CN117819857B - Rust prevention method for steel fibers - Google Patents
Rust prevention method for steel fibers Download PDFInfo
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- CN117819857B CN117819857B CN202410072117.4A CN202410072117A CN117819857B CN 117819857 B CN117819857 B CN 117819857B CN 202410072117 A CN202410072117 A CN 202410072117A CN 117819857 B CN117819857 B CN 117819857B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 186
- 239000010959 steel Substances 0.000 title claims abstract description 186
- 239000000835 fiber Substances 0.000 title claims abstract description 174
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000002265 prevention Effects 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 93
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000005507 spraying Methods 0.000 claims abstract description 21
- 230000000694 effects Effects 0.000 claims abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052802 copper Inorganic materials 0.000 claims abstract description 14
- 239000010949 copper Substances 0.000 claims abstract description 14
- 238000007590 electrostatic spraying Methods 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 8
- 238000000889 atomisation Methods 0.000 claims abstract description 7
- 238000009713 electroplating Methods 0.000 claims abstract description 7
- 230000007797 corrosion Effects 0.000 claims abstract description 5
- 238000005260 corrosion Methods 0.000 claims abstract description 5
- 239000003822 epoxy resin Substances 0.000 claims abstract description 5
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 5
- 239000003755 preservative agent Substances 0.000 claims abstract description 5
- 230000002335 preservative effect Effects 0.000 claims abstract description 5
- 238000010276 construction Methods 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 26
- 230000007547 defect Effects 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 9
- 229920002120 photoresistant polymer Polymers 0.000 claims description 9
- 238000004381 surface treatment Methods 0.000 claims description 9
- 230000007847 structural defect Effects 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 239000011241 protective layer Substances 0.000 claims description 4
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 claims description 3
- 239000003963 antioxidant agent Substances 0.000 claims description 3
- 230000003078 antioxidant effect Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 229910001431 copper ion Inorganic materials 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 238000002161 passivation Methods 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000000197 pyrolysis Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to an antirust method for steel fibers in the field of steel fiber rust prevention, which comprises the following steps: firstly, performing rust prevention on the surface of steel fiber through an epoxy resin preservative, then electroplating a copper film on a rust prevention base layer, performing electrostatic spraying through graphite powder, performing atomization spraying through pyrolytic rubber powder after the electrostatic spraying, and finally, performing drying treatment on the steel fiber to form pyrolytic rubber; then the steel fiber is applied to construct a concrete structure; after construction, the detection equipment is used for detecting the corrosion of the concrete structure regularly, so that the steel fiber has a good self rust-proof effect, and when the rust-proof measures of the steel fiber are damaged, the detection equipment can rapidly detect whether the rust-proof inner layer fails, so that whether the surrounding environment of the steel fiber is abnormal or not is judged, and further the steel fiber can be found out in time before the complete rust-proof effect of the steel fiber in the concrete structure fails, so that the concrete structure and the steel fiber can be maintained in time.
Description
Technical Field
The invention relates to a rust prevention method of steel fibers, in particular to a rust prevention method of steel fibers, which is applied to the field of rust prevention of steel fibers.
Background
The application field of the steel fiber is very wide. In industrial floors, such as logistics, refrigeration houses, outdoors, storage and the like, steel fiber concrete is widely used to reinforce and improve cracking.
In addition, in the road surface engineering, the steel fiber concrete has the characteristics of high bending strength, crack resistance, fatigue resistance, wear resistance, good shock resistance and the like, so that the steel fiber concrete can replace steel bars, reduce the thickness of the road surface, enlarge the gap between shrinkage joints, shorten the construction period, improve the engineering quality, reduce the engineering maintenance cost and prolong the engineering service life.
In order to solve the problem that steel fibers are easy to corrode, a certain steel fiber in the market adopts a design of coating an anti-rust coating, and has a certain market ratio.
