CN111855974A - Measuring device for self-shrinkage of cement mortar test piece - Google Patents
Measuring device for self-shrinkage of cement mortar test piece Download PDFInfo
- Publication number
- CN111855974A CN111855974A CN202010752002.1A CN202010752002A CN111855974A CN 111855974 A CN111855974 A CN 111855974A CN 202010752002 A CN202010752002 A CN 202010752002A CN 111855974 A CN111855974 A CN 111855974A
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- Prior art keywords
- cement mortar
- test piece
- mortar test
- self
- shrinkage
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- 239000011083 cement mortar Substances 0.000 title claims abstract description 49
- 238000012423 maintenance Methods 0.000 claims abstract description 11
- 239000000523 sample Substances 0.000 claims abstract description 10
- 239000004831 Hot glue Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 13
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 7
- 239000004568 cement Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a measuring device for self-contraction of a cement mortar test piece, which comprises a wave plate for placing the cement mortar test piece, wherein the wave plate is fixed on a maintenance frame and is limited in position in front of a positioning plate, and the positioning plate can fix the cement mortar test piece; vertical plates are fixedly connected to two ends of the maintenance frame in parallel respectively, two guide rails are fixedly connected between the two vertical plates in parallel, bearings are arranged on the two guide rails respectively, and the two bearings are fixedly connected into a whole through a bracket and can freely slide on the guide rails; and a digital display dial indicator is fixedly connected to the bracket, and a probe of the digital display dial indicator is in surface contact with a plug at one end of the cement mortar test piece so as to measure the length change of the cement mortar test piece in the uniaxial direction. The invention can start measurement when the cement mortar test piece is not coagulated, is beneficial to measuring the initial value of self-shrinkage, and can avoid the influence of the change of the position and the measurement point of the test piece on the measurement value of the self-shrinkage.
Description
Technical Field
The invention relates to the field of measurement of self-shrinkage of cement mortar test pieces, in particular to a device for measuring length change of a cement mortar test piece in a uniaxial direction.
Background
In civil engineering, cement is the most widely used material, and its good working performance is always relied on. However, due to the effects of chemical shrinkage and self-drying, cement-based materials are prone to shrinkage cracking, and especially when some industrial waste materials such as blast furnace slag, fly ash or materials such as metakaolin and silica fume are used for replacing ordinary portland cement, the cement-based materials are subjected to large shrinkage, severe cracking is generated, and the safety of building structures is threatened.
The application potential of mineral admixture or novel material in concrete is researched, and self-shrinkage is an important index for evaluating the working performance of the mineral admixture or novel material. In a laboratory, fresh mixture is usually filled into corrugated pipes, compacted by vibration, sealed at both ends by plugs, and placed on a corrugated plate to allow the corrugated plate to contract without restriction. After coagulation, the change in length was measured using a dial gauge at regular intervals. CN106932559A discloses a test method for evaluating shrinkage performance of cement paste, but the early shrinkage value is not easy to measure, the test piece is easy to break and deform by early measurement, and the initial value is influenced by late measurement to generate errors. In order to solve the problems, CN210198306U discloses a non-contact corrugated pipe self-contraction measuring mold, but only one cement mortar test piece can be measured simultaneously, which limits the application range.
Disclosure of Invention
The invention aims to provide an accurate, convenient and massively applicable self-contraction device which is used for more accurately measuring an initial value of a self-contraction '0' moment and a contraction value of each measurement time interval.
The invention adopts the following technical scheme for realizing the purpose:
the utility model provides a measuring device that is used for cement mortar test piece self-contraction which characterized in that: the device comprises a wave plate for placing a cement mortar test piece, wherein the wave plate is fixed on a maintenance frame, and the position of the wave plate is limited in front of a positioning plate which can fix the cement mortar test piece;
vertical plates are fixedly connected to two ends of the maintenance frame in parallel respectively, two guide rails are fixedly connected between the two vertical plates in parallel, bearings are arranged on the two guide rails respectively, the two bearings are fixedly connected into a whole through a bracket, and the two bearings can freely slide on the guide rails; and a digital display dial indicator is fixedly connected to the bracket, and is moved to enable the probe to be in surface contact with the plug surface at one end of the cement mortar test piece so as to measure the length change of the cement mortar test piece in the uniaxial direction.
Preferably, the self-shrinkage measuring device for the cement mortar test piece is characterized in that a plurality of positioning holes are formed in the maintenance frame, and correspond to the cement mortar test piece in position.
