CN109856376A - A kind of device for testing Shrinkage Characteristics of Cement-based Materials - Google Patents
A kind of device for testing Shrinkage Characteristics of Cement-based Materials Download PDFInfo
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- CN109856376A CN109856376A CN201910047648.7A CN201910047648A CN109856376A CN 109856376 A CN109856376 A CN 109856376A CN 201910047648 A CN201910047648 A CN 201910047648A CN 109856376 A CN109856376 A CN 109856376A
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- cement
- based materials
- shrinkage characteristics
- reflector
- laser
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Abstract
The present invention relates to a kind of devices for testing Shrinkage Characteristics of Cement-based Materials, which includes signal acquiring board with a scale, reflector, suspension arrangement and the laser emitter being installed on the signal acquiring board.The front of the laser emitter is equipped with the reflector；The end of the suspension arrangement is equipped with test specimen, and the end surface of the test specimen is equipped with the reflector in parallel.Test process of the present invention is convenient and efficient, the volume change of cement-based material itself can not only be tested, the volume change under other conditions coupling condition can also be tested, to solve volume change situation of the test cement-based material under other coupling conditions at present, and can largely test test specimen.
Description
Technical field
The present invention relates to the field of test technology of cement-based material more particularly to a kind of test Shrinkage Characteristics of Cement-based Materials
Device.
Background technique
Cement-based material can become as the main cementing material of cement concrete, its own volume in hydration process
Change, more complicated change procedure can occur in extraneous environment coupled action lower volume, cement-based material cracking is by table mostly
Face cracks and deepens continuously, therefore research cement-based material surface volume stability becomes particularly important.It is surveyed using standard drying shrinkage
Method for testing can only test later period contraction and experimental error is larger；It is higher using contactless contraction test method accuracy, but
Instrument channel is occupied in test process, is unfavorable for high-volume and long-term test experiments research；Ripple tube method can only test material from
The contraction of body, the contraction being unable to get under external environment coupling condition.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of accurate, intuitive test Shrinkage Characteristics of Cement-based Materials
Device.
To solve the above problems, a kind of device for testing Shrinkage Characteristics of Cement-based Materials of the present invention, feature exist
In: the device includes signal acquiring board with a scale, reflector, suspension arrangement and is installed on swashing on the signal acquiring board
Optical transmitting set；The front of the laser emitter is equipped with the reflector；The end of the suspension arrangement is equipped with test specimen, the test specimen
End surface be equipped with the reflector in parallel.
The signal acquiring board is semi-transparent nature of glass plate, and its scale for being equipped with interval 1mm from bottom to top, total length are
2000mm。
The signal acquiring board installs the laser emitter at osculum away from an osculum is opened at the 500mm of bottom edge.
The laser radiation device be single-point laser transmitter, LASER SPECKLE diameter be 0.5mm, and with the suspension arrangement
Vertically.
The spacing of the laser emitter and the reflector is 1m.
The parallel distance of the suspension arrangement and the signal acquiring board is 1000mm.
The reflector is high reflectance plate two-way mirror, and reflectivity is 90% or more and does not cause the scattering of laser,
Global density is less than 1.5kg/m3。
The a length of 1000mm of the test specimen, width 50mm, a height of 10mm, the porous steel disc of sole arrangement, steel plate thickness are
0.5mm。
The two-end-point of the test specimen is on same vertical line.
Compared with the prior art, the present invention has the following advantages:
1, the present invention reflects amplification principle using light, will appear bending, laser warp after testing the unilateral confined shrinkage of cement-based material
Meeting reflection migrating after reflector acquires offset using collection plate, is computed the shrinkage that can obtain cement-based material.
2, the present invention can intuitively observe test specimen contraction situation, can also accurately measure the shrinkage of cement-based material, can be accurate
To ten a ten thousandths, to solve the problems, such as that current cement-based material can not be in the contraction under coupling condition.