The specification of Chinese patent No. 103739231A discloses a preparation method of steel fiber with self-rust-preventing function for concrete; according to the invention, the rust-resistant component is adsorbed on the surface of the steel fiber and a compact hydrophobic protective film is formed, so that the steel fiber has a good corrosion-resistant effect in the atmosphere, a good self rust-resistant function can be shown in concrete polluted by chloride, and the formed protective film does not influence the binding force of the steel fiber and the concrete, so that the reinforcing and cracking-resistant effects of the steel fiber on the concrete are not influenced.
The prior steel fiber has a certain rust prevention effect, but because the rust prevention layer on the steel fiber is generally thinner, especially when the steel fiber concrete is exposed in environments containing chloride ions, such as seawater, sewage and snow water, penetrating into the concrete structure, the chloride ions can penetrate into the surface of the steel fiber to reduce the pH value of the steel fiber, so that the rust prevention layer is damaged, the chemical reaction is accelerated, the rust of the steel fiber is easily initiated, the stability of the concrete structure is easily affected after a large amount of steel fiber in the concrete structure is corroded, the structural safety is further affected, and no proper treatment method exists when the rust prevention layer on the steel fiber fails in the rust prevention technology of the prior steel fiber.
Disclosure of Invention
Aiming at the prior art, the invention aims to solve the technical problem that no proper treatment method exists when the rust-proof layer on the steel fiber fails in the current rust-proof technology of the steel fiber.
In order to solve the problems, the invention provides an anti-rust method for steel fibers, which specifically comprises the following steps:
A, rust prevention treatment of the surface of steel fiber;
a1, preprocessing, namely cleaning and drying steel fibers;
A2, then, arranging an antirust layer on the surface of the steel fiber;
A21, preparing an antirust base layer, soaking steel fibers in an epoxy resin preservative for 30-90 minutes, taking out the steel fibers, draining, and finally drying and solidifying to form a compact protective layer on the steel fibers;
A22, preparing an antirust inner layer; cleaning the steel fiber obtained in the last step, spraying a surfactant on the steel fiber, immersing the pretreated steel fiber into an electroplating solution containing copper ions, and electroplating by applying current to form a copper film on the antirust substrate;
A23, preparing an outer layer; surface treatment; carrying out electrostatic spraying by using graphite powder, obtaining steel fibers covered by the graphite powder after the electrostatic spraying, and then carrying out atomization spraying on the steel fibers by using pyrolytic photoresist powder to cover the surfaces of the steel fibers by pyrolytic photoresist; heating the steel fiber to 70-90 ℃ during spraying; after the spraying is finished, the steel fibers are cooled.
A3, drying the steel fibers to form pyrolytic glue;
b, applying the steel fiber, mixing the steel fiber with concrete, and then building a structure to obtain a concrete structure;
C, rust detection, namely detecting the concrete structure of the previous step periodically, wherein detection equipment is used for detecting the concrete structure using the steel fibers during detection; judging whether the rust-proof effect of the steel fiber in the concrete structure fails according to the detection result.
In the rust prevention method of the steel fiber, the steel fiber can obtain a better self rust prevention effect, and on the other hand, when the rust prevention measure of the steel fiber in the concrete structure fails, the arrangement of the rust prevention inner layer can facilitate detection by detection equipment.
As a further improvement of the present application, the steel fiber includes fiber steel wires with an aspect ratio of 40-80, which are produced by a fine steel wire cutting method, a cold-rolled steel strip shearing method, a steel ingot milling method and a molten steel rapid condensation method, and the length of the steel fiber is 40-60 mm.
As a still further improvement of the present application, the rust inhibitive inner layer is subjected to a surface treatment after being prepared, and the surface treatment means includes a passivation treatment and an antioxidant coating.
As a further improvement of the application, 50-100 meshes of graphite powder is used for spraying during electrostatic spraying, and 10-40 meshes of pyrolysis rubber powder is used for spraying during atomization spraying.
