CN109521187B - Device and method for detecting self-shrinkage of cement paste - Google Patents
Device and method for detecting self-shrinkage of cement paste Download PDFInfo
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- CN109521187B CN109521187B CN201811470103.9A CN201811470103A CN109521187B CN 109521187 B CN109521187 B CN 109521187B CN 201811470103 A CN201811470103 A CN 201811470103A CN 109521187 B CN109521187 B CN 109521187B
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- 239000004568 cement Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000007790 scraping Methods 0.000 claims abstract description 43
- 238000012360 testing method Methods 0.000 claims abstract description 20
- 230000007246 mechanism Effects 0.000 claims abstract description 18
- 238000004321 preservation Methods 0.000 claims abstract description 16
- 238000009413 insulation Methods 0.000 claims description 55
- 238000001035 drying Methods 0.000 claims description 7
- 238000010998 test method Methods 0.000 claims description 6
- 239000006260 foam Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 13
- 238000005266 casting Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000004567 concrete Substances 0.000 description 6
- 229910021487 silica fume Inorganic materials 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000010365 information processing Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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- Ceramic Engineering (AREA)
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Abstract
The invention discloses a device and a method for detecting cement paste self-contraction, comprising a pouring mechanism, a sliding mechanism, a connecting mechanism, a testing system and a heat preservation system. The pouring mechanism comprises a movable pouring die, a cavity, a scraping plate, a sleeve and a sponge block; the sliding mechanism comprises a T-shaped chute, a T-shaped sliding block and a sliding rod; the connecting mechanism comprises a fixed block, a bolt, a connecting plate and a rotating rod; the test system comprises a pressure sensor, a convex strip and an external display port; the heat preservation system comprises a heat preservation box, a thermocouple, an air box and a through port. The invention mainly detects high-strength cement paste, and carries out an automatic detection program after setting temperature and wind speed parameters, and the invention has the advantages of convenient use, novel design and portability, can directly process the data of the internal pressure sensor, ensures that the data is not really influenced by other factors, and can be directly disassembled for cleaning after the test is finished, thereby being very fast and convenient.
Description
Technical Field
The invention relates to the technical field of cement-based material performance test, in particular to a device and a method for detecting cement paste self-shrinkage.
Background
Early cracking of cast-in-situ cement concrete is a common problem in engineering. In recent years, with the wide application of high-strength high-performance concrete, the water-cement ratio is also lower and lower, so that the problem of self shrinkage of cement paste becomes more serious. Therefore, how to reduce the self-shrinkage problem of cement slurries, especially early self-shrinkage, has become critical to reduce cracking and improve durability performance of the structure. For high-strength concrete, the cement paste is large in dosage and the water gel is low, so that self-shrinkage cannot be ignored, under the condition that deformation is restrained, self-shrinkage, drying shrinkage and temperature shrinkage are all main causes for early cracking of the concrete, and the main factors for generating the shrinkage are the hydration process of the cementing material. At present, there is no unified standard for measuring the self-shrinkage of the cement slurry, and most of the measuring methods are to measure from external deformation and displacement, and cannot truly reflect the internal shrinkage rule, so it is necessary to design a testing device capable of continuously measuring the internal shrinkage condition of the cement slurry.
Disclosure of Invention
In order to solve the above problems, the present invention provides a device and a method for detecting the self shrinkage of cement paste.
