CN109580346B - Device and method for measuring compressive resistance of expanded cement slurry by using magnetic force - Google Patents
Device and method for measuring compressive resistance of expanded cement slurry by using magnetic force Download PDFInfo
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- CN109580346B CN109580346B CN201811393522.7A CN201811393522A CN109580346B CN 109580346 B CN109580346 B CN 109580346B CN 201811393522 A CN201811393522 A CN 201811393522A CN 109580346 B CN109580346 B CN 109580346B
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- 239000004568 cement Substances 0.000 title claims abstract description 64
- 239000002002 slurry Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title description 12
- 239000011405 expansive cement Substances 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 239000011229 interlayer Substances 0.000 claims abstract description 9
- 230000000712 assembly Effects 0.000 claims abstract description 6
- 238000000429 assembly Methods 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 239000002390 adhesive tape Substances 0.000 claims description 15
- 239000002985 plastic film Substances 0.000 claims description 12
- 229920006255 plastic film Polymers 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims 2
- 230000005389 magnetism Effects 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- 239000011440 grout Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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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
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
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- General Health & Medical Sciences (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
The invention discloses a device for measuring the compression resistance of expanded cement slurry by using magnetic force, which comprises a plurality of arc-shaped insulating blocks, wherein an interlayer is arranged in each arc-shaped insulating block, a plurality of solenoids for generating electromagnetic force are respectively arranged on two sides in the interlayer, a cylindrical barrel structure is formed by combining the arc-shaped insulating blocks, locking hoop assemblies are respectively arranged at the upper end and the lower end of the cylindrical barrel structure, a bottom plate is packaged at the inner bottom of the cylindrical barrel structure, a top plate is arranged at the top of the cylindrical barrel structure in a limiting manner through a sealing cover plate, and a cover plate is arranged at the top of the top plate. The device can protect the structure of the expansive cement slurry and can be damaged, has high adjustability, and can adjust the stress state which is most suitable for the environment according to different environmental conditions; and its structural design of device is simple reasonable, and the equipment is convenient, and is with low costs, has still guaranteed the experimental requirement.
Description
Technical Field
The invention relates to a device and a method for measuring the pressure resistance of expansive cement paste by using magnetic force, which can particularly solve the problem that the structure of the expansive cement paste is damaged after the surrounding stress is removed, and is suitable for simulating the situation that the expansive cement paste is subjected to the extrusion force of the surrounding environment in the real environment.
Background
The properties of the expansive cement paste are different from those of ordinary cement paste, and the expansive cement paste can expand in the forming process so as to increase the compressive strength of the expansive cement paste, but the expansive cement paste needs the surrounding environment to provide pressure for the expansive cement paste in the forming process, and cannot be in a fixed form. Therefore, in order to measure the compressive strength of the expanded cement slurry more accurately, it is necessary to measure the compressive strength under ambient pressure conditions. At present, no device which provides constraint force by utilizing magnetic force can be damaged under the condition of providing surrounding stress for the expanded cement paste, so that in order to solve the problems, the device adopts a proper method, and the accurate measurement of the compressive strength of the expanded cement paste is possible.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the compressive strength of expanded cement paste by using magnetic force, aiming at the problem that when the compressive strength of the expanded cement paste is measured, a common device cannot be damaged in the measuring process, if the device is removed, the expanded cement paste can be damaged, the two problems can be well solved by adopting the conventional device, the structure of the expanded cement paste can be protected, meanwhile, the expanded cement paste can be damaged, the device has high adjustability, and the stress state which is most suitable for the environment can be adjusted according to different environmental conditions; and its structural design of device is simple reasonable, and the equipment is convenient, and is with low costs, has still guaranteed the experimental requirement.
In order to achieve the technical features, the invention is realized as follows: the utility model provides an utilize magnetic force to measure device of crushing resistance ability of inflation grout, it includes polylith arc insulating block, and the inside of every arc insulating block all is provided with the intermediate layer, interbedded inside both sides are provided with a plurality of solenoids that are used for producing the electromagnetic force respectively, constitute cylinder tube structure after the combination between the polylith arc insulating block, the locking hoop subassembly is installed respectively at the upper and lower both ends of cylinder tube structure, the interior bottom of cylinder tube structure is packaged with the bottom plate, and the top is installed through the closing cap board is spacing at cylinder tube structure's top, the apron is installed at the top of top.
The locking hoop component comprises two semicircular hoops which are symmetrically arranged, connecting lugs are arranged at two ends of each semicircular hoop, and the connecting lugs are fixedly connected through bolt components.