As a further improvement of the present application, when the concrete structure is built: after the concrete and the steel fibers are uniformly mixed, heating the concrete to 60-70 ℃, and then invalidating pyrolytic photoresist on the steel fibers, vibrating and tamping the concrete while heating to disperse graphite powder around the steel fibers.
As still another improvement of the present application, the detecting device in C includes a detecting box integrated with an electromagnetic wave detecting analyzer and an ultrasonic wave detecting analyzer, a detecting end is connected to the detecting box, the detecting end includes a detecting wave transmitting device, a main receiving device and an auxiliary receiving device, an ultrasonic generator and an electromagnetic wave transmitter are provided in the detecting wave transmitting device, the receiving device is opposite to the detecting wave transmitting device, the auxiliary receiving device is connected with the electromagnetic wave transmitting device, a telescopic rod is connected between the electromagnetic wave transmitting device and the main receiving device, an electric push rod is detachably mounted on a fixed end of the telescopic rod, a movable end of the electric push rod is fixedly connected with the main receiving device, and pressure sensors are mounted on opposite ends of the main receiving device and the auxiliary receiving device.
As a further improvement of the application, the concrete method for detecting the concrete structure by the detection device in C comprises: when detecting, the detecting end of the detecting equipment is attached to the concrete structure, the inner structure of the concrete is detected through ultrasonic waves, whether the concrete structure has defects or not is detected, if the defects are detected through ultrasonic waves, electromagnetic wave detection is carried out on one non-defect position by using the detecting end to detect and record the electromagnetic waves, then electromagnetic wave detection is carried out on each defect position, and when the electromagnetic waves are detected, the electromagnetic waves passing through the concrete structure and the electromagnetic waves reflected by the concrete structure are detected, and electromagnetic wave detection data of the defect position and electromagnetic wave detection data of the non-defect position are compared and analyzed.
As a further supplement of the application, when the detection equipment detects the concrete structure, if the ultrasonic detection does not detect the structural defect, the electromagnetic wave intensity change test is carried out on random multiple points, and when the electromagnetic wave intensity change test is carried out, if the intensity difference between the electromagnetic wave passing through the concrete structure and the electromagnetic wave emitted by the detection end is smaller than a set value, the corrosion probability of the steel fiber at the point is judged to be high, and the equipment gives an alarm.
As a further improvement of the application, when the concrete structure building obtained in the step B is completed, detecting the whole structure by using detection equipment, selecting a plurality of characteristic points for ultrasonic detection and electromagnetic wave detection during detection, recording the positioning points of the characteristic points, recording the ultrasonic detection and electromagnetic wave detection results, and storing initial data of the characteristic points; in the periodic detection, only feature points are detected, the change of the detected data and the initial data is analyzed, and when structural defects are detected by ultrasonic waves or the change trend of electromagnetic waves is large, an alarm is given
In conclusion, the rust-resistant steel fiber of this scheme has better self rust-resistant effect on the one hand, and on the other hand when the steel fiber rust prevention measure in concrete structure damages, check out test set can detect out fast whether rust-resistant inlayer inefficacy to this judges whether steel fiber surrounding environment is unusual, and then can in time discover before the rust-resistant complete effect of steel fiber inefficacy in the convenient concrete structure, so as to in time maintain concrete structure and steel fiber.
Drawings
FIG. 1 is a flow chart of a method according to a first embodiment of the present application;
Fig. 2 is a surface state change chart at the time of the rust inhibitive treatment of the surface of the steel fiber according to the first embodiment of the present application;
FIG. 3 is a schematic view showing the surface structure of the steel fiber according to the first embodiment of the present application when the surface rust inhibitive treatment is completed;
FIG. 4 is a perspective view of a second embodiment of the detection apparatus of the present application;
FIG. 5 is a diagram showing the operation state of the detecting device according to the second embodiment of the present application;
fig. 6 is a flowchart of a detection method according to a second embodiment of the present application.