The invention is realized by the following technical scheme:
the invention provides a device for detecting cement paste self-contraction, which comprises a pouring mechanism, a sliding mechanism, a connecting mechanism, a testing system and a heat preservation system, wherein the pouring mechanism comprises a movable pouring die, a cavity, two scraping plates, a sleeve and a sponge block; the sliding mechanism comprises two T-shaped sliding grooves, two T-shaped sliding blocks and a sliding rod; the connecting mechanism comprises a fixed block, two bolts, a connecting plate and a rotating rod; the test system comprises a pressure sensor and a convex strip; the heat preservation system comprises a heat preservation box, a thermocouple, an air box and a through port;
the movable pouring mold comprises a movable pouring mold body, wherein handles are symmetrically fixed on two sides of the top surface of the movable pouring mold body, a convex strip is fixedly connected to one inner side wall of the movable pouring mold body, a plurality of pressure sensors are distributed on the convex strip, one ends of two sides of the movable pouring mold body are respectively inserted into an insulation box through openings, thermocouples are respectively arranged on two sides of the movable pouring mold body positioned in the insulation box, the top end and the bottom end of each thermocouple are respectively fixedly connected with the inner top surface and the inner bottom surface of the insulation box, bellows are symmetrically fixed on two sides of the bottom end of the insulation box, a cavity is formed in the bottom wall of the insulation box, the cavity is communicated with the bellows through a plurality of first through holes, and the cavity is communicated with the inside of the insulation box through a plurality of second through holes; the two sides of the outer wall of the insulation box are symmetrically provided with fixed blocks, first bolts are connected to the fixed blocks in a threaded manner, sliding rods are connected to the fixed blocks in a sliding manner, the bottom ends of the sliding rods penetrate through bottom surfaces of the fixed blocks to be fixedly connected with stop blocks, the top ends of the two sliding rods penetrate through the top surfaces of the fixed blocks to be fixedly connected with first scraping plates, the first scraping plates are positioned between the two sliding rods, one side of each first scraping plate is attached to the side wall of the movable pouring mold, a second T-shaped sliding groove is formed in the top surface of each first scraping plate, a second T-shaped sliding block is connected to the second T-shaped sliding groove in a sliding manner, the top ends of the second T-shaped sliding blocks penetrate through the second T-shaped sliding grooves to be fixedly connected with second scraping plates, and the top surfaces of the first scraping plates are attached to each other; the utility model discloses a thermal insulation box, including insulation box, first T type spout fixedly connected with motor are worn out to the one end of first T type spout, pass through connecting plate fixed connection between two motors, be equipped with a plurality of second bolt on the connecting plate and pass through threaded connection with it, the output fixedly connected with rotary rod of every motor, the cover has three sleeve and rather than fixed connection on the rotary rod, all the cover has the sponge piece and rather than fixed connection on the sleeve, a plurality of sponge piece is located between first scraper blade and the insulation box.
In the invention, the width of the first scraping plate is smaller than the width of the second scraping plate by 3-5 cm.
In the invention, the electric fan and the thermocouple are respectively connected with an external switch, and the electric fan and the thermocouple are controlled by the external switch together.
In the invention, an external display port is fixed on the top surface of the movable pouring die between two handles, and an external display port is also arranged on the convex strip.
In the invention, the insulation box is wrapped with the insulation film and internally provided with the foam layer.
In the invention, the motor is connected with an external power supply.
The invention provides a testing method for detecting a cement paste self-shrinkage device, which comprises the following steps:
(1) Preparing high-strength cement paste, opening a motor, pouring the newly mixed high-strength cement paste into a movable pouring mold, and slightly vibrating until no large bubbles emerge from the surface;
(2) After pouring is finished, the motor is closed, the cement paste obtained in the step (1) is pushed into the insulation box by pushing the handle, the first scraping plate and the second scraping plate are utilized to scrape the redundant cement paste, and the wet towel is used to erase the redundant paste outside the device;
(3) The motor is turned on, the sleeve fixedly connected to the rotary rod is driven to rotate by the motor, so that the sponge block rotates, the top surface of the side wall of the movable pouring die is wiped, cement adhered to the side wall of the movable pouring die is further wiped, and the side wall of the movable pouring die entering the insulation box is ensured to be kept clean;
(4) After the movable pouring die is pushed into the heat insulation box, a first T-shaped sliding block in the first T-shaped sliding groove is slid, so that the second scraping plate is driven to slide on one side of the first scraping plate, and cement adhered on the first scraping plate is hung off;
(5) The method comprises the steps of placing a self-shrinkage device for detecting cement paste at a horizontal drying position, and changing the temperature and the wind speed in a movable pouring die by adjusting a thermocouple and two wind boxes;
(6) And recording the dry shrinkage pressure change values of the test piece at each age by using the pressure sensors distributed on the convex strips.
According to the invention, after the testing work is completed, the second bolt is screwed, the motor of the second bolt slides on the insulation box, the sponge block and the sleeve on the rotary rod are driven to move to one side surface of the insulation box, the second bolt is used for fixing the sponge block and the sleeve, the first bolt is screwed again, the sliding rod in the fixing block slides, and the first scraping plate is driven to be attached to the side wall of the insulation box for fixing.
Preferably, the sponge block is a rectangular block.
Preferably, the electric fan and the thermocouple are controlled together by an external control device.
Preferably, the movable pouring die is connected with the convex strip for analysis by an external information processing system.
Preferably, when the sponge block is horizontal, the bottom surface of the sponge block is not attached to the top surface of the side wall of the movable pouring die, when the sponge block is vertical, the bottom surface of the sponge block is lower than the top surface of the side wall of the movable pouring die by 2-3 cm, and when the sponge block rotates, the sponge block is tightly attached to the top surface of the side wall of the movable pouring die.
