CN210323027U - Corrugated pipe forming sleeve for cement-based material self-contraction test - Google Patents
Corrugated pipe forming sleeve for cement-based material self-contraction test Download PDFInfo
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- CN210323027U CN210323027U CN201921149643.7U CN201921149643U CN210323027U CN 210323027 U CN210323027 U CN 210323027U CN 201921149643 U CN201921149643 U CN 201921149643U CN 210323027 U CN210323027 U CN 210323027U
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Abstract
The utility model relates to a bellows shaping sleeve of cement-based material self-contraction test, including the base, the transparent drum that can unpack apart, transparent drum is cavity and both ends open-ended transparent drum, and transparent drum's whole length suits with bellows length, and the base is equipped with the recess, and transparent drum inserts and constitutes the combination sleeve in the recess, and the shape and the size of recess suit with transparent drum, and the base is equipped with and is used for dismantling the fixing device who connects in the cement concrete shaking table. The cement-based material forming and transferring integrated machine has the advantages that the cement-based material forming and transferring are integrated, one-step achievement is achieved, the cement-based material does not need to be transferred through an intermediate carrier after being formed, hands do not contact with the cement-based material completely, the cement-based material is stably placed on a test steel frame, bending and stretching deformation of the cement-based material in slurry filling and transferring processes is reduced, early influence on slurry microstructure is avoided, and errors between a self-contraction instrument test result and actual slurry contraction deformation are reduced.
Description
Technical Field
The utility model relates to a cement-based material is from shrink test field, especially relates to a cement-based material is from bellows shaping sleeve of shrink test.
Background
The cement is the most used building material in the world, the reaction of the cement involves a series of chemical reaction processes, and the cement generates materials with gelling property, such as calcium silicate hydrate, and the like, can firmly bond sand and stone together, and has mechanical strength. The cement can generate deformation in the early chemical reaction with water, wherein self-contraction refers to the phenomenon that the volume of slurry is reduced due to hydration reaction of the cement under the conditions that the cement-based material has no external force action, is at constant temperature and has no matter exchange with the outside. In concrete, when the cement paste is self-shrunk, the cement paste is restrained by coarse aggregate, and when the tensile stress generated by self-shrinkage is greater than the stress of the hardened paste, the test piece is cracked. The cracking of the material can accelerate the invasion of various harmful media (such as chloride ions, carbon dioxide, acid and alkali ions and the like) in the external environment, reduce the strength and rigidity of the material, and endanger the durability and the service life of the material. Therefore, accurately measuring the self-shrinkage of cement is of great significance in preventing early cracking of materials.
Methods of measuring self-contraction are roughly classified into a volume method and a length method. The principle of the volume method is that cement paste is put into a closed elastic rubber bag and then is immersed into water for weighing, and the volume shrinkage of the paste is calculated through the weight change. Although the volume method is used for measuring the self-shrinkage, the measurement can be carried out immediately after pouring, the measurement result is greatly influenced when the freshly mixed cement-based material is wrapped with bubbles, and in addition, the rubber bag filled with the slurry cannot completely ensure that water cannot permeate into the slurry through the rubber bag. The length method measures the self-shrinkage so as to avoid the defects of the volume method, and the length method is adopted by Chinese GBT50082-2009, American ASTM C490, ASTM C1698 and Japanese JIS A1129. However, these existing test standards have some drawbacks, such as the inability to start the self-shrinkage measurement immediately after the slurry casting is completed, and the inability to measure the magnitude of early self-shrinkage, and therefore the results of the self-shrinkage measurement are not accurate enough. The bellows method (ASTM C1698) has excellent tightness, can effectively prevent the slurry from exchanging substances with the external environment, and is a self-contraction measurement mode which is relatively accepted at present. The inventor of the utility model has reported "ZL 201721146432.9 a measure cement-based material self-constriction device", improved the bellows method, provided a high accuracy continuous measurement self-constriction device. In the test, the corrugated pipe sample is bent and stretched in the slurry filling and moving processes in the preparation process, so that the early microstructure is greatly influenced, the test repeatability is poor and the data fluctuation is high in the initial setting stage to the final setting stage. Especially in the filling process, because the slurry is filled into, the lower part of the corrugated pipe is too heavy to cause the stretching of the corrugated pipe, the artificial influence is too large, the slurry is not fully filled, air bubbles exist, and the test result is influenced. The above increases the error between the test result of the self-contraction instrument and the actual contraction deformation of the slurry, affects the test precision, and is not beneficial to correctly evaluating the volume stability of the slurry.
