of the test piece: as shown in fig. 1, a layer of epoxy resin is wrapped on the surface of a test piece 10, a sealing coating 11 is formed through sealing treatment of a soft adhesive layer, an exposed area 12 is arranged in the middle of the test piece 10, the length of the exposed area 12 is 1-1.5 cm, and the width of the exposed area 12 is 0.8-1 cm; an enameled wire 14 is welded to one end of the test piece 10, and the exposed metal part of the enameled wire 14 is wrapped in the seal coating 11.
(2) Loading a load: fixing the treated test piece 10 at a test piece fixing clamp opening 13 of the loading groove 4, rotating the loading knob 5 again to drive the spiral vertical supporting rod 6 to move upwards, enabling two stress tips 17 of the loading part 8 to contact the test piece 10 above the loading part, continuing to rotate to apply load to the test piece 10, enabling an exposure area 12 in the middle of the test piece 10 to be subjected to measurable uniform bending moment load, and reading the embedded liquid crystal display dynamometer 9 to obtain an applied uniform bending moment load value.
(3) Setting a comparative example: the comparative test is made by adjusting the loading knob 5 to give the test piece 10 different uniform moment loads.
The device of the invention is an auxiliary device, so that the enameled wire 14 can be connected to an electrochemical workstation, and an electrochemical test for detecting the corrosion resistance of the steel bar under the pure bending action can be carried out.
The above-described embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and all alternatives, modifications, and simplifications may be made without departing from the spirit or scope of the present invention as defined by the appended claims.
Claims (6)
1. An auxiliary device for detecting the corrosion resistance of a steel bar under the pure bending action is characterized by comprising a container and a loading device fixed in the container, wherein the loading device comprises a fixed base, a loading knob, a spiral vertical supporting rod, a ball type torque eliminator, an embedded liquid crystal display dynamometer, a loading part and a loading groove, and the loading device is fixed at the bottom of the container through the fixed base;
the test piece fixing clamp comprises a fixing base, a test piece fixing clamp opening, a test piece clamping groove and a clamping groove, wherein the fixing base is provided with a loading groove, the wall of the groove is provided with a test piece fixing clamp opening, and the bottom of the groove is provided with a threaded hole;
the side surface of the spiral vertical supporting rod is provided with threads, and the spiral vertical supporting rod can move up and down spirally at the bottom of the spiral vertical supporting rod through a threaded hole at the bottom of the loading groove; the upper end of the spiral vertical strut is sequentially provided with a ball type torque eliminator and a loading part from bottom to top, and the embedded liquid crystal display dynamometer is integrally embedded between the ball type torque eliminator and the loading part; the lower end of the spiral vertical supporting rod is connected with a loading knob;
erosion simulation liquid is filled in the container, and the loading device is immersed in the erosion simulation liquid.
2. The auxiliary device for detecting the corrosion resistance of the steel bar under the pure bending action according to claim 1, wherein a glass bead and a glass slide rail are arranged in the ball type torque eliminator, wherein the glass bead is uniformly distributed in the glass slide rail and can roll in the glass slide rail.
3. The auxiliary device for detecting the corrosion resistance of the steel bar under the pure bending action according to claim 1, wherein the loading component comprises a cross bar and two stress tips, wherein the two stress tips are respectively fixed on the upper parts of the two ends of the cross bar and can be in contact with a test piece.
4. The auxiliary device for detecting the corrosion resistance of the steel bar under the pure bending action as claimed in claim 3, wherein the embedded liquid crystal display force measuring device comprises a liquid crystal display screen, a strain gauge, a lead and a pressure sensor, wherein the liquid crystal display screen is arranged on the upper surface of the cross bar; the pressure sensor is connected with the strain gauge through a lead and displays the stress value through the liquid crystal display screen.