Preferably, the amount of cement added into the movable casting mold is about 0.7V-0.8V of the movable casting mold, wherein V is the movable casting mold.
Preferably, when in use, 4/5 of the mobile casting mold volume is outside the incubator.
Compared with the prior art, the invention has the beneficial effects that: can effectually hang unnecessary cement of pouring through first scraper blade, avoid unnecessary cement to glue on the insulation can inside wall and glue its portable pouring mould, the convenience of using next time is guaranteed smoothly, sponge piece rotation produces the cleaning to portable pouring mould's lateral wall top surface simultaneously, further ensure to enter into the portable pouring mould lateral wall of insulation can and keep clean, do not have the water sediment to influence portable pouring mould's slip in the insulation can, wait after the work is accomplished, can remove the sponge piece and the sleeve on the rotary rod to on the insulation can side, and first scraper blade and insulation can lateral wall laminating, so the convenience device is laid, the effectual occupation of land space that reduces also avoids the scratch simultaneously, and this device can directly handle the data of inside pressure sensor, guarantee that the data is truly not influenced by other factors, simultaneously after the test is accomplished, can directly dismantle the clearance, very swiftly convenient.
Drawings
FIG. 1 is a schematic illustration of the structure of the present invention;
FIG. 2 is a partial schematic view of the structure of the present invention;
FIG. 3 is an enlarged view of a portion of the structure of the present invention;
FIG. 4 is a partial bottom view of the structure of the present invention;
FIG. 5 is a partial exterior view of the structure of the present invention;
reference numerals in the drawings: the casting mold comprises a movable casting mold 1, an external display port 2, a pressure sensor 3, a thermocouple 4, an incubator 5, a bellows 6, an electric fan 7, an air outlet 8, a first through hole 9, a cavity 10, a second through hole 11, a first T-shaped chute 12, a stop 13, a fixed block 14, a first bolt 15, a first T-shaped slide block 16, a connecting plate 17, a second bolt 18, a motor 19, a rotating rod 20, a sponge block 21, a sleeve 22, a slide bar 23, a first scraping plate 24, a second T-shaped chute 25, a handle 26, a second T-shaped slide block 27, a second scraping plate 28, a through hole 29 and a convex strip 30.
Description of the embodiments
The invention is described in further detail below with reference to the attached drawings and detailed description:
example 1: as shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, a device and a method for detecting cement paste self-shrinkage comprise a movable pouring die 1, handles 26 are symmetrically and fixedly connected to two sides of the top surface of the movable pouring die 1, an external display port 2 is fixedly connected to the top surface of the movable pouring die 1 between the two handles 26, a convex strip 30 is fixedly connected to one inner side wall of the movable pouring die 1, a pressure sensor 3 is fully distributed on the convex strip 30, one end of the movable pouring die 1 is inserted into an insulation box 5 through a through port 29, thermocouples 4 are arranged on two sides of the movable pouring die 1 in the insulation box 5, the top end and the bottom end of each thermocouple 4 are respectively and fixedly connected with the inner top surface and the inner bottom surface of the insulation box 5, two bellows 6 are symmetrically and fixedly connected to two sides of the bottom end of the insulation box 5, an electric fan 7 is fixedly installed in the bellows 6, the bottom wall of the insulation box 5 is provided with a cavity 10, the cavity 10 is communicated with the bellows 6 through a plurality of first through holes 9, the cavity 10 is communicated with the inside of the insulation box 5 through a plurality of second through holes 11, both sides of the insulation box 5 are fixedly connected with a fixed block 14, the fixed block 14 is connected with a first bolt 15 in a threaded manner, a sliding rod 23 is slidably connected in the fixed block 14, the bottom ends of the sliding rods 23 penetrate through the bottom surface of the fixed block 14 and are fixedly connected with a stop block 13, the top ends of the two sliding rods 23 penetrate through the top surface of the fixed block 14 and are fixedly connected with the same first scraping plate 24, the first scraping plate 24 is arranged between the two sliding rods 23, one side of the first scraping plate 24 is attached to the side wall of the movable pouring die 1, the top surface of the first scraping plate 24 is provided with a second T-shaped sliding groove 25, the second T-shaped sliding groove 25 is slidably connected with a second T-shaped sliding block 27, the top of second T type slider 27 wears out second T type spout 25 fixedly connected with second scraper blade 28, second scraper blade 28 is laminated with first scraper blade 24 top surface, be equipped with first T type spout 12 outward on one side wall of insulation can 5, first T type spout 12 sliding connection has first T type slider 16, first T type spout 12 fixedly connected with motor 19 is worn out to one end of first T type slider 16, through connecting plate 17 fixed connection between two motors 19, be equipped with a plurality of second bolts 18 on the connecting plate 17 and with its threaded connection, the output fixedly connected with rotary rod 20 of motor 19, the cover has three sleeve 22 and rather than fixed connection on the rotary rod 20, all the cover has sponge piece 21 and rather than fixed connection on the sleeve 22, a plurality of sponge piece 21 is between first scraper blade 24 and insulation can 5.
