CN113213823A - Magnetic cement mortar damage detection sensor and manufacturing method and application thereof - Google Patents
Magnetic cement mortar damage detection sensor and manufacturing method and application thereof Download PDFInfo
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- CN113213823A CN113213823A CN202110456157.5A CN202110456157A CN113213823A CN 113213823 A CN113213823 A CN 113213823A CN 202110456157 A CN202110456157 A CN 202110456157A CN 113213823 A CN113213823 A CN 113213823A
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- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/84—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields by applying magnetic powder or magnetic ink
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00422—Magnetic properties
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00991—Uses not provided for elsewhere in C04B2111/00 for testing
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
A magnetic cement mortar damage detection sensor and a manufacturing method and application thereof. The preparation method comprises the following steps: firstly, stirring fine aggregate and neodymium iron boron permanent magnet powder for 60s by using a stirrer, adding cement and water, and then stirring for 120s to mix uniformly; pouring cement mortar into a mortar test mold coated with machine oil at one time, scraping off the excessive part on the top surface after the surface of the test piece is slightly dry after vibration and leveling; standing the test piece for one day at room temperature after manufacturing the test piece, and then removing the mold, and magnetizing the test piece after removing the mold by using a pulse type magnetizing machine; and placing the magnetized magnetic cement mortar damage detection sensor into a standard curing room for curing. The magnetic cement mortar damage detection sensor prepared by the invention has certain magnetism, and is beneficial to the continuous operation of cement hydration reaction; meanwhile, the magnetic damage detection sensor can be applied to research, development and application of intelligent pavements in intelligent traffic large environments, including but not limited to magnetic navigation technology and magnetic-thermal ice and snow melting technology.
Description
Technical Field
The invention belongs to the technical field of magnetic cement mortar sensors, and particularly relates to a magnetic cement mortar damage detection sensor and a manufacturing method and application thereof.
Background
At present, the main means for improving the performance of cement mortar by utilizing magnetic effect is to mix the cement mortar by magnetized water, and the main hypothesis about the research of the magnetized water is as follows: in a normal-temperature aqueous solution at 20 ℃, water molecules have weaker activity due to stronger hydrogen bond action, water generates repulsion force under the influence of a magnetic field in the magnetic field, disordered free motion is gradually converted into directional motion, the binding rate of the hydrogen bond in the water is reduced, and the activity of the water molecules is increased, so that the function of improving the property of the cement concrete is achieved. The magnetism of the neodymium iron boron permanent magnet material is utilized to replace part of fine aggregates to be doped into cement mortar, and after the permanent magnetic field is formed in the cement mortar after magnetization, the effects of enabling water molecules to move directionally for a long time and increasing the activity of the water molecules can be achieved, so that the purposes of enhancing the strength of the cement mortar and improving the properties of the cement mortar are achieved.
With the continuous progress of the current scientific technology and the continuous expansion of the construction scale of the transportation infrastructure, the social requirement on roads is higher and higher, and the construction of intelligent roads becomes the inevitable trend of future traffic development. The damage detection sensor is manufactured by utilizing the stable magnetic property of the material after the material is magnetized by the doped neodymium iron boron permanent magnet powder, and the road structure damage detection can be carried out by monitoring the change of the magnetic property of the structure, so that the aim of detecting the road damage condition on the premise of ensuring the integrity of the road structure is fulfilled; in addition, the magnetic field generated by the sensor can be further applied to an electromagnetic navigation technology to replace an electromagnetic field generated by a lead, the accurate positioning of the unmanned automobile is realized by utilizing the action of the electromagnetic field, the capital investment required by lead laying and maintenance is reduced, and the development of the unmanned technology is accelerated; the magnetic heat effect is utilized, after an external magnetic field is applied to a road using the magnetic sensor, the purpose of heating the road surface can be achieved, and the heating temperature can be further controlled to be further applied to the ice and snow melting technology in winter in northern areas.
Disclosure of Invention
The invention aims to provide a novel sensor for intelligent development of roads, and provides a magnetic cement mortar damage detection sensor and a manufacturing method and application thereof aiming at the development of a pavement nondestructive detection technology.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a magnetic cement mortar damage detection sensor is prepared from 15-25 parts of cement, 20-30 parts of neodymium iron boron permanent magnet powder, 40-50 parts of fine aggregate and 10-15 parts of water according to mass ratio.