Preferably, a positioning needle is arranged below the bracket, and the movement direction of the positioning needle is limited to move up and down through a spring; the positioning needle has a downward movement tendency through a spring.
Preferably, the wave plate is fixedly connected with a guide plate, one end of the guide plate is arranged at the front end of the cement mortar test piece on one side, the other end of the guide plate is arranged on the side edge of the cement mortar test piece on the other side, and the reading of the digital display dial indicator probe can be reset to zero when the digital display dial indicator probe moves to the current position.
Preferably, the positioning plate fixes the cement mortar test piece through hot melt adhesive or oily plasticine.
Preferably, the self-contraction measuring device for the cement mortar test piece is provided by the invention, and the positioning plate is fixedly connected with the correcting rod.
Has the advantages that:
compared with the prior art, the invention has the beneficial effects that:
the freshly mixed cement mortar test piece can be placed into a device to start measurement after being prepared, cracking and even breaking caused by moving the test piece and the like are avoided, and the test piece is prevented from being damaged due to human factors; meanwhile, the measurement can be started when the test piece is not coagulated, so that the self-contraction '0' moment can be accurately grasped; one end of the cement mortar test piece is fixed on the curing frame and is arranged on the wave plate, the test piece is relatively stable, and the influence of self-contraction caused by the change of the position of the test piece and the measuring point in the later period can be avoided; finally, the invention can manufacture different numbers of measuring positions according to the requirements, and has wider applicability.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a positioning diagram of the dial gauge of the present invention during measurement;
FIG. 4 is a cross-sectional view of the dial gauge of the present invention in its measured position;
FIG. 5 is a fixing view of the cement mortar test piece of the present invention.
Detailed Description
The present invention or the present invention will be further explained below with reference to specific examples.
A measuring device for the self-contraction of a cement mortar test piece comprises a wave plate for placing the cement mortar test piece, wherein the wave plate is fixed on a maintenance frame, and the position of the wave plate is limited in front of a positioning plate which can fix the cement mortar test piece; vertical plates are fixedly connected to two ends of the maintenance frame in parallel respectively, two guide rails are fixedly connected between the two vertical plates in parallel, bearings are arranged on the two guide rails respectively, and the two bearings are fixedly connected into a whole through a bracket and can freely slide on the guide rails; a digital display dial indicator is fixedly connected to the bracket, and a probe of the digital display dial indicator is in contact with the surface of a plug at one end of the cement mortar test piece so as to measure the length change of the cement mortar test piece in the uniaxial direction; a plurality of positioning holes are arranged on the maintenance frame, and correspond to the cement mortar test piece in position; a positioning needle is arranged below the bracket, and the movement direction of the positioning needle is limited to move up and down through a spring; the positioning needle has a downward movement trend through a spring; the wave plate is fixedly connected with a guide plate, one end of the guide plate is arranged at the front end of the cement mortar test piece on one side, the other end of the guide plate is arranged on the side edge of the cement mortar test piece on the other side, and the reading of the digital display dial indicator can be reset to zero; the positioning plate fixes the cement mortar test piece through hot melt adhesive or oily plasticine; and a correcting rod is fixedly connected to the positioning plate.
When the device is used, newly-mixed cement mortar is filled into the corrugated pipe, the corrugated pipe is vibrated to be compact, then two ends of the corrugated pipe are sealed, the corrugated pipe is placed on the corrugated pipe, the front end of the corrugated pipe is aligned with the guide plate on one side, the probe of the digital display dial indicator can smoothly slide to the surface of the plug, meanwhile, a gap between the other end of the test piece and the positioning plate is filled with hot melt adhesive or oily plasticine, and the test piece and the positioning plate are fixed to prevent the later position from being dislocated to influence the measurement result; measuring time can be selected according to the setting time of the mortar, and the initial value of the time of 0 is selected after the shrinkage value of the test piece before and after setting is measured; when the positioning pin is fixed on the positioning hole, the shrinkage value of the test piece at the corresponding position is measured and recorded, and the rest can be done. After single measurement, the digital display dial indicator probe is fully unfolded, so that the influence on the measurement precision due to external factors can be avoided.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. The utility model provides a measuring device that is used for cement mortar test piece self-contraction which characterized in that: the corrugated plate 3 is used for placing a cement mortar test piece 1, the corrugated plate 3 is fixed on a maintenance frame 11, the position is limited in front of a positioning plate 4, and the positioning plate 4 can fix the cement mortar test piece 1;
vertical plates 10 are fixedly connected to two ends of the maintenance frame 11 in parallel respectively, two guide rails 9 are fixedly connected between the two vertical plates 10 in parallel, bearings 8 are arranged on the two guide rails 9 respectively, the two bearings 8 are fixedly connected into a whole through a bracket 7, and the whole can freely slide on the guide rails 9; and fixedly connecting a digital display dial indicator 6 on the bracket 7, and moving the digital display dial indicator 6 to enable the probe to be in surface contact with a plug 15 at one end of the cement mortar test piece 1 so as to measure the length change of the cement mortar test piece 1 in the uniaxial direction.