The sponge block 21 is a rectangular block.
The electric fan 7 and the thermocouple 4 are controlled by an external control device.
The heat preservation box 5 is wrapped with a heat preservation film outside, and a foam layer is clamped inside.
The movable pouring die 1 and the convex strip 30 are connected with an external information processing system for analysis.
The width of the first scraping plate 24 is smaller than the width of the second scraping plate 28 by 3-5 cm.
When the sponge block 21 is horizontal, the bottom surface of the sponge block 21 is not attached to the top surface of the side wall of the movable casting mold 1, when the sponge block 21 is vertical, the bottom surface of the sponge block 21 is lower than the top surface of the side wall of the movable casting mold 1 by 2 cm-3 cm, and when the sponge block 21 rotates, the sponge block 21 is tightly attached to the top surface of the side wall of the movable casting mold 1.
The amount of cement added into the movable pouring die 1 is about 0.7V-0.8V of the volume of the movable pouring die 1, wherein V is the volume of the movable pouring die 1.
When in use, 4/5 of the volume of the mobile casting mould 1 is outside the incubator 5.
Working principle: when the invention is used, the motor 19 is firstly connected with an external power supply, then cement paste is poured into the movable pouring mould 1, after pouring is completed, the cement paste is pushed into the heat insulation box 5 by pushing the handle 26, in the pushing process, the top surface of the movable pouring mould 1 is tightly attached to the bottom surface of the first scraping plate 24, the excessive cement can be effectively hung off, the excessive cement is prevented from being adhered to the inner side wall of the heat insulation box 5, the movable pouring mould 1 and the heat insulation box 5 are adhered by the cement when being used next time, the movable pouring mould 1 in the heat insulation box 5 is pulled out again, so that the excessive cement is hung off when being poured by the first scraping plate 24, the convenience and smoothness of the next time use are effectively ensured, meanwhile, the motor 19 is opened, the sleeve 22 fixedly connected on the rotary rod 20 is driven to rotate, the sponge block 21 is enabled to rotate to generate wiping action on the top surface of the side wall of the movable pouring mould 1, further wiping off cement adhered to the side wall of the movable pouring die 1, ensuring that the side wall of the movable pouring die 1 entering the heat preservation box 5 is kept clean, preventing cement from affecting the sliding of the movable pouring die 1 in the heat preservation box 5, after the movable pouring die 1 is pushed into the heat preservation box 5, sliding a second T-shaped sliding block 27 in a second T-shaped sliding groove 25, further driving a second scraper 28 to slide on one side of the first scraper 24, hanging off cement adhered to the first scraper 24, avoiding difficult cleaning on the upper surface, opening a switch of a thermocouple 4 and an electric fan 7, drying the cement inside, discharging gas generated by drying through an air outlet hole 8, sensing the drying condition of the cement inside through a pressure sensor 3 on a convex strip 30, and then transmitting the gas into an external information processing system for analysis, after the work is finished, the second bolt 18 is screwed, the motor 19 of the second bolt slides on the heat insulation box 5, the sponge block 21 and the sleeve 22 on the rotary rod 20 are driven to move to one side surface of the heat insulation box 5, the second bolt 18 is used for fixing the second bolt, the first bolt 15 is screwed, the sliding rod 23 in the fixed block 14 is slid, and the first scraping plate 24 is driven to be attached to the side wall of the heat insulation box 5 for fixing, so that the device is convenient to place, occupied space is effectively reduced, and meanwhile scraping is avoided.
Example 2:
when the invention is used, the structure shown in figure 1 is installed and connected, and the specific measurement steps are as follows:
preparing common high-strength cement paste: mixing and stirring the P.O52.5 cement and water according to a certain proportion, wherein the specific mixing amount is as follows:
(1) cementing material: P.O52.5 Cement
(2) Water-cement ratio: 0.24
(3) Additive: 1.5% high-efficiency water reducing agent
The detection steps are as follows:
(1) The prepared slurry was poured into the mobile casting mold 1, the control switch was started, the thermocouple 4 was turned on, and the temperature was controlled to 20 ℃, the two bellows 6 were turned on, and the speed was maintained at 180 rpm.
