CN220104611U - Device for rapidly evaluating shrinkage restraining performance of cement-based material - Google Patents
Device for rapidly evaluating shrinkage restraining performance of cement-based material Download PDFInfo
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- CN220104611U CN220104611U CN202321584056.7U CN202321584056U CN220104611U CN 220104611 U CN220104611 U CN 220104611U CN 202321584056 U CN202321584056 U CN 202321584056U CN 220104611 U CN220104611 U CN 220104611U
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- 239000000463 material Substances 0.000 title claims abstract description 62
- 239000004568 cement Substances 0.000 title claims abstract description 61
- 230000000452 restraining effect Effects 0.000 title description 7
- 238000011156 evaluation Methods 0.000 claims description 9
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 35
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 238000005336 cracking Methods 0.000 description 17
- 239000003973 paint Substances 0.000 description 6
- 239000011083 cement mortar Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 3
- 238000004154 testing of material Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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- Sampling And Sample Adjustment (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a device for rapidly evaluating the shrinkage restraint performance of cement-based materials, which relates to the technical field of cement-based material performance index measuring instruments, and comprises the following components: bottom plate, inner ring and outer ring, the inner ring is fixed to be set up on the bottom plate, the inner ring includes interior semicircle ring and semicircle ring, the both ends of semicircle ring respectively with the both ends integral type fixed connection of semicircle ring, the outer ring is used for placing on the bottom plate and with interior semicircle ring's axial lead collineation setting, shorten test period, improve cement-based material's fracture sensitivity, also can control cracked fracture position simultaneously better, can observe the cracked condition of test piece directly perceivedly, the convenient crack width that measures, so as to reflect cement-based material's shrink fracture performance more truly.
Description
Technical Field
The utility model relates to the technical field of cement-based material performance index measuring instruments, in particular to a device for rapidly evaluating the shrinkage restraining performance of cement-based materials.
Background
The cement-based material has been widely used in the fields of civil engineering and construction engineering due to its characteristics of good plasticity, excellent durability, easily available raw materials, etc. However, since the cement-based material is often in service in a complex environment, volumetric deformation is easy to generate under the dual actions of load and environment, self-generated constraint stress is formed, local stress is overlarge, cracks are caused, the integrity of the structure is further destroyed, the service life of the cement-based material structure is reduced or even completely lost, and a great deal of manpower, material resources and financial resources are consumed for repairing, reinforcing and even reconstructing. Therefore, how to quickly and effectively evaluate and inhibit shrinkage cracking of cement-based materials is a problem to be solved by the engineering technology community.
The shrinkage characteristics of cement-based materials are closely related to their crack resistance. Therefore, how to correctly and effectively detect and evaluate the shrinkage and cracking performance of the cement-based material is a precondition that measures are taken to effectively inhibit or avoid cracking of the cement-based material component. In the current research on the shrinkage cracking test method of the cement-based material, a circular ring method, a flat plate method and a single-axis method are mainly adopted. However, the existing test method has the defects of longer test period, lower cracking sensitivity, random crack positions, difficulty in observation, inaccurate cracking time obtaining, high evaluation difficulty and the like.
Disclosure of Invention
The utility model aims to provide a device for rapidly evaluating the shrinkage restriction performance of a cement-based material, so as to solve the problems in the prior art, shorten the test period, improve the cracking sensitivity of the cement-based material, simultaneously, better control the cracking position of a crack, intuitively observe the crack condition of a test piece, and conveniently measure the width of the crack so as to reflect the shrinkage cracking performance of the cement-based material more truly.
In order to achieve the above object, the present utility model provides the following solutions:
the utility model provides a device for rapidly evaluating the shrinkage restraining performance of cement-based materials, which comprises: the inner ring is fixedly arranged on the bottom plate, the inner ring comprises an inner semicircular ring and a semicircular ring, two ends of the semicircular ring are respectively and integrally fixedly connected with two ends of the semicircular ring, and the outer ring is used for being placed on the bottom plate and is arranged in line with the axis of the inner semicircular ring.
Preferably, the outer ring comprises a first semicircular ring and a second semicircular ring, and the first semicircular ring and the second semicircular ring can be detachably and fixedly connected.