2. The measuring device for the self-shrinkage of cement mortar test pieces as claimed in claim 1, characterized in that: the maintenance frame 11 is provided with a plurality of positioning holes 12, and the positioning holes 12 correspond to the cement mortar test piece 1 in position.
3. A measuring device for the self-shrinkage of cement mortar test pieces according to claims 1-2, characterized in that: a positioning needle 14 is arranged below the bracket 7, and the movement direction of the positioning needle 14 is limited to move up and down through a spring 13; the positioning pin 14 is given a tendency to move downwards by means of a spring 13.
4. The measuring device for the self-shrinkage of cement mortar test pieces as claimed in claim 1, characterized in that: the wave plate 3 is fixedly connected with a guide plate 5, one end of the guide plate 5 is arranged at the front end of the cement mortar test piece 1 on one side, the other end of the guide plate is arranged at the side edge of the cement mortar test piece 1 on the other side, and the reading of the probe of the digital display dial indicator 6 can be reset to zero when the probe moves to the current position.
5. The measuring device for the self-shrinkage of cement mortar test pieces as claimed in claim 1, characterized in that: the positioning plate 4 fixes the cement mortar test piece 1 through hot melt adhesive or oily plasticine.
6. The measuring device for the self-shrinkage of cement mortar test pieces as claimed in claim 1, characterized in that: the positioning plate 4 is fixedly connected with a correcting rod 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010752002.1A CN111855974A (en) | 2020-07-30 | 2020-07-30 | Measuring device for self-shrinkage of cement mortar test piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010752002.1A CN111855974A (en) | 2020-07-30 | 2020-07-30 | Measuring device for self-shrinkage of cement mortar test piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111855974A true CN111855974A (en) | 2020-10-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010752002.1A Pending CN111855974A (en) | 2020-07-30 | 2020-07-30 | Measuring device for self-shrinkage of cement mortar test piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111855974A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112743669A (en) * | 2020-12-21 | 2021-05-04 | 中国建筑科学研究院有限公司 | Fluidity concrete test piece forming test frame and test method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2625893Y (en) * | 2003-05-27 | 2004-07-14 | 南京工业大学 | Measuring device for early shrinkage ratio of cement concrete material |
| CN201569653U (en) * | 2009-12-16 | 2010-09-01 | 上海市建筑科学研究院(集团)有限公司 | Device for measuring self-contractibility rate of cement-based materials |
| RU2558852C1 (en) * | 2014-07-29 | 2015-08-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный аграрный университет" | Device measuring characteristics of samples of concrete prepared based on expanded cement |
| CN209570596U (en) * | 2018-11-14 | 2019-11-01 | 华润水泥技术研发有限公司 | Cement-based material morning age self-constriction and the dry dual-purpose tester of contraction |
| RU194372U1 (en) * | 2019-04-29 | 2019-12-09 | Акционерное Общество Триада-Холдинг | Performance bench for quick setting cement |
-
2020
- 2020-07-30 CN CN202010752002.1A patent/CN111855974A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2625893Y (en) * | 2003-05-27 | 2004-07-14 | 南京工业大学 | Measuring device for early shrinkage ratio of cement concrete material |
| CN201569653U (en) * | 2009-12-16 | 2010-09-01 | 上海市建筑科学研究院(集团)有限公司 | Device for measuring self-contractibility rate of cement-based materials |
| RU2558852C1 (en) * | 2014-07-29 | 2015-08-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный аграрный университет" | Device measuring characteristics of samples of concrete prepared based on expanded cement |
| CN209570596U (en) * | 2018-11-14 | 2019-11-01 | 华润水泥技术研发有限公司 | Cement-based material morning age self-constriction and the dry dual-purpose tester of contraction |
| RU194372U1 (en) * | 2019-04-29 | 2019-12-09 | Акционерное Общество Триада-Холдинг | Performance bench for quick setting cement |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112743669A (en) * | 2020-12-21 | 2021-05-04 | 中国建筑科学研究院有限公司 | Fluidity concrete test piece forming test frame and test method |
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Application publication date: 20201030 |