(2) And standing the device at a horizontal drying position, automatically storing data in the test process by an external information processing system, and generating an analysis chart of each parameter.
(3) And cleaning the device in time after the test is finished, and turning off the power supply.
In order to detect whether the measurement rule of the device is accurate, the high-strength cement paste is prepared in a laboratory by adopting the same material proportion, and is tested according to the Highway engineering cement and cement concrete test procedure, the test rule is the same, but the device has higher sensitivity and higher precision than the traditional method.
Example 3:
nano SiO 2 Preparing high-strength cement paste: a certain amount of nano SiO 2 The high-strength cement-based material is mixed and stirred, and the specific mixing amount is as follows:
(1) cementing material: 1% nano SiO 2 99% P.O 52.5 cement
(2) Water-cement ratio: 0.24
(3) Additive: 1.5% high-efficiency water reducing agent
The detection procedure of this example was the same as that of example 2.
In order to detect whether the measurement rule of the device is accurate, the high-strength cement paste is prepared in a laboratory by adopting the same material proportion, and is tested according to the Highway engineering cement and cement concrete test procedure, the test rule is the same, but the device has higher sensitivity and higher precision than the traditional method.
Example 4:
and (3) preparing the silica fume high-strength cement paste: a certain amount of silica fume is highly doped into a high-strength cement-based material, and is mixed and stirred, wherein the specific doping amount is as follows:
(1) cementing material: 8% of silica fume and 92% of P.O 52.5 cement
(2) Water-cement ratio: 0.24
(3) Additive: 1.5% high-efficiency water reducing agent
The detection procedure of this example was the same as that of example 2.
In order to detect whether the measurement rule of the device is accurate, the high-strength cement paste is prepared in a laboratory by adopting the same material proportion, and is tested according to the Highway engineering cement and cement concrete test procedure, the test rule is the same, but the device has higher sensitivity and higher precision than the traditional method.
Example 5:
preparing the fly ash and silica fume high-strength cement slurry: a certain amount of fly ash and silica fume are highly doped into a high-strength cement-based material, and are mixed and stirred, wherein the specific doping amount is as follows:
(1) cementing material: 8% of silica fume, 20% of fly ash and 92% of P.O 52.5 cement
(2) Water-cement ratio: 0.24
(3) Additive: 1.5% high-efficiency water reducing agent
The detection procedure of this example was the same as that of example 2.
In order to detect whether the measurement rule of the device is accurate, the high-strength cement paste is prepared in a laboratory by adopting the same material proportion, and is tested according to the Highway engineering cement and cement concrete test procedure, the test rule is the same, but the device has higher sensitivity and higher precision than the traditional method.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The device for detecting the cement paste self-contraction is characterized by comprising a pouring mechanism, a sliding mechanism, a connecting mechanism, a testing system and a heat preservation system, wherein the pouring mechanism comprises a movable pouring die, a cavity, two scraping plates, a sleeve and a sponge block; the sliding mechanism comprises two T-shaped sliding grooves, two T-shaped sliding blocks and a sliding rod; the connecting mechanism comprises a fixed block, two bolts, a connecting plate and a rotating rod; the test system comprises a pressure sensor and a convex strip; the heat preservation system comprises a heat preservation box, a thermocouple, an air box and a through port;
the movable pouring mold comprises a movable pouring mold body, wherein handles are symmetrically fixed on two sides of the top surface of the movable pouring mold body, a convex strip is fixedly connected to one inner side wall of the movable pouring mold body, a plurality of pressure sensors are distributed on the convex strip, one ends of two sides of the movable pouring mold body are respectively inserted into an insulation box through openings, thermocouples are respectively arranged on two sides of the movable pouring mold body positioned in the insulation box, the top end and the bottom end of each thermocouple are respectively fixedly connected with the inner top surface and the inner bottom surface of the insulation box, bellows are symmetrically fixed on two sides of the bottom end of the insulation box, a cavity is formed in the bottom wall of the insulation box, the cavity is communicated with the bellows through a plurality of first through holes, and the cavity is communicated with the inside of the insulation box through a plurality of second through holes; the two sides of the outer wall of the insulation box are symmetrically provided with fixed blocks, first bolts are connected to the fixed blocks in a threaded manner, sliding rods are connected to the fixed blocks in a sliding manner, the bottom ends of the sliding rods penetrate through bottom surfaces of the fixed blocks to be fixedly connected