The reference numerals in the figures illustrate:
1a detection wave transmitting device and 2a main receiving device.
Detailed Description
Three embodiments of the present application will be described in detail with reference to the accompanying drawings.
First embodiment:
FIGS. 1-3 show a method for rust prevention of steel fibers, comprising the steps of:
A, rust prevention treatment of the surface of steel fiber;
A1, preprocessing, namely cleaning and drying steel fibers; the steel fiber comprises a fiber steel wire with the length-diameter ratio of 40-80, which is prepared by a thin steel wire cutting method, a cold-rolled strip steel shearing method, a steel ingot milling method and a molten steel rapid condensation method, and the length of the steel fiber is 40-60 mm; the steel fiber of the scheme is a non-good conductor, and has low reflectivity to electromagnetic waves;
A2, then, arranging an antirust layer on the surface of the steel fiber;
A21, preparing an antirust base layer, soaking steel fibers in an epoxy resin preservative for 30-90 minutes, taking out the steel fibers, draining, and finally drying and solidifying to form a compact protective layer on the steel fibers;
A22, preparing an antirust inner layer; cleaning the steel fiber obtained in the last step, spraying a surfactant on the steel fiber, immersing the pretreated steel fiber in an electroplating solution containing copper ions, electroplating by applying current to form a copper film on the antirust base layer, and carrying out surface treatment on the antirust base layer after the antirust inner layer is prepared, wherein the surface treatment mode comprises passivation treatment and antioxidant coating;
a23, preparing an outer layer; surface treatment; carrying out electrostatic spraying by using graphite powder, obtaining steel fibers covered by the graphite powder after the electrostatic spraying, and then carrying out atomization spraying on the steel fibers by using pyrolytic photoresist powder to cover the surfaces of the steel fibers by pyrolytic photoresist; heating the steel fiber to 70-90 ℃ during spraying; after the spraying is finished, cooling the steel fiber;
The graphite powder is attached to the steel fibers only through electrostatic spraying for a certain time, and the pyrolytic rubber powder atomization spraying of the steel fibers is completed within the time period that the graphite powder is attached to the steel fibers through electrostatic spraying, so that the graphite powder is finally attached to the steel fibers through pyrolytic rubber;
after the pyrolytic gel is sprayed, the steel fibers are coated by softened pyrolytic gel, and graphite powder is coated in the pyrolytic gel at the moment, so that on one hand, the pyrolytic gel is easy to protect unused steel fibers, and on the other hand, the graphite powder is solidified on the surfaces of the steel fibers;
spraying with 50-100 mesh graphite powder during electrostatic spraying, and spraying with 10-40 mesh fine pyrolysis rubber powder during atomization spraying;
A3, drying the steel fibers to form pyrolytic glue;
The method comprises the steps of applying steel fibers, mixing the steel fibers with concrete, and then building a structure to obtain a concrete structure; when the concrete structure is built: after the concrete and the steel fibers are uniformly mixed, heating the concrete to 60-70 ℃, and then invalidating pyrolytic photoresist on the steel fibers, wherein acting force between graphite powder on the steel fibers and the steel fibers is reduced, the graphite powder is easy to desorb from the steel fibers, and vibrating and tamping are carried out on the concrete while heating, so that the graphite powder is dispersed around the steel fibers, on one hand, the graphite powder is easy to improve the compressive property of the concrete, on the other hand, the graphite powder is dispersed around the steel fibers, and gaps among the steel fibers are easy to be filled, so that when electromagnetic waves pass through a concrete structure, the situation that strength change of the electromagnetic waves is small after the electromagnetic waves pass through the concrete structure due to bypassing the transmission of the steel fibers is reduced;
Detecting rust, namely periodically detecting the concrete structure in the last step, and detecting the concrete structure using steel fibers by using detection equipment during detection; judging whether the rust-proof effect of the steel fiber in the concrete structure fails according to the detection result.