Disclosure of Invention
To the technical problem who exists among the prior art, the utility model aims at: the utility model provides a corrugated pipe shaping sleeve of cement-based material self-contraction test which can effectively avoid the error that corrugated pipe body caused by human hand contact buckles, stretches out and draws back in the self-contraction test.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a bellows shaping sleeve of cement-based material self-contraction test, includes the base, can unpack apart transparent drum, and transparent drum is cavity and both ends open-ended transparent drum, and transparent drum's whole length suits with bellows length, and the base is equipped with the recess, and transparent drum inserts and constitutes the combination sleeve in the recess, and the shape and the size of recess suit with transparent drum, and the base is equipped with and is used for dismantling the fixing device who connects in the cement concrete shaking table.
Further, the transparent cylinder comprises a left half cylinder, a right half cylinder and an elastic lock catch for fixing the left half cylinder and the right half cylinder, the left half cylinder and the right half cylinder are combined into the transparent cylinder, and the elastic lock catch is arranged at the contact position of the left half cylinder and the right half cylinder.
Further, fixing device is sheetmetal and magnet, and the sheetmetal rigid coupling is in the bottom of base, and magnet is used for adsorbing the sheetmetal on the surface of cement concrete shaking table.
Further, the base is a regular hexagonal prism with a cylindrical groove in the middle.
Further, the metal sheet is a regular hexagonal metal sheet.
Further, the depth of the cylindrical groove is larger than or equal to 10mm, the thickness of the side wall of the base is larger than or equal to 30mm, the thickness of the metal sheet is larger than or equal to 2mm, the overall height of the base is larger than or equal to 30mm, and the thickness of the side wall of the transparent cylinder is larger than or equal to 2 mm.
Further, the base and the transparent cylinder are made of hard plastics, and the elastic lock catch is made of hard plastics or metal materials.
A corrugated pipe forming sleeve for cement-based material self-contraction test,
(1) the cement-based material forming and transferring integrated machine has the advantages that the cement-based material forming and transferring are integrated, one-step achievement is achieved, the cement-based material does not need to be transferred through an intermediate carrier after being formed, hands do not contact with the cement-based material completely, the cement-based material is stably placed on the test steel frame, bending and stretching deformation of the cement-based material in slurry filling and transferring processes is reduced, influence on slurry microstructure in early stage is avoided, errors between a self-contraction instrument test result and actual slurry contraction deformation are reduced, and test precision is improved.
(2) The transparent cylinder facilitates direct observation of the slurry filling condition and the filling height, and the filling and the observation are carried out simultaneously, thereby being beneficial to filling cement-based materials and reducing experimental errors.
(3) The base with the metal sheet can be connected with the magnetism of the vibration table, the vibration process is free from manual fixation, the forming effect of the cement-based material is improved, the adverse effect of air bubbles on testing is effectively eliminated, the generation of the air bubbles is reduced, and the experimental error is reduced.
Drawings
Fig. 1 is a schematic view of a three-dimensional structure of a corrugated pipe forming sleeve for a cement-based material self-contraction test of the present invention.
Fig. 2 is the split structure schematic diagram of the corrugated pipe forming sleeve for the cement-based material self-contraction test of the present invention.
Fig. 3 is a schematic structural view of another angle of the transparent cylinder of the bellows forming sleeve for testing the self-contraction of the cement-based material of the present invention.