5. The method for detecting the corrosion resistance of the steel bar under the pure bending action based on the auxiliary device for detecting the corrosion resistance of the steel bar under the pure bending action of claim 1 is characterized by comprising the following steps of:
step 1) treatment of the test piece: coating a layer of epoxy resin on the surface of the test piece, sealing the test piece by using a soft rubber layer to form a sealing coating, and arranging an exposed area in the middle of the test piece;
step 2) loading load: fixing the test piece processed in the step 1) at a test piece fixing clamp of a loading groove, rotating a loading knob to drive a spiral vertical supporting rod to move upwards, enabling two stress tips of a loading part to contact the test piece above the loading part, continuing to rotate to apply load to the test piece, enabling an exposed area in the middle of the test piece to be subjected to a measurable uniform bending moment load, and reading an embedded liquid crystal display dynamometer to obtain an applied uniform bending moment load value;
step 3) set comparative example: the loading knob is adjusted to give different uniform bending moment loads to the test piece, so that a contrast test is formed.
6. The method for detecting the corrosion resistance of the steel bar under the pure bending action according to claim 5, wherein the length of the exposed area in the step 1) is 1-1.5 cm, and the width of the exposed area is 0.8-1 cm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910976492.0A CN110779859A (en) | 2019-10-15 | 2019-10-15 | Auxiliary device and method for detecting corrosion resistance of steel bar under pure bending action |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910976492.0A CN110779859A (en) | 2019-10-15 | 2019-10-15 | Auxiliary device and method for detecting corrosion resistance of steel bar under pure bending action |
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| CN110779859A true CN110779859A (en) | 2020-02-11 |
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| CN201910976492.0A Pending CN110779859A (en) | 2019-10-15 | 2019-10-15 | Auxiliary device and method for detecting corrosion resistance of steel bar under pure bending action |
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Citations (7)
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|---|---|---|---|---|
| CN1036264A (en) * | 1988-03-25 | 1989-10-11 | 北京科技大学 | Semiconductor devices outer lead anticorrosion stress-resistant detection method |
| JPH01285856A (en) * | 1988-05-12 | 1989-11-16 | Toshiba Ceramics Co Ltd | Method for evaluation test of checker refractory |
| JP2008051632A (en) * | 2006-08-24 | 2008-03-06 | Toshiba Corp | Test method of stress corrosion crack development and testing equipment therefor |
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| CN103698267A (en) * | 2013-12-31 | 2014-04-02 | 沈阳建筑大学 | Device and method for studying performance of steel pipe concrete bending member under load and corrosion conditions |
| CN106769414A (en) * | 2017-01-04 | 2017-05-31 | 湖北工业大学 | Load and test specimen durability test device under environment coupled action |
| CN108548773A (en) * | 2018-03-30 | 2018-09-18 | 河海大学 | Detect the auxiliary device and its application method of reinforcing bar stainless property under by curved state |
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2019
- 2019-10-15 CN CN201910976492.0A patent/CN110779859A/en active Pending
Patent Citations (7)
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| CN1036264A (en) * | 1988-03-25 | 1989-10-11 | 北京科技大学 | Semiconductor devices outer lead anticorrosion stress-resistant detection method |
| JPH01285856A (en) * | 1988-05-12 | 1989-11-16 | Toshiba Ceramics Co Ltd | Method for evaluation test of checker refractory |
| JP2008051632A (en) * | 2006-08-24 | 2008-03-06 | Toshiba Corp | Test method of stress corrosion crack development and testing equipment therefor |
| CN202057572U (en) * | 2011-03-15 | 2011-11-30 | 中国船舶重工集团公司第七二五研究所 | Simple corrosion device used for low-cycle fatigue test |
| CN103698267A (en) * | 2013-12-31 | 2014-04-02 | 沈阳建筑大学 | Device and method for studying performance of steel pipe concrete bending member under load and corrosion conditions |
| CN106769414A (en) * | 2017-01-04 | 2017-05-31 | 湖北工业大学 | Load and test specimen durability test device under environment coupled action |
| CN108548773A (en) * | 2018-03-30 | 2018-09-18 | 河海大学 | Detect the auxiliary device and its application method of reinforcing bar stainless property under by curved state |
Non-Patent Citations (1)
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