According to the technical scheme, the steel fiber is prepared by using the epoxy resin preservative as an antirust base layer, then plating copper on the antirust base layer to form a good conductor on the surface of the steel fiber, and adhering graphite on a copper film to improve the conductor performance, wherein the copper film also has an antirust effect, and the arrangement of the antirust base layer and the copper film ensures that the steel fiber is not easy to rust;
And graphite can be dispersed around the steel fiber in the mixing process of the steel fiber and the concrete so as to improve the reflection capability of the steel fiber on electromagnetic waves and facilitate the electromagnetic waves to detect the position of the steel fiber in the concrete.
According to the scheme, graphite is dispersed around the steel fibers in the process of stirring with concrete, gaps among the steel fibers in a formed concrete structure are easy to be covered by graphite powder, and before a copper film on the steel fibers fails, electromagnetic waves passing through the concrete structure are absorbed and reflected by the copper film and the graphite when the concrete structure is detected by the electromagnetic waves, so that the electromagnetic wave intensity is obviously reduced;
If the copper film fails, electromagnetic waves directly pass through the steel fiber, and at the moment, the intensity of the electromagnetic waves passing through the concrete structure is less in change during electromagnetic wave detection, so that the failure of the protective layer on the surface of the steel fiber can be judged; the steel fiber can be easily found in time before a large amount of steel fibers are rusted in the concrete structure, and the safety of the concrete structure is easily ensured.
Second embodiment
Fig. 4 to 6 show that the detection apparatus in the first embodiment C includes a detection box integrated with an electromagnetic wave detection analyzer and an ultrasonic wave detection analyzer, and a detection end is connected to the detection box, where the detection end includes a detection wave transmitting device 1, a main receiving device 2, and an auxiliary receiving device, and the main receiving device 2 and the auxiliary receiving device can both receive electromagnetic waves and ultrasonic waves; the present embodiment uses ultrasonic defect detection and electromagnetic wave detection techniques of the prior art;
Be provided with supersonic generator and electromagnetic wave transmitter in the detection wave emitter 1, receiver 2 is relative with detection wave emitter 1, and vice receiver is connected with electromagnetic wave emitter 1, is connected with the telescopic link between electromagnetic wave emitter 1 and the main receiver 2, and demountable installation has electric putter on the dead end of telescopic link, and electric putter's active end and main receiver 2 fixed connection, and pressure sensor is all installed to main receiver 2 and vice receiver's opposite end.
The concrete method for detecting the concrete structure by the detection equipment in the step C comprises the following steps: when detecting, the detecting end of the detecting equipment is attached to the concrete structure, the inner structure of the concrete is detected through ultrasonic waves, whether the concrete structure has defects or not is detected, if the defects are detected through ultrasonic waves, electromagnetic wave detection is carried out on one non-defect position by using the detecting end to detect and record the electromagnetic waves, then electromagnetic wave detection is carried out on each defect position, and when the electromagnetic waves are detected, the electromagnetic waves passing through the concrete structure and the electromagnetic waves reflected by the concrete structure are detected, and electromagnetic wave detection data of the defect position and electromagnetic wave detection data of the non-defect position are compared and analyzed.
And C, when the detection equipment detects the concrete structure, if the ultrasonic detection does not detect the structural defect, the electromagnetic wave intensity variation test is carried out on random multiple points, and when the electromagnetic wave intensity variation test is carried out, if the intensity difference between the electromagnetic wave passing through the concrete structure and the electromagnetic wave emitted by the detection end is smaller than a set value, the corrosion probability of the steel fiber at the point is judged to be high, and the equipment alarms.
According to the method, structural defects are detected in the concrete structure through detection equipment, the steel fiber perfection rate is detected through electromagnetic waves, whether the copper film on the steel fiber fails or not is judged through electromagnetic wave intensity change passing through the concrete structure during detection, early warning is carried out if the copper film fails, the situation that the environment near the steel fiber is poor can be judged, the steel fiber is easy to rust, the rust probability is high, after the copper film fails, the steel fiber can be protected for a long time through the effect of the rust-proof base layer, normal performance of the steel fiber is guaranteed to be maintained for a long time, and time is provided for related technicians to the concrete structure and steel fiber maintenance in the concrete structure.