And a central threaded hole matched with the cover plate is processed in the central position of the top plate.
The center of the cover plate is provided with a central threaded column which is matched with a central threaded hole of the top plate and seals the cylindrical barrel structure.
The bottom end of the arc-shaped insulating block is provided with a limiting skirt edge, and the limiting skirt edge is matched with the bottom plate and is used for limiting the bottom plate; and a first threaded hole is processed at the top end of the arc-shaped insulating block.
The cover sealing plate is of an arc-shaped plate structure, a plurality of second threaded holes are uniformly distributed and processed in the cover sealing plate, and the second threaded holes are matched with the first threaded holes in the tops of the arc-shaped insulating blocks.
And the inner walls of the bottom end and the top end of the arc-shaped insulating block are provided with limiting skirt edges.
The arc-shaped insulating blocks are four in number, and the whole cylindrical barrel structure is formed after the arc-shaped insulating blocks are folded and combined.
At least 8 solenoids are installed in each arc-shaped insulating block and are symmetrically arranged on two sides of the interlayer respectively.
The test method for measuring the compressive property of the expanded cement slurry by using the magnetic force comprises the following steps:
step 1: preparing materials required by the device, selecting four arc-shaped insulating blocks, and installing a solenoid in each arc-shaped insulating block;
step 2: a pressure sensor is arranged on the inner wall of each arc-shaped insulating block;
step 3: selecting two arc-shaped insulating blocks and assembling the two arc-shaped insulating blocks, installing a bottom plate on the limiting skirt edge at the bottom after assembling is finished, and placing a top plate on the top;
step 4: adhering double-sided adhesive tapes to the inner walls of the two assembled arc-shaped insulating blocks, adhering double-sided adhesive tapes to the inner sides of the bottom plate and the top plate, adhering a plastic film to the place where the double-sided adhesive tapes are adhered, adhering double-sided adhesive tapes to the inner sides of the other two assembled arc-shaped insulating blocks, adhering the plastic film, folding and combining the four arc-shaped insulating blocks to form a whole cylindrical barrel structure, and extending an opening of the plastic film out of a central threaded hole of the top plate;
step 5: sleeving locking hoop components at two ends of the cylindrical barrel structure, and fixing the locking hoop components by using bolt components;
step 6: selecting expanded cement slurries with different preparation ratios for filling: preparing 7 groups of cement slurries with different expanding agent contents for standby use according to experimental requirements, weighing 3 groups of cement with the label of 42.5 by using an electronic scale, weighing 1000g, 950g, 900g, 850g, 800g, 750g and 700g of the cement, weighing 0g, 50g, 100g, 150g, 200g, 250g and 300g of the expanding agent, weighing 7 groups of warm water, and mixing the 7 groups of cement, the expanding agent and the warm water in sequence to prepare the expansion with the expanding agent contents of 0, 5%, 10%, 15%, 20%, 25% and 30%;
step 7: lifting a top plate with a central threaded hole to the top end of the cylindrical barrel structure by using a hook, filling expansion cement slurry into the device from the central threaded hole of the screw, sealing the film strip when the device is full of the expansion cement slurry, plugging the redundant part of the film strip into the device, and then tightly twisting a cover plate with a central threaded column and the central threaded hole;
step 8: maintaining under proper conditions, and recording readings of the four pressure sensors;
step 9: transferring the device to a laboratory for measuring compressive strength after 28 days of maintenance, providing current for the solenoid according to data displayed by the pressure sensor and taking the average number of the data, continuously increasing the current until the expansion pressure of the expanded cement slurry recorded by the pressure sensor is reached, and keeping the current magnitude, namely maintaining the current expansion pressure;
step 10: and then the locking hoop assembly is disassembled, a screw rod of the pressure testing machine is aligned to a top plate of the cylindrical barrel structure, and the pressure testing machine is started to measure the compressive strength of the expansive cement slurry under different expansive agent contents.
The invention has the following beneficial effects:
1. because different test experiments require different extrusion forces of the surrounding environment and the most appropriate pressure needs to be adjusted according to the actual situation, the device can well solve the problem, the electrified solenoid adopted by the device is used as the electromagnet, and the size of the current passing through the solenoid can be adjusted according to the reading of the pressure sensor, so that the size of the extrusion force can be adjusted; the device has high adjustability, and can adjust the stress state suitable for the environment according to different environmental conditions, so that the real environment can be better simulated.