3, the laser emitter LASER SPECKLE diameter in the present invention is 0.5mm, has high light gathering degree, and test essence can be improved
Degree.
4, cement-based material contraction is tested using the present invention, after can intuitively observing cement-based material contraction
Bending situation, avoid practical contraction situation and test result contradiction.
5, test process of the present invention is convenient and efficient, can not only test the volume change of cement-based material itself, can be with
The volume change under other conditions coupling condition is tested, tests cement-based material at present in other coupling conditions to solve
Under volume change situation, and can largely test test specimen.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 is the structural diagram of the present invention.
In figure: 1-laser emitter；2-reflectors；3-test specimens；4-suspension arrangements；5-signal acquiring boards.
Specific embodiment
As shown in Figure 1, a kind of device for testing Shrinkage Characteristics of Cement-based Materials, which includes signal acquisition with a scale
Plate 5, reflector 2, suspension arrangement 4 and the laser emitter 1 being installed on signal acquiring board 5.The front of laser emitter 1 is set
There is reflector 2；The end of suspension arrangement 4 is equipped with test specimen 3, and the end surface of the test specimen 3 is equipped with reflector 2 in parallel.
Wherein: signal acquiring board 5 is semi-transparent nature of glass plate, and its scale for being equipped with interval 1mm from bottom to top, total length
For 2000mm.
Signal acquiring board 5 installs laser emitter 1 at osculum away from an osculum is opened at the 500mm of bottom edge.
Laser radiation device 1 is single-point laser transmitter, and LASER SPECKLE diameter is 0.5mm, and vertical with suspension arrangement 4.
The spacing of laser emitter 1 and reflector 2 is 1m.
The parallel distance of suspension arrangement 4 and signal acquiring board 5 is 1000mm.
Reflector 2 is high reflectance plate two-way mirror, and reflectivity is 90% or more and does not cause the scattering of laser, whole
Volume density is less than 1.5kg/m3。
The a length of 1000mm of test specimen 3, width 50mm, a height of 10mm, the porous steel disc of sole arrangement, steel plate thickness 0.5mm.
The two-end-point of test specimen 3 is on same vertical line.
Aperture steel disc is placed in 3 bottom surface of test specimen when shaping test piece 3, joints cement sill is put in 3 end surface of test specimen
Reflector 2 is set, guarantees that 2 surface of reflector is parallel with 3 surface of test specimen.
Signal acquiring board 5 installs laser emitter 1, laser and suspension arrangement at osculum away from an osculum is opened at the 500mm of bottom edge
4 is vertical, and signal acquiring board 5 and 4 parallel distance of suspension arrangement are 1000mm；Suspension arrangement 4 guarantees on test specimen 3 after hanging test specimen 3
Endpoint is 500mm at a distance from 5 upper extreme point of signal acquiring board.
In use, test specimen 3 is suspended on suspension arrangement 4, and keep test specimen 3 static, laser emitter 1 emits laser beam,
It is radiated on the reflector 2 of test specimen 3, on 2 reflection laser beam to signal acquiring board 5 of reflector, records data AC segment length L；Number
According to primary data need to be recorded, final data is recorded after the test, and data difference is test specimen shrinkage value.
It is computed gained:
α=arctanL/1000
F=α
FC=F0-FZ
In formula: α is arc chord angle, i.e. α=α1=α2, unit is radian number；L is AC segment length, unit mm；F is test volume, unit
For %；FCFor shrinking percentage, unit %；F0For initial testing value, unit %；FZFor final test value, unit %.
Shrinking percentage and L relationship are as shown in table 1:
1 shrinking percentage of table and the list of L corresponding data
Claims (9)
1. a kind of device for testing Shrinkage Characteristics of Cement-based Materials, it is characterised in that: the device includes signal acquisition with a scale
Plate (5), reflector (2), suspension arrangement (4) and the laser emitter (1) being installed on the signal acquiring board (5)；It is described
The front of laser emitter (1) is equipped with the reflector (2)；The end of the suspension arrangement (4) is equipped with test specimen (3), the test specimen
(3) end surface is equipped with the reflector (2) in parallel.