Third embodiment
In the step B of the first embodiment, when the concrete structure built by using the steel fibers is completed, detecting the whole structure by using a detection device, selecting a plurality of characteristic points for ultrasonic detection and electromagnetic wave detection during detection, recording the positioning points of the characteristic points, recording the ultrasonic detection and electromagnetic wave detection results, and storing initial data of the characteristic points; in the regular detection, only feature points are detected, the change of detection data and initial data is analyzed, and when structural defects are detected by ultrasonic waves or the change trend of electromagnetic waves is large, an alarm is given.
In this embodiment, after the construction of the concrete structure is completed, initial data and feature point data of the concrete structure are established, wherein the feature point data includes ultrasonic detection and electromagnetic wave detection results, in the periodic detection of the concrete structure, only feature points are detected, and analysis results can be obtained quickly by comparing the detected data changes of the feature points, so that the periodic detection efficiency is convenient.
In conclusion, the rust-resistant steel fiber of this scheme has better self rust-resistant effect on the one hand, and on the other hand when the steel fiber rust prevention measure in concrete structure damages, check out test set can detect out fast whether rust-resistant inlayer inefficacy to this judges whether steel fiber surrounding environment is unusual, and then can in time discover before the rust-resistant complete effect of steel fiber inefficacy in the convenient concrete structure, so as to in time maintain concrete structure and steel fiber.
The present application is not limited to the above-described embodiments, which are adopted in connection with the actual demands, and various changes made by the person skilled in the art without departing from the spirit of the present application are still within the scope of the present application.
Claims (5)
1. A rust prevention method for steel fibers is characterized in that: the method specifically comprises the following steps:
a, rust prevention treatment of the surface of steel fiber;
a1, preprocessing, namely cleaning and drying steel fibers;
A2, then, arranging an antirust layer on the surface of the steel fiber;
A21, preparing an antirust base layer, soaking steel fibers in an epoxy resin preservative for 30-90 minutes, taking out the steel fibers, draining, and finally drying and solidifying to form a compact protective layer on the steel fibers;
A22, preparing an antirust inner layer; cleaning the steel fiber obtained in the last step, spraying a surfactant on the steel fiber, immersing the pretreated steel fiber into an electroplating solution containing copper ions, and electroplating by applying current to form a copper film on the antirust substrate;
a23, preparing an outer layer; surface treatment; carrying out electrostatic spraying by using graphite powder, obtaining steel fibers covered by the graphite powder after the electrostatic spraying, and then carrying out atomization spraying on the steel fibers by using pyrolytic photoresist powder to cover the surfaces of the steel fibers by pyrolytic photoresist; heating the steel fiber to 70-90 ℃ during spraying; after the spraying is finished, cooling the steel fiber;
A3, drying the steel fibers to form pyrolytic glue;
B, applying the steel fiber, mixing the steel fiber with concrete, and then building a structure to obtain a concrete structure; when the concrete structure is built: after the concrete and the steel fibers are uniformly mixed, heating the concrete to 60-70 ℃, and then invalidating pyrolytic photoresist on the steel fibers, vibrating and tamping the concrete while heating to disperse graphite powder around the steel fibers;
C, rust detection, namely detecting the concrete structure of the previous step periodically, wherein detection equipment is used for detecting the concrete structure using the steel fibers during detection; judging whether the rust-proof effect of the steel fiber in the concrete structure fails according to the detection result;