2. In order to ensure that the expansion cement reaches certain strength in the experimental process, the upper sealing component designed by the device can limit the upward expansion of the expansion cement slurry and crush the expansion cement slurry along with the downward movement of the pressure cover plate when the compression strength of the expansion cement slurry is measured so as to test the compression strength of the expansion cement slurry.
3. When measuring the compressive strength of inflation grout, the device's locking hoop subassembly utilizes magnetic force to maintain inflation stress, and its device intensity itself can not restrict inflation grout and destroy and arouse the result error in measurement process like this, can also simulate when the intensity forms in the earlier stage of protection inflation grout and destroy in being close real environment, makes the test result more accurate.
4. The device can be recycled, has a simple structure, is easy to obtain materials, and can greatly reduce the difficulty of measurement.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is an overall structural view of a first arc-shaped insulating block according to the present invention after being assembled.
Fig. 2 is a diagram of a first monolithic arcuate insulation block assembly process of the present invention.
Figure 3 is an assembled view of the locking band assembly of the present invention.
Fig. 4 is a top plate structure view of the present invention.
Fig. 5 is a structural view of the cover plate of the present invention.
Fig. 6 is a second monolithic arcuate dielectric block pattern in accordance with the present invention.
Fig. 7 is an overall structural view of a second arc-shaped insulating block according to the present invention after being assembled.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1-7, a device for measuring compressive strength of expansive cement slurry by using magnetic force comprises a plurality of arc-shaped insulating blocks 3, an interlayer 9 is arranged inside each arc-shaped insulating block 3, a plurality of solenoids 10 for generating electromagnetic force are respectively arranged on two sides inside the interlayer 9, the arc-shaped insulating blocks 3 are combined to form a cylindrical barrel structure, locking hoop assemblies 4 are respectively arranged at the upper end and the lower end of the cylindrical barrel structure, a bottom plate is packaged at the inner bottom of the cylindrical barrel structure, a top plate 6 is installed at the top of the cylindrical barrel structure in a limiting manner through a sealing cover plate 5, and a cover plate 15 is installed at the top of the top plate 6. The device adopting the structure can be used for adjusting the magnitude of current passing through the solenoid according to the indication number of the pressure sensor, so that the magnitude of the extrusion force is adjusted; the device has high adjustability, and can adjust the stress state suitable for the environment according to different environmental conditions, so that the real environment can be better simulated.
Furthermore, locking hoop component 4 includes two symmetrical arrangement's semi-circular clamp 2, is provided with engaging lug 1 at the both ends of semi-circular clamp 2, pass through bolt assembly 16 fixed the linking to each other between the engaging lug 1.
Further, a central threaded hole 7 matched with the cover plate 15 is machined in the central position of the top plate 6.
Further, the center of the cover plate 15 is provided with a central threaded column 14, and the central threaded column 14 is matched with the central threaded hole 7 of the top plate 6 and seals the cylindrical barrel structure.
Further, a limiting skirt edge 13 is arranged at the bottom end of the arc-shaped insulating block 3, and the limiting skirt edge 13 is matched with the bottom plate and limits the bottom plate; the top end of the arc-shaped insulating block 3 is provided with a first threaded hole 11.
Further, the cover sealing plate 5 is of an arc-shaped plate structure, a plurality of second threaded holes 12 are uniformly formed in the cover sealing plate 5, and the second threaded holes 12 are matched with the first threaded holes 11 in the top of the arc-shaped insulating block 3.
Furthermore, the inner walls of the bottom end and the top end of the arc-shaped insulating block 3 are both provided with limiting skirt edges 13.
Furthermore, the arc-shaped insulating blocks 3 are four in total, and the whole cylindrical barrel structure is formed after the arc-shaped insulating blocks are folded and combined. The cylindrical barrel structure can be used for filling expansion cement slurry.
Further, at least 8 solenoids 10 are installed inside each arc-shaped insulating block 3 and are symmetrically arranged on two sides of the interlayer 9 respectively. The solenoid 10 is adopted, namely the N pole is arranged outwards on one side of the contact part of the adjacent arc-shaped insulating blocks 3, and the S pole is arranged outwards on the other insulating plate, so that the attraction of the solenoid 10 is ensured.