Fig. 4 is a schematic structural diagram of a usage state of the corrugated pipe forming sleeve for the self-contraction test of the cement-based material of the present invention.
Wherein fig. 1 to 4 include:
1-base, 11-metal sheet, 12-groove, 2-transparent cylinder 21-left semi-cylinder, 22-right semi-cylinder, 23-elastic lock catch, 3-corrugated pipe.
Detailed Description
The present invention will be described in further detail below.
As shown in fig. 1 to 4, a corrugated pipe forming sleeve for cement-based material self-contraction test comprises a regular hexagonal prism base 1 with a cylindrical groove 12 in the middle and a transparent cylinder 2 capable of being disassembled, wherein the transparent cylinder 2 comprises a left half cylinder 21, a right half cylinder 22 and an elastic lock catch 23 for fixing the left half cylinder 21 and the right half cylinder 22, the left half cylinder 21 and the right half cylinder 22 are combined into the transparent cylinder 2, and the elastic lock catch 23 is arranged at the contact position of the left half cylinder 21 and the right half cylinder 22, and the total number of the elastic lock catches is two.
The fixing device is a metal sheet 11 and a magnet, the metal sheet 11 is fixedly connected to the bottom of the base 1, and the magnet is used for adsorbing the metal sheet 11 to the surface of the cement concrete vibrating table. The metal sheet 11 is a regular hexagonal metal sheet.
The depth of the cylindrical groove 12 is equal to 10mm, the thickness of the side wall of the base 1 is equal to 30mm, the thickness of the metal sheet 11 is equal to 2mm, the overall height of the base 1 is equal to 30mm, and the thickness of the side wall of the transparent cylinder 2 is equal to 2 mm. The base 1 and the transparent cylinder 2 are made of hard plastics, and the elastic lock 23 is made of hard plastics or metal materials.
A method for forming a corrugated pipe forming sleeve for a cement-based material self-contraction test comprises the following steps,
(1) the transparent cylinder 2 is inserted into the groove 12 of the base 1 to form a combined sleeve;
(2) placing the combined sleeve on a table top of a cement concrete shaking table and fixedly connecting the combined sleeve with the table top;
(3) the opening of the corrugated pipe 3 with one end sealed is upwards put into the transparent cylinder 2 of the combined sleeve, the cement concrete vibration table is opened, and cement fresh slurry is poured while vibration is carried out.
Further, the method comprises the following specific steps of,
(1) inserting the transparent cylinder 2 into the groove 12 of the base 1, so that the transparent cylinder 2 is fixed and embedded in the groove 12 of the base 1, the bottom surface of the groove 12 is contacted with the bottom of the groove 12, the combined sleeve is placed on the table top of the cement concrete vibrating table, and the metal sheet 11 of the base 1 is connected with the table top of the cement concrete vibrating table with the magnet;
(2) put into combination telescopic transparent drum 2 up with 3 openings of bellows that one end was sealed, prepare cement fresh slurry, start the cement concrete shaking table, slowly pour cement fresh slurry into bellows 3 in, can adopt the funnel, pour into the vibration of in-process cement concrete shaking table, reduce the speed of irritating, make and pour into the slurry and fully fill bellows 3, avoid the bubble to produce, when cement fresh slurry fills to bellows 3 mould surplus 30mm height, stop the vibration of cement concrete shaking table, slowly fill in bellows 3 with the heliciform with the plastics stopper, make plastics chock plug and slurry fully contact, and seal up plastics stopper and 3 seams of bellows with the fast glue.
(3) Taking down the combined sleeve filled with the bellows 3 sample from the vibrating table, moving the combined sleeve to be transversely arranged above the self-contraction test frame, dismantling the base 1 of the combined sleeve, pressing the elastic lock catch 23 of the transparent cylinder 2, slowly placing the bellows 3 sample on the self-contraction test frame, fixing one end of the bellows 3, and enabling the other end of the bellows to be in contact with the displacement sensor.
(4) And fixing the position of the displacement sensor to align the displacement sensor to the central position of the plastic plug at the test end of the corrugated pipe 3, and starting the self-contraction test of the cement-based material.