The manufacturing method of the magnetic cement mortar damage detection sensor comprises the following steps:
firstly, putting neodymium iron boron permanent magnet powder and fine aggregates into a stirrer, stirring for 60s, uniformly mixing, and controlling the stirring temperature to be 20 +/-5 ℃;
secondly, placing the cement and the water into the stirrer in the first step, continuously stirring for 120s, and fully mixing;
thirdly, pouring the cement mortar obtained in the second step into a mould coated with machine oil for one time, after vibrating, scraping the excessive part on the top surface and leveling after the surface of the test piece is slightly dry;
fourthly, standing the test piece obtained in the third step for one day at room temperature, then removing the mold, and magnetizing the removed test piece from the specified direction by using a pulse type magnetizing machine according to the requirement;
fifthly, placing the magnetized test piece obtained in the step four into a standard curing room with the temperature of 20 +/-2 ℃ and the relative humidity of 90% for curing, and obtaining the magnetic cement mortar damage detection sensor after curing for a specified age.
The application of the magnetic cement mortar damage detection sensor is applied to intelligent road construction.
A magnetic cement mortar damage detection sensor is prepared from 10-20 parts of cement, 15-25 parts of neodymium iron boron permanent magnet powder, 5-15 parts of fine aggregate, 40-50 parts of coarse aggregate and 5-10 parts of water according to mass ratio.
A magnetic cement mortar damage detection sensor is prepared from 10-20 parts of cement, 15-25 parts of ferrite permanent magnet powder, 5-15 parts of fine aggregate, 40-50 parts of coarse aggregate and 5-10 parts of water according to mass ratio.
Compared with the prior art, the invention has the beneficial effects that: the magnetic cement mortar damage detection sensor prepared by the invention has stronger magnetism, and the magnetic field intensity in the magnetizing direction can still reach more than 500Gs under the condition of lower doping amount of neodymium iron boron permanent magnet powder. The magnetic cement mortar damage detection sensor has magnetism due to the manufacturing method, so that on one hand, the magnetic cement mortar damage detection sensor has positive influence on the improvement of the properties of cement mortar; on the other hand, the damage detection sensor can be applied to road nondestructive detection; in addition, the stable characteristics of the damage detection sensor have positive effects on the aspects of electromagnetic navigation technology and magnetic-thermal ice and snow melting technology.
In conclusion, the magnetic cement mortar damage detection sensor applied to intelligent road construction, which is prepared by the invention, has stable magnetism, the magnetic field intensity can reach 500Gs, and the sensor can be applied to road nondestructive detection, electromagnetic navigation and the magnetic heat ice and snow melting direction on the premise of intelligent road development, and has certain promotion effect and important significance for the intelligent road development in China.
Drawings
FIG. 1 is a diagram of a result of magnetism measurement of a neodymium iron boron cement mortar test piece before magnetization;
FIG. 2 is a graph of the result of magnetic measurement of the magnetized NdFeB cement mortar test piece;
FIG. 3 is a normal magnetic surface diagram of the magnetized NdFeB cement mortar test piece;
FIG. 4 is a crack surface diagram of the magnetized NdFeB cement mortar test piece after magnetic damage;
FIG. 5 is a graph of the result of magnetic measurement of a neodymium iron boron cement mortar test piece with cracks on the surface after magnetization.
Detailed Description
The technical solutions of the present invention are further described below with reference to the drawings and the embodiments, but the present invention is not limited thereto, and modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
The first embodiment is as follows: the embodiment describes a magnetic cement mortar damage detection sensor which is prepared from 15-25 parts of cement, 20-30 parts of neodymium iron boron permanent magnet powder, 40-50 parts of fine aggregate and 10-15 parts of water according to mass ratio.
The magnetic cement mortar damage detection sensor prepared by the invention has certain magnetism, and is beneficial to the continuous operation of cement hydration reaction; tests prove that the nondestructive testing device can perform the function of nondestructive testing on the surface damage of the test piece; meanwhile, the magnetic damage detection sensor can be applied to research, development and application of intelligent pavements in intelligent traffic large environments, including but not limited to magnetic navigation technology and magnetic-thermal ice and snow melting technology.