Further, a pressure sensor is pasted at the center position in each arc-shaped insulating block 3, and the purpose is as follows: the pressure of the expanded cement slurry with different contents of the expanding agent on the pipe wall can be measured through the pressure sensor, so that the corresponding change rule of the contents of the expanding agent in the expanded cement slurry and the pressure is obtained; according to the pressure values of the expanded cement slurry with different contents of the expanding agent, the current of the electrified solenoid is adjusted to provide enough magnetic force for the expanded cement slurry, so that enough constraint force is provided for the expanded cement slurry; when pressure is applied to the cured expanded cement paste to measure the compressive strength of the cured expanded cement paste, the lateral pressure of the upper part of the expanded cement paste on the pipe wall after the pressure is applied can be measured through the pressure sensor, and data support is provided for research of the expanded cement paste in the real environment in the later period.
Further, pressure sensor arranges the back, and 3 inboard double faced adhesive tapes that have pasted of arc insulating block, then pastes plastic film in the device the inside with the double faced adhesive tape, its aim at: the thin plastic bag can prevent the expanded cement paste from being adhered to the wall of the device, thereby facilitating the recycling of the device and avoiding the cleaning process; slurry leakage is avoided; the direct contact between the pressure sensor and the expansive cement slurry is avoided, and the cyclic utilization rate of the pressure sensor is effectively improved.
Further, pressure sensor, aim at have been put to arc insulating block 3's bottom plate and roof equipartition: the pressure value of the cover plate pressure sensor is compared with the pressure of a pressure testing machine, so that the compressive strength of the expanded cement paste is obtained more accurately; the pressure values of the bottom plate pressure sensor and the top plate pressure sensor are compared, and the expansion pressure change rule of the expansion cement slurry from the upper end to the lower end is analyzed, and the change rule of the pressures borne by the upper end and the lower end is analyzed when an external force is applied.
Further, the rigidity of iron material of device, locking hoop component 4 should be enough strong and all do anticorrosive treatment, make the device have enough intensity restriction inflation grout inflation, should guarantee moreover that locking hoop component 4 can fasten the device during maintenance, and the inflation grout inflation of at utmost restriction inflation grout inflation, the device is detachable and assembles simply, is convenient for its cyclic utilization like this.
Further, the inside intermediate layer that is provided with in the place of 3 edge contact of every arc insulating block and all scribble a layer insulating cement on its surface, its aim at: install the circular telegram solenoid in the intermediate layer, after circular telegram like this, through the magnetic force that circular telegram solenoid provided for each arc insulating block 3 of taking the camera obscura is inseparable attraction together, thereby provide sufficient confining force to inflation grout, and the magnetic force that circular telegram solenoid provided can be as required through control current size and then adjust magnetic force size, and arc insulating block 3 scribbles insulating cement, does not influence the magnetic force of circular telegram solenoid.
First, two arc-shaped insulating blocks 3 with small electrified solenoids are spliced together, then a bottom plate is placed at one end of the two ends of the device, a top plate with a threaded hole is placed at the other end of the device, then the remaining two arc-shaped insulating blocks 3 with small electrified solenoids are correspondingly spliced, an opening of a plastic film extends out of the threaded hole of the top plate, and finally the hollow cylindrical device is assembled;
secondly, directly assembling four arc-shaped insulating blocks 3 with small-sized electrified solenoids together, then placing a round thick iron plate 5 at the bottom end of the device, then pasting a plurality of double-sided adhesive tapes on each material, then pasting a plastic film, and finally assembling into a uncovered hollow cylinder type device; after assembly, the locking band assembly 4 is sleeved on the two heads of the device and fixed by the bolt assembly 16.