Further, in order to ensure that the whole test is not affected by temperature, the whole set of device should be placed in a thermostatic chamber; or placed in a constant temperature oil bath.
In general, the utility model has the advantages as follows:
a corrugated pipe forming sleeve for cement-based material self-contraction test,
(1) the cement-based material forming and transferring integrated machine has the advantages that the cement-based material forming and transferring are integrated, one-step achievement is achieved, the cement-based material does not need to be transferred through an intermediate carrier after being formed, hands do not contact with the cement-based material completely, the cement-based material is stably placed on the test steel frame, bending and stretching deformation of the cement-based material in slurry filling and transferring processes is reduced, influence on slurry microstructure in early stage is avoided, errors between a self-contraction instrument test result and actual slurry contraction deformation are reduced, and test precision is improved.
(2) The transparent cylinder 2 facilitates direct observation of the slurry filling condition and the filling height, and the filling and the observation are carried out simultaneously, thereby being beneficial to filling cement-based materials and reducing experimental errors.
(3) The base 1 with the metal sheet 11 can be connected with the magnetism of the vibration table, the vibration process does not need to be fixed by hands, the forming effect of the cement-based material is improved, the adverse effect of air bubbles on testing is effectively eliminated, the generation of the air bubbles is reduced, and the experimental error is reduced.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (7)
1. The utility model provides a bellows shaping sleeve of cement-based material self contraction test which characterized in that: including the base, can unpack apart transparent drum, transparent drum is cavity and both ends open-ended transparent drum, and transparent drum's whole length suits with bellows length, and the base is equipped with the recess, and transparent drum inserts and constitutes the combination sleeve in the recess, and the shape and the size of recess suit with transparent drum, and the base is equipped with and is used for dismantling the fixing device who connects in the cement concrete shaking table.
2. A cement-based material self-contraction test bellows-forming sleeve according to claim 1, wherein: the transparent cylinder comprises a left half cylinder, a right half cylinder and an elastic lock catch for fixing the left half cylinder and the right half cylinder, the left half cylinder and the right half cylinder are combined into the transparent cylinder, and the elastic lock catch is arranged at the contact position of the left half cylinder and the right half cylinder.
3. A cement-based material self-contraction test bellows-forming sleeve according to claim 1, wherein: the fixing device is a metal sheet and a magnet, the metal sheet is fixedly connected to the bottom of the base, and the magnet is used for adsorbing the metal sheet on the surface of the cement concrete vibrating table.
4. A cement-based material self-contraction tested bellows forming sleeve according to claim 3, wherein: the base is a regular hexagonal prism with a cylindrical groove in the middle.
5. A cement-based material self-contraction test bellows-forming sleeve according to claim 4, wherein: the metal sheet is a regular hexagon metal sheet.
6. A cement-based material self-contraction test bellows-forming sleeve according to claim 4, wherein: the depth of the cylindrical groove is greater than or equal to 10mm, the thickness of the side wall of the base is greater than or equal to 30mm, the thickness of the metal sheet is greater than or equal to 2mm, the overall height of the base is greater than or equal to 30mm, and the thickness of the side wall of the transparent cylinder is greater than or equal to 2 mm.
7. A cement-based material self-contraction test bellows-forming sleeve according to claim 1, wherein: the base and the transparent cylinder are made of hard plastics, and the elastic lock catch is made of hard plastics or metal materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921149643.7U CN210323027U (en) | 2019-07-19 | 2019-07-19 | Corrugated pipe forming sleeve for cement-based material self-contraction test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921149643.7U CN210323027U (en) | 2019-07-19 | 2019-07-19 | Corrugated pipe forming sleeve for cement-based material self-contraction test |
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| CN210323027U true CN210323027U (en) | 2020-04-14 |
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| CN201921149643.7U Active CN210323027U (en) | 2019-07-19 | 2019-07-19 | Corrugated pipe forming sleeve for cement-based material self-contraction test |
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