The second embodiment is as follows: a method for manufacturing a magnetic cement mortar damage detection sensor according to a specific embodiment, the method specifically includes:
firstly, putting neodymium iron boron permanent magnet powder and fine aggregates into a stirrer, stirring for 60s, uniformly mixing, and controlling the stirring temperature to be 20 +/-5 ℃;
secondly, placing the cement and the water into the stirrer in the first step, continuously stirring for 120s, and fully mixing;
thirdly, pouring the cement mortar obtained in the second step into a mould coated with machine oil for one time, after vibration (manual vibration or mechanical vibration) is carried out, scraping off the redundant part of the top surface and leveling;
fourthly, standing the test piece obtained in the third step for one day at room temperature, then removing the mold, and magnetizing the removed test piece from the specified direction by using a pulse type magnetizing machine according to the requirement;
fifthly, placing the magnetized test piece obtained in the step four into a standard curing room with the temperature of 20 +/-2 ℃ and the relative humidity of 90% for curing, and obtaining the magnetic cement mortar damage detection sensor after curing for a specified age.
The second embodiment is as follows: the application of the magnetic cement mortar damage detection sensor in the first embodiment is applied to intelligent road construction.
The magnetic cement mortar damage detection sensor of the embodiment has stronger magnetism, and the magnetic field intensity in the magnetizing direction can still reach more than 500Gs under the condition that the doping amount of the neodymium iron boron permanent magnet powder is lower. Because the cement mortar test piece has magnetism, on one hand, the improvement on the properties of the cement mortar is positively influenced; on the other hand, the damage detection sensor can be applied to road nondestructive detection; in addition, this characteristic of stability of the damage detection sensor itself has a positive influence on both the electromagnetic navigation technology and the magnetocaloric ice-snow melting technology.
The fourth concrete implementation mode: the embodiment describes a magnetic cement mortar damage detection sensor which is prepared from 10-20 parts of cement, 15-25 parts of neodymium iron boron permanent magnet powder, 5-15 parts of fine aggregate, 40-50 parts of coarse aggregate and 5-10 parts of water according to mass ratio. The specific preparation method is similar to that of the first embodiment, and the coarse aggregate and the fine aggregate are added simultaneously.
The fifth concrete implementation mode: the embodiment describes a magnetic cement mortar damage detection sensor which is prepared from 10-20 parts of cement, 15-25 parts of ferrite permanent magnet powder, 5-15 parts of fine aggregate, 40-50 parts of coarse aggregate and 5-10 parts of water according to mass ratio. In the embodiment, the ferrite permanent magnet powder is used for replacing the neodymium iron boron permanent magnet powder, so that the cost can be further reduced. The specific preparation method is the same as that of the fourth embodiment.
Example 1:
the preparation method of the magnetic cement mortar damage detection sensor applied to intelligent road construction comprises the following steps:
weighing 15-25 parts of cement, 20-30 parts of neodymium iron boron permanent magnet powder, 40-50 parts of fine aggregate and 10-15 parts of water according to the mass fraction;
secondly, putting the neodymium iron boron permanent magnet powder and the fine aggregate weighed in the step one into a stirrer, stirring for 60s, uniformly mixing, and controlling the stirring temperature to be 20 +/-5 ℃;
thirdly, putting the cement and the water weighed in the step one into a stirrer to continue stirring for 120s until the cement and the water are fully mixed;
pouring the cement mortar obtained in the step three into a mould coated with machine oil at one time, after vibrating, scraping off the excessive part on the top surface and leveling;
fifthly, standing the test piece obtained in the step four for one day at room temperature, then removing the mold, and magnetizing the removed test piece from the specified direction by using a pulse type magnetizing machine according to the requirement;
sixthly, placing the magnetized test piece obtained in the fifth step into a standard curing room with the temperature of 20 +/-2 ℃ and the relative humidity of 90% for curing, and obtaining the magnetic cement mortar damage detection sensor applied to intelligent road construction after curing for a specified age.
Test example 1:
firstly, the developed magnetic cement mortar is made into a plurality of cuboid test pieces with the thickness of 10mm multiplied by 30 mm.
And secondly, the manufactured test piece is subjected to mold removal after standing for one day at room temperature, one part of the test piece is not magnetized after the mold removal, and the other part of the test piece is magnetized in the radial direction by using a magnetizing machine.
And thirdly, placing the two groups of test pieces into a standard curing room with the temperature of 20 +/-2 ℃ and the relative humidity of 90% for curing for a specified age.
And fourthly, respectively measuring the magnetic field intensity of the two test pieces at the same position by using a tesla meter, wherein the experimental result is shown in the figure 1-2.