Preferably, the connecting device further comprises a plurality of connecting bolts, wherein first connecting plates are arranged at two ends of the first semicircular ring, first connecting holes are formed in the first connecting plates, second connecting plates are arranged at two ends of the second semicircular ring, second connecting holes are formed in the second connecting plates, and the connecting bolts are used for penetrating through the first connecting holes and the second connecting holes on the same side of the first semicircular ring and the second semicircular ring so as to fix the first semicircular ring and the second semicircular ring.
Preferably, the device further comprises a plurality of supports, and each support is fixedly arranged on the bottom surface of the bottom plate.
Preferably, the number of the supports is three, and the three supports are distributed in a regular triangle shape.
Preferably, the cross section of the bottom plate is square, the side length of the bottom plate is the same as the diameter of the outer circular ring, and the axial lead of the outer circular ring is collinear with the central line of the bottom plate.
Preferably, the device further comprises a lubricating layer, wherein the lubricating layer is coated on the inner side wall of the outer circular ring.
Compared with the prior art, the utility model has the following technical effects:
the utility model provides a device for rapidly evaluating the shrinkage restraining performance of a cement-based material, which is characterized in that an inner ring and an outer ring are arranged on a bottom plate, the inner ring is arranged into an inner semicircular ring and a semi-elliptical ring which are integrally connected, a cement-based material test piece is formed by pouring the cement-based material between the inner ring and the outer circular ring, and the stress on the cement-based material test piece at the semi-elliptical cross section is the largest, so that the test piece is induced to crack at the thinnest cross section during a test, the test period is greatly shortened, and the cracking sensitivity of the cement-based material is improved; the cement-based material test piece generated by the device for rapidly evaluating the constraint shrinkage performance of the cement-based material can limit the cracking position of the cement-based material test piece to the thinnest section of the semi-elliptical long shaft end, can more intuitively observe and record the number and the width of cracks and the like, and provides a basis for the follow-up analysis of the constraint shrinkage and cracking performance of the cement-based material.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a top view of an apparatus for rapid evaluation of cement-based material shrinkage-restricting properties provided by the present utility model;
FIG. 2 is a front view of the apparatus for rapidly evaluating shrinkage-restricting properties of cement-based materials provided by the present utility model;
in the figure: 1. an inner ring; 11. an inner semicircle ring; 12. a semi-elliptical ring; 2. an outer ring; 21. a first semi-circular ring; 22. a second semicircle ring; 23. a first connection plate; 24. a second connecting plate; 25. a connecting bolt; 3. a bottom plate; 4. and (5) a support.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The utility model aims to provide a device for rapidly evaluating the shrinkage restriction performance of a cement-based material, so as to solve the problems in the prior art, shorten the test period, improve the cracking sensitivity of the cement-based material, simultaneously, better control the cracking position of a crack, intuitively observe the crack condition of a test piece, and conveniently measure the width of the crack so as to reflect the shrinkage cracking performance of the cement-based material more truly.
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.
Example 1
The present embodiment provides a device for rapidly evaluating shrinkage restraint performance of cement-based materials, as shown in fig. 1 to 2, comprising: the bottom plate 3, the inner ring 1 and the outer ring 2, the inner ring 1 is fixedly arranged on the bottom plate 3, the inner ring 1 comprises an inner semicircular ring 11 and a semicircular ring 12, two ends of the semicircular ring are respectively and fixedly connected with two ends of the semicircular ring 12 in an integrated manner, the outer ring 2 is arranged on the bottom plate 3 and is arranged in a line with the axial lead of the inner semicircular ring 11, the inner semicircular ring 11 and the outer ring 2 are arranged on the bottom plate 3, the inner ring 1 is integrally connected with the semicircular ring 12, a cement-based material test piece is formed by pouring a cement-based material between the inner ring 1 and the outer ring 2, the stress on the cement-based material test piece at the semicircular section is the largest, so that the test piece is induced to crack at the thinnest section during a test, the test period is greatly shortened, and the crack sensitivity of the cement-based material is improved; the cement-based material test piece generated by the device for rapidly evaluating the constraint shrinkage performance of the cement-based material can limit the cracking position of the cement-based material test piece to the thinnest section of the semi-elliptical long shaft end, can more intuitively observe and record the number and the width of cracks and the like, and provides a basis for the follow-up analysis of the constraint shrinkage and cracking performance of the cement-based material.