2. a kind of device for testing Shrinkage Characteristics of Cement-based Materials as described in claim 1, it is characterised in that: the signal is adopted
Collecting plate (5) is semi-transparent nature of glass plate, and its scale for being equipped with interval 1mm from bottom to top, total length 2000mm.
3. a kind of device for testing Shrinkage Characteristics of Cement-based Materials as described in claim 1, it is characterised in that: the signal is adopted
Collection plate (5) installs the laser emitter (1) at osculum away from an osculum is opened at the 500mm of bottom edge.
4. a kind of device for testing Shrinkage Characteristics of Cement-based Materials as described in claim 1, it is characterised in that: the laser is put
Emitter (1) is single-point laser transmitter, and LASER SPECKLE diameter is 0.5mm, and vertical with the suspension arrangement (4).
5. a kind of device for testing Shrinkage Characteristics of Cement-based Materials as described in claim 1, it is characterised in that: the laser hair
Emitter (1) and the spacing of the reflector (2) are 1m.
6. a kind of device for testing Shrinkage Characteristics of Cement-based Materials as described in claim 1, it is characterised in that: the suspension dress
The parallel distance for setting (4) and the signal acquiring board (5) is 1000mm.
7. a kind of device for testing Shrinkage Characteristics of Cement-based Materials as described in claim 1, it is characterised in that: the reflector
It (2) is high reflectance plate two-way mirror, reflectivity is 90% or more and does not cause the scattering of laser, and global density is less than
1.5kg/m3。
8. a kind of device for testing Shrinkage Characteristics of Cement-based Materials as described in claim 1, it is characterised in that: the test specimen
(3) a length of 1000mm, width 50mm, a height of 10mm, the porous steel disc of sole arrangement, steel plate thickness 0.5mm.
9. a kind of device for testing Shrinkage Characteristics of Cement-based Materials as described in claim 1, it is characterised in that: the test specimen
(3) two-end-point is on same vertical line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910047648.7A CN109856376B (en) | 2019-01-18 | 2019-01-18 | Device for testing shrinkage performance of cement-based material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910047648.7A CN109856376B (en) | 2019-01-18 | 2019-01-18 | Device for testing shrinkage performance of cement-based material |
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| CN109856376A true CN109856376A (en) | 2019-06-07 |
| CN109856376B CN109856376B (en) | 2021-12-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113138126A (en) * | 2021-04-25 | 2021-07-20 | 青岛中青建安建工集团有限公司 | Performance inspection device for concrete prefabricated part |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0049090A1 (en) * | 1980-10-01 | 1982-04-07 | Burks, A. Edward and Green, J. Keith | Testing mechanism for floors |
| CN203178143U (en) * | 2013-03-28 | 2013-09-04 | 北京理工大学 | Automatic bending rigidity test device |
| CN204389310U (en) * | 2015-02-12 | 2015-06-10 | 郝文琪 | Tinsel measure apparatus of youngs modulus |
| CN206378429U (en) * | 2016-12-25 | 2017-08-04 | 北京敬业达新型建筑材料有限公司 | A kind of device for testing cement paste or Mortar shrinkage |
| CN107328922A (en) * | 2017-08-28 | 2017-11-07 | 哈尔滨工业大学 | The test device that foam concrete volume is deformed under the conditions of a kind of steam curing |
| CN107884778A (en) * | 2017-12-06 | 2018-04-06 | 济南兰光机电技术有限公司 | A kind of device, method and film pyrocondensation tester for detecting material expansion and contraction |
| CN108267470A (en) * | 2017-12-18 | 2018-07-10 | 江苏苏博特新材料股份有限公司 | The self-constriction test system and test method of cement-based material under a kind of temperature match curing conditions |
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| 张量 等: "非接触式测试方法对水泥基灌浆料竖向收缩性能的研