Fig. 1 is a magnetic field intensity measurement result of an un-magnetized ndfeb permanent magnet powder cement mortar test piece, and fig. 2 is a magnetic field intensity measurement result of a magnetized ndfeb permanent magnet powder cement mortar test piece. As is apparent from the figure, the neodymium iron boron permanent magnet powder cement mortar test piece which is not magnetized has no obvious magnetism in the radial direction, and the magnetic field intensity of the magnetized neodymium iron boron permanent magnet powder cement mortar test piece can reach more than 500Gs in the magnetizing direction; therefore, the cement mortar material has obvious magnetism and can be applied to intelligent road construction.
Test example 2:
firstly, the developed magnetic cement mortar is made into a cuboid test piece with the thickness of 10mm multiplied by 30mm, the made test piece is subjected to mould removal after standing for one day at room temperature, and a magnetizing machine is used for radial magnetizing the test piece after the mould removal.
Secondly, the test piece is put into a standard curing room with the temperature of 20 +/-2 ℃ and the relative humidity of 90 percent for curing for a specified age, and the surface of the test piece is shown in figure 3.
And thirdly, measuring the magnetic field intensity of the test piece in the magnetizing direction by using a Tesla meter.
And fourthly, damaging the surface of the test piece to enable obvious cracks to appear in the test piece as shown in figure 4.
And fifthly, measuring the magnetic field intensity of the test piece in the magnetizing direction again by using a Tesla meter.
FIG. 2 shows the magnetic field strength of the Nd-Fe-B permanent magnet powder cement mortar specimen in the magnetizing direction before being damaged, which is 501.5 Gs; FIG. 5 shows the magnetic field strength of the NdFeB permanent magnet powder cement mortar test piece after the NdFeB permanent magnet powder cement mortar test piece is broken to have obvious cracks, which is 424.6 Gs; therefore, the magnetic field intensity of the neodymium iron boron permanent magnet powder cement mortar test piece is obviously reduced along with the damage of the neodymium iron boron permanent magnet powder cement mortar test piece, so that the magnetic cement mortar damage detection sensor has an obvious effect on the aspect of a road nondestructive detection technology.
Claims (5)
1. The utility model provides a magnetism cement mortar damage detection sensor which characterized in that: the sensor is prepared from 15-25 parts of cement, 20-30 parts of neodymium iron boron permanent magnet powder, 40-50 parts of fine aggregate and 10-15 parts of water according to mass ratio.
2. A method for manufacturing a magnetic cement mortar damage detection sensor according to claim 1, characterized in that: the manufacturing method specifically comprises the following steps:
firstly, putting neodymium iron boron permanent magnet powder and fine aggregates into a stirrer, stirring for 60s, uniformly mixing, and controlling the stirring temperature to be 20 +/-5 ℃;
secondly, placing the cement and the water into the stirrer in the first step, continuously stirring for 120s, and fully mixing;
thirdly, pouring the cement mortar obtained in the second step into a mould coated with machine oil for one time, after vibrating, scraping the excessive part on the top surface and leveling after the surface of the test piece is slightly dry;
fourthly, standing the test piece obtained in the third step for one day at room temperature, then removing the mold, and magnetizing the removed test piece from the specified direction by using a pulse type magnetizing machine according to the requirement;
fifthly, placing the magnetized test piece obtained in the step four into a standard curing room with the temperature of 20 +/-2 ℃ and the relative humidity of 90% for curing, and obtaining the magnetic cement mortar damage detection sensor after curing for a specified age.
3. Use of the magnetic cement mortar damage detection sensor of claim 1, characterized in that: the sensor is applied to intelligent road construction.
4. The utility model provides a magnetism cement mortar damage detection sensor which characterized in that: the sensor is prepared from 10-20 parts of cement, 15-25 parts of neodymium iron boron permanent magnet powder, 5-15 parts of fine aggregate, 40-50 parts of coarse aggregate and 5-10 parts of water according to the mass ratio.
5. The utility model provides a magnetism cement mortar damage detection sensor which characterized in that: the sensor is prepared from 10-20 parts of cement, 15-25 parts of ferrite permanent magnetic powder, 5-15 parts of fine aggregate, 40-50 parts of coarse aggregate and 5-10 parts of water according to the mass ratio.
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| EP4276083A1 (en) * | 2022-05-13 | 2023-11-15 | Holcim Technology Ltd | Magnetizable concrete composition |
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