In a preferred embodiment, the outer ring 2 comprises a first half ring 21 and a second half ring 22, the first half ring 21 and the second half ring 22 being detachably fixedly connected.
In a preferred embodiment, the device for rapidly evaluating the shrinkage performance of the cement-based material constraint further comprises a plurality of connecting bolts 25, wherein the first connecting plates 23 are arranged at two ends of the first semicircular ring 21, the first connecting plates 23 are provided with first connecting holes, the second connecting plates 24 are arranged at two ends of the second semicircular ring 22, the second connecting plates 24 are provided with second connecting holes, and the connecting bolts 25 are used for penetrating through the first connecting holes and the second connecting holes on the same sides of the first semicircular ring 21 and the second semicircular ring 22 to fix the first semicircular ring 21 and the second semicircular ring 22.
In a preferred embodiment, the device for rapidly evaluating the shrinkage restraining performance of the cement-based material further comprises a plurality of supports 4, wherein each support 4 is fixedly arranged on the bottom surface of the bottom plate 3, has a simple structure, can support the bottom plate 3, and is convenient for moving the device.
In a preferred embodiment, the number of the supports 4 is three, and the three supports 4 are distributed in a regular triangle shape, so that the support structure is simple and can be stably supported.
In a preferred embodiment, the cross section of the bottom plate 3 is square, the side length of the bottom plate 3 is the same as the diameter of the outer ring 2, and the axial line of the outer ring 2 is collinear with the central line of the bottom plate 3, so that the cement-based material test piece forms the thinnest cross section between the semi-elliptical ring 12 and the outer ring 2.
In a preferred embodiment, the device for rapidly evaluating the shrinkage restraining performance of the cement-based material further comprises a lubrication layer, wherein the lubrication layer is smeared on the inner side wall of the outer ring 2, so that the outer ring 2 is conveniently separated from the cement-based material test piece.
In a preferred embodiment, all the components are made of steel materials, the inner ring 1 is a whole body, the thickness is 12.5mm, the radius of the inner semicircular ring 11 is 140mm, the long axis of the semicircular ring 12 is 355mm, and the short axis is 280mm; the radius of the outer ring 2 is 227.5mm, the thickness is 2mm, the distance between the outer side of the semimajor axis vertex of the semi-elliptical ring 12 and the inner side of the outer ring 2 is 37.5mm, the height of the inner ring 1 is equal to the height of the outer ring 2 and 75mm, and the size of the concrete material testing device can be changed according to the requirement when the concrete material testing device is used for concrete material testing.
Example two
The test method based on the first embodiment comprises the following steps:
firstly, stirring a cement-based material to be tested, namely placing the cement-based material into a mortar stirrer for stirring uniformly, cleaning an assembly device, and coating lubricating oil on the inner surface of an outer ring 2, so that the outer ring 2 is convenient to disassemble a die and can be ensured to provide radial constraint for a test piece;
secondly, pouring the stirred cement-based material between an inner ring 1 and an outer ring 2 of the device, inserting and tamping the cement-based material by using a knife and the like, placing the cement-based material on a vibrating table for vibrating compaction, and coating a layer of plastic film on the surface to prevent water from rapidly evaporating;
and finally, placing the molded test piece in a standard curing chamber (the temperature is 20+/-2 ℃ and the relative humidity is more than 95%) for 24 hours, then removing a first semicircular ring 21 and a second semicircular ring 22 of an outer circular ring 2, placing the test piece in the chamber, uniformly smearing conductive paint on the semi-elliptical position of the test piece, connecting a wire connected with an industrial digital display automatic accumulation timer and a conductive paint coating into a passage by using an electric welding pen or an insulating tape after the conductive paint is dried (about 10 minutes), checking the connected device through a mobile phone once every 10 minutes, carrying out normal test if the time is consistent, and checking again if the error is more than 1 minute until the error is less than 1 minute. Observing whether the timer is stopped once every day, and recording and observing the conditions of the occurrence time of the crack, the offset distance of the crack and the like; and (3) repeating the steps as required to manufacture a plurality of test pieces to obtain a plurality of groups of test data.