The detection equipment comprises a detection box integrated with an electromagnetic wave detection analyzer and an ultrasonic wave detection analyzer, wherein a detection end is connected to the detection box and comprises a detection wave transmitting device (1), a main receiving device (2) and an auxiliary receiving device, an ultrasonic generator and an electromagnetic wave transmitter are arranged in the detection wave transmitting device (1), the main receiving device (2) is opposite to the detection wave transmitting device (1), the auxiliary receiving device is connected with the detection wave transmitting device (1), a telescopic rod is connected between the detection wave transmitting device (1) and the main receiving device (2), an electric push rod is detachably arranged on the fixed end of the telescopic rod, the movable end of the electric push rod is fixedly connected with the main receiving device (2), and pressure sensors are arranged at the opposite ends of the main receiving device (2) and the auxiliary receiving device;
When detecting, the detecting end of the detecting equipment is attached to the concrete structure, the inner structure of the concrete is detected through ultrasonic waves, whether the concrete structure has defects or not is detected, if the defects are detected through ultrasonic waves, electromagnetic wave detection is carried out on one non-defect position by using the detecting end to detect and record the electromagnetic waves, then electromagnetic wave detection is carried out on each defect position, and when the electromagnetic waves are detected, the electromagnetic waves passing through the concrete structure and the electromagnetic waves reflected by the concrete structure are detected, and electromagnetic wave detection data of the defect position and electromagnetic wave detection data of the non-defect position are compared and analyzed;
if the structural defect is not detected by ultrasonic detection, the electromagnetic wave intensity variation test is carried out on random multiple points, and when the electromagnetic wave intensity variation test is carried out, if the intensity difference between the electromagnetic wave passing through the concrete structure and the electromagnetic wave emitted by the detection end is smaller than a set value, the steel fiber corrosion probability of the point is judged to be high, and the equipment gives an alarm.
2. The method for rust prevention of steel fibers according to claim 1, characterized in that: the steel fiber comprises a fiber steel wire with the length-diameter ratio of 40-80, which is prepared by a thin steel wire cutting method, a cold-rolled strip steel shearing method, a steel ingot milling method and a molten steel rapid condensation method, and the length of the steel fiber is 40-60 mm.
3. The method for rust prevention of steel fibers according to claim 1, characterized in that: the rust-proof inner layer is subjected to surface treatment after being prepared, and the surface treatment mode comprises passivation treatment and antioxidant coating.
4. The method for rust prevention of steel fibers according to claim 1, characterized in that: the electrostatic spraying is performed by using graphite powder with 50-100 meshes, and the atomizing spraying is performed by using pyrolysis rubber powder with 10-40 meshes.
5. The method for rust prevention of steel fibers according to claim 1, characterized in that: when the construction of the concrete structure obtained in the step B is completed, detecting the whole structure by using detection equipment, selecting a plurality of characteristic points for ultrasonic detection and electromagnetic wave detection during detection, recording positioning points of the characteristic points, recording ultrasonic detection and electromagnetic wave detection results, and storing initial data of the characteristic points; in the regular detection, only feature points are detected, the change of detection data and initial data is analyzed, and when structural defects are detected by ultrasonic waves or the change trend of electromagnetic waves is large, an alarm is given.
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| CN108358490A (en) * | 2018-02-27 | 2018-08-03 | 成都新柯力化工科技有限公司 | It is a kind of for the low reunion of building concrete, high magnetic orientation steel fibre and preparation method |
| CN113030259A (en) * | 2021-03-03 | 2021-06-25 | 戎志博 | Road and bridge maintenance method based on nondestructive testing |
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| KR102323879B1 (en) * | 2021-03-08 | 2021-11-09 | 박진규 | Method of repairing that provides electromagnetic shielding in concrete structures |
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| CN108358490A (en) * | 2018-02-27 | 2018-08-03 | 成都新柯力化工科技有限公司 | It is a kind of for the low reunion of building concrete, high magnetic orientation steel fibre and preparation method |
| CN113030259A (en) * | 2021-03-03 | 2021-06-25 | 戎志博 | Road and bridge maintenance method based on nondestructive testing |
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