Example 2:
the test method for measuring the compressive property of the expanded cement slurry by using the magnetic force comprises the following steps:
step 1: preparing materials required by the device, selecting four arc-shaped insulating blocks 3, and installing a solenoid 10 in each arc-shaped insulating block 3;
step 2: a pressure sensor is arranged on the inner wall of each arc-shaped insulating block 3;
step 3: selecting two arc-shaped insulating blocks 3, assembling the two arc-shaped insulating blocks, installing a bottom plate on a limiting skirt 13 at the bottom in a limiting manner after assembling is finished, and placing a top plate 6 at the top;
step 4: adhering double-sided adhesive tapes to the inner walls of the two assembled arc-shaped insulating blocks 3, adhering double-sided adhesive tapes to the inner sides of the bottom plate and the top plate 6, adhering a plastic film to a place where the double-sided adhesive tapes are adhered, adhering double-sided adhesive tapes to the inner sides of the other two assembled arc-shaped insulating blocks 3, adhering the plastic film, folding and combining the last four arc-shaped insulating blocks 3 to form a whole cylindrical barrel structure, and extending an opening of the plastic film out of a central threaded hole 7 of the top plate 6;
step 5: sleeving the two ends of the cylindrical barrel structure with locking hoop assemblies 4, and fixing the locking hoop assemblies by using bolt assemblies 16;
step 6: selecting expanded cement slurries with different preparation ratios for filling: preparing 7 groups of cement slurries with different expanding agent contents for standby use according to experimental requirements, weighing 3 groups of cement with the label of 42.5 by using an electronic scale, weighing 1000g, 950g, 900g, 850g, 800g, 750g and 700g of the cement, weighing 0g, 50g, 100g, 150g, 200g, 250g and 300g of the expanding agent, weighing 7 groups of warm water, and mixing the 7 groups of cement, the expanding agent and the warm water in sequence to prepare the expansion with the expanding agent contents of 0, 5%, 10%, 15%, 20%, 25% and 30%;
step 7: firstly, lifting a top plate 6 with a central threaded hole 7 to the top end of a cylindrical barrel structure by using a hook, filling expansion cement slurry into the device from the central threaded hole 7, sealing the device by using a film belt when the device is filled with the expansion cement slurry, plugging the redundant part of the device into the device, and then tightly twisting a cover plate 15 with a central threaded column and the central threaded hole 7;
step 8: maintaining under proper conditions, and recording readings of the four pressure sensors;
step 9: transferring the device to a laboratory for measuring compressive strength after 28 days of maintenance, providing current for the solenoid 10 according to data displayed by the pressure sensor and taking the average of the data, continuously increasing the current until the expansion pressure of the expanded cement slurry recorded by the pressure sensor is reached, and keeping the current magnitude, namely maintaining the current expansion pressure;
step 10: and then the locking hoop assembly 4 is disassembled, a screw rod of the pressure testing machine is aligned to a top plate 6 of the cylindrical barrel structure, and the pressure testing machine is started to measure the compressive strength of the expanded cement slurry under different expanding agent contents.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the claims.
Claims (6)
1. A device for measuring the compressive resistance of expansive cement slurry by using magnetic force comprises a plurality of arc-shaped insulating blocks (3), wherein an interlayer (9) is arranged inside each arc-shaped insulating block (3), a plurality of solenoids (10) used for generating electromagnetic force are respectively arranged on two sides inside the interlayer (9), a cylindrical barrel structure is formed after the arc-shaped insulating blocks (3) are combined, locking hoop assemblies (4) are respectively arranged at the upper end and the lower end of the cylindrical barrel structure, a bottom plate is packaged at the inner bottom of the cylindrical barrel structure, a top plate (6) is installed at the top of the cylindrical barrel structure in a limiting manner through a sealing cover plate (5), and a cover plate (15) is installed at the top of the top plate (6);
the locking hoop component (4) comprises two symmetrically arranged semicircular hoops (2), connecting lugs (1) are arranged at two ends of each semicircular hoop (2), and the connecting lugs (1) are fixedly connected through bolt components (16);
a central threaded hole (7) matched with the cover plate (15) is processed in the central position of the top plate (6);
a central threaded column (14) is arranged in the center of the cover plate (15), the central threaded column (14) is matched with a central threaded hole (7) of the top plate (6), and the cylindrical barrel structure is closed;
at least 8 solenoids (10) are installed in each arc-shaped insulating block (3) and are symmetrically arranged on two sides of the interlayer (9) respectively.
2. The device for measuring the compressive property of the expanded cement slurry by using the magnetic force as claimed in claim 1, wherein: the bottom end of the arc-shaped insulating block (3) is provided with a limiting skirt edge (13), and the limiting skirt edge (13) is matched with the bottom plate and limits the bottom plate; the top end of the arc-shaped insulating block (3) is provided with a first threaded hole (11).
3. The device for measuring the compressive property of the expanded cement slurry by using the magnetic force as claimed in claim 1, wherein: the sealing cover plate (5) is of an arc-shaped plate structure, a plurality of second threaded holes (12) are uniformly processed in the sealing cover plate (5), and the second threaded holes (12) are matched with first threaded holes (11) in the top of the arc-shaped insulating block (3).
4. The device for measuring the compressive property of the expanded cement slurry by using the magnetic force as claimed in claim 1, wherein: the inner walls of the bottom end and the top end of the arc-shaped insulating block (3) are provided with limiting skirt edges (13).