Specific examples of the utility model:
the cement mortar used was blended with the cement mortar shown in Table 1, the cement ratio was 0.4, wherein water was ordinary tap water, cement was P.O42.5 ordinary Portland cement produced by Beijing Rixing Cement Co., ltd., sand was natural river sand, and the fineness modulus was 2.9.
Before the test, the inner surface of the device is cleaned and oiled. Cement mortar is placed in a mortar stirrer to be stirred uniformly, then the cement mortar is poured into the device, the standard curing room (the temperature is 20+/-2 ℃ and the relative humidity is greater than 95%) is cured for 24 hours, then the first semicircular ring 21 and the second semicircular ring 22 are removed, the conductive paint can be uniformly smeared on the semi-elliptical position of the test piece after the test piece is placed in the room, after the conductive paint is dried (about 10 minutes), a wire connected with an industrial digital display automatic accumulation timer and a conductive paint coating are connected into a passage by using an electric welding pen or an insulating adhesive tape, the connected device is checked by a mobile phone every 10 minutes, and if the error is smaller than 1 minute, the normal test can be performed. And (3) observing whether the timer is stopped once every day, recording and observing the conditions of the occurrence time of the crack, the offset distance of the crack and the like, repeating the steps to manufacture ten test pieces, and observing and recording ten groups of data.
The principles and embodiments of the present utility model have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present utility model; also, it is within the scope of the present utility model to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the utility model.
Claims (7)
1. The utility model provides a device of quick evaluation cement-based material constraint shrink performance which characterized in that: comprising the following steps:
the bottom plate is provided with a bottom plate,
the inner ring is fixedly arranged on the bottom plate, the inner ring comprises an inner semicircular ring and a semi-elliptical ring, two ends of the semicircular ring are respectively and fixedly connected with two ends of the semi-elliptical ring in an integral mode, and
the outer ring is used for being placed on the bottom plate and arranged in line with the axis of the inner semicircular ring.
2. The apparatus for rapid evaluation of shrinkage-constraining properties of cement-based materials of claim 1, wherein: the outer ring comprises a first semicircular ring and a second semicircular ring, and the first semicircular ring and the second semicircular ring can be detachably and fixedly connected.
3. The apparatus for rapid evaluation of shrinkage-restraining properties of cement-based materials according to claim 2, wherein: still include a plurality of connecting bolts, the both ends of first semicircle ring all are provided with first connecting plate, be provided with first connecting hole on the first connecting plate, the both ends of second semicircle ring all are provided with the second connecting plate, be provided with the second connecting hole on the second connecting plate, connecting bolt is used for passing first semicircle ring with second semicircle ring homonymy first connecting hole with the second connecting hole will first semicircle ring with the second semicircle ring is fixed.
4. The apparatus for rapid evaluation of shrinkage-constraining properties of cement-based materials of claim 1, wherein: the base plate is characterized by further comprising a plurality of supports, and each support is fixedly arranged on the bottom surface of the base plate.
5. The apparatus for rapid evaluation of shrinkage-constraining properties of cementitious materials as defined in claim 4, wherein: the number of the supports is three, and the three supports are distributed in a regular triangle shape.
6. The apparatus for rapid evaluation of shrinkage-constraining properties of cement-based materials of claim 1, wherein: the cross section of the bottom plate is square, the side length of the bottom plate is the same as the diameter of the outer ring, and the axial lead of the outer ring is collinear with the central line of the bottom plate.
7. The apparatus for rapid evaluation of shrinkage-constraining properties of cement-based materials of claim 1, wherein: the lubricating layer is smeared on the inner side wall of the outer ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321584056.7U CN220104611U (en) | 2023-06-21 | 2023-06-21 | Device for rapidly evaluating shrinkage restraining performance of cement-based material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321584056.7U CN220104611U (en) | 2023-06-21 | 2023-06-21 | Device for rapidly evaluating shrinkage restraining performance of cement-based material |
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| Publication Number | Publication Date |
|---|---|
| CN220104611U true CN220104611U (en) | 2023-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321584056.7U Active CN220104611U (en) | 2023-06-21 | 2023-06-21 | Device for rapidly evaluating shrinkage restraining performance of cement-based material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220104611U (en) |
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2023
- 2023-06-21 CN CN202321584056.7U patent/CN220104611U/en active Active
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