with stop blocks, the top ends of the two sliding rods penetrate through the top surfaces of the fixed blocks to be fixedly connected with first scraping plates, the first scraping plates are positioned between the two sliding rods, one side of each first scraping plate is attached to the side wall of the movable pouring mold, a second T-shaped sliding groove is formed in the top surface of each first scraping plate, a second T-shaped sliding block is connected to the second T-shaped sliding groove in a sliding manner, the top ends of the second T-shaped sliding blocks penetrate through the second T-shaped sliding grooves to be fixedly connected with second scraping plates, and the top surfaces of the first scraping plates are attached to each other; a first T-shaped sliding groove is symmetrically formed in the outer side of one side wall of the heat preservation box, a first T-shaped sliding block is connected in the first T-shaped sliding groove in a sliding mode, one end of the first T-shaped sliding block penetrates out of the first T-shaped sliding groove to be fixedly connected with a motor, the two motors are fixedly connected through a connecting plate, a plurality of second bolts are arranged on the connecting plate and are in threaded connection with the connecting plate, the output end of each motor is fixedly connected with a rotating rod, three sleeves are sleeved on the rotating rods and are fixedly connected with the rotating rods, sponge blocks are sleeved on the sleeves and are fixedly connected with the sleeves, and a plurality of sponge blocks are positioned between the first scraping plate and the heat preservation box; the width of the first scraping plate is 3-5 cm smaller than that of the second scraping plate; the electric fan and the thermocouple are connected with an external switch respectively, and the electric fan and the thermocouple are controlled by the external switch together.
2. A device for detecting cement paste self-shrinkage according to claim 1, wherein: the top surface of the movable pouring die positioned between the two handles is fixed with an external display port, and the convex strip is also provided with an external display port.
3. A device for detecting cement paste self-shrinkage according to claim 1, wherein: the insulation box is wrapped with an insulation film, and a foam layer is clamped inside the insulation box.
4. A device for detecting cement paste self-shrinkage according to claim 1, wherein: the motor is connected with an external power supply.
5. A test method for detecting cement paste self-shrinkage device according to claim 1, comprising the steps of:
(1) Preparing high-strength cement paste, opening a motor, pouring the newly mixed high-strength cement paste into a movable pouring mold, and slightly vibrating until no large bubbles emerge from the surface;
(2) After pouring is finished, the motor is closed, the cement paste obtained in the step (1) is pushed into the insulation box by pushing the handle, the redundant cement paste is scraped by the first scraping plate, and the redundant paste outside the device is erased by the wet towel;
(3) The motor is turned on, the sleeve fixedly connected to the rotary rod is driven to rotate by the motor, so that the sponge block rotates, the top surface of the side wall of the movable pouring die is wiped, cement adhered to the side wall of the movable pouring die is further wiped, and the side wall of the movable pouring die entering the insulation box is ensured to be kept clean;
(4) When the movable pouring die is pushed into the heat insulation box, a second T-shaped sliding block in the second T-shaped sliding groove slides, so that the second scraping plate is driven to slide on one side of the first scraping plate, and cement adhered on the first scraping plate is hung off;
(5) The method comprises the steps of placing a self-shrinkage device for detecting cement paste at a horizontal drying position, and changing the temperature and the wind speed in a movable pouring die by adjusting a thermocouple and two wind boxes;
(6) And recording the dry shrinkage pressure change values of the test piece at each age by using the pressure sensors distributed on the convex strips.
6. The test method according to claim 5, wherein: after the test work is finished, the second bolt is screwed, the motor of the second bolt slides on the insulation box, the sponge block and the sleeve on the rotary rod are driven to move to one side surface of the insulation box, the second bolt is used for fixing the sponge block and the sleeve, the first bolt is screwed again, the sliding rod in the fixing block slides, and then the first scraping plate is driven to be attached to the side wall of the insulation box for fixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811470103.9A CN109521187B (en) | 2018-12-04 | 2018-12-04 | Device and method for detecting self-shrinkage of cement paste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811470103.9A CN109521187B (en) | 2018-12-04 | 2018-12-04 | Device and method for detecting self-shrinkage of cement paste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109521187A CN109521187A (en) | 2019-03-26 |
| CN109521187B true CN109521187B (en) | 2024-04-02 |
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| CN109521187A (en) | 2019-03-26 |
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