5. The device for measuring the compressive property of the expanded cement slurry by using the magnetic force as claimed in claim 1, wherein: the arc-shaped insulating blocks (3) are four in total and form the whole cylindrical barrel structure after being folded and combined.
6. A test method using the apparatus for measuring the compressive strength of an expanded cement slurry using magnetism according to any one of claims 1 to 5, characterized in that it comprises the following steps:
step 1: preparing materials required by the device, selecting four arc-shaped insulating blocks (3), and installing a solenoid (10) in each arc-shaped insulating block (3);
step 2: a pressure sensor is arranged on the inner wall of each arc-shaped insulating block (3);
step 3: selecting two arc-shaped insulating blocks (3) and assembling the two arc-shaped insulating blocks, after the assembly is finished, arranging a bottom plate on a limiting skirt edge (13) at the bottom in a limiting way, and arranging a top plate (6) at the top;
step 4: pasting double-sided adhesive tapes on the inner walls of the two assembled arc-shaped insulating blocks (3), pasting the double-sided adhesive tapes on the inner sides of the bottom plate and the top plate (6), then pasting a plastic film on the place where the double-sided adhesive tapes are pasted, pasting the double-sided adhesive tapes on the inner sides of the other two assembled arc-shaped insulating blocks (3), simultaneously pasting the plastic film, finally folding and combining the four arc-shaped insulating blocks (3) to form a whole cylindrical barrel structure, and extending an opening of the plastic film out of a central threaded hole (7) of the top plate (6);
step 5: sleeving a locking hoop component (4) at two ends of the cylindrical barrel structure and fixing the locking hoop component by using a bolt component (16);
step 6: selecting expanded cement slurries with different preparation ratios for filling: preparing 7 groups of cement slurries with different expanding agent contents for standby use according to experimental requirements, weighing 7 groups of cement with the label of 42.5 by using an electronic scale, weighing 1000g, 950g, 900g, 850g, 800g, 750g and 700g of the cement, weighing 0g, 50g, 100g, 150g, 200g, 250g and 300g of the expanding agent, weighing 7 groups of warm water, and mixing the 7 groups of cement, the expanding agent and the warm water in sequence to prepare the expansion with the expanding agent contents of 0, 5%, 10%, 15%, 20%, 25% and 30%;
step 7: firstly, a top plate (6) with a central threaded hole (7) is lifted to the top end of a cylindrical barrel structure by a hook, expanded cement paste is filled into the device from the central threaded hole (7), when the device is filled with the expanded cement paste, the thin film strip is sealed, the redundant part of the thin film strip is filled into the device, and then a cover plate (15) with a central threaded column and the central threaded hole (7) are twisted tightly;
step 8: maintaining under proper conditions, and recording readings of the four pressure sensors;
step 9: transferring the device to a laboratory for measuring the compressive strength after 28 days of maintenance, providing current for the solenoid (10) according to data displayed by the pressure sensor and taking the average of the data, continuously increasing the current until the expansion pressure of the expanded cement slurry recorded by the pressure sensor is reached, and keeping the current magnitude, namely maintaining the current expansion pressure;
step 10: and then the locking hoop assembly (4) is disassembled, a screw rod of the pressure testing machine is aligned to a top plate (6) of the cylindrical barrel structure, and the pressure testing machine is started to measure the compressive strength of the expansive cement paste under different expanding agent contents.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811393522.7A CN109580346B (en) | 2018-11-21 | 2018-11-21 | Device and method for measuring compressive resistance of expanded cement slurry by using magnetic force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811393522.7A CN109580346B (en) | 2018-11-21 | 2018-11-21 | Device and method for measuring compressive resistance of expanded cement slurry by using magnetic force |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109580346A CN109580346A (en) | 2019-04-05 |
| CN109580346B true CN109580346B (en) | 2021-08-10 |
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| CN110441147A (en) * | 2019-08-30 | 2019-11-12 | 湖南科技大学 | A kind of physical simulating device and analogy method of the compression of coal mine shaft lining borehole wall circumferential direction |
| CN112113759B (en) * | 2020-10-22 | 2023-08-25 | 江苏易恒自动化设备有限公司 | Verification equipment for pipe explosion protection device |
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Application publication date: 20190405 Assignee: Hubei Hongzhuo Architectural Design Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980043461 Denomination of invention: A device and method for measuring the compressive performance of expansive cement slurry using magnetic force Granted publication date: 20210810 License type: Exclusive License Record date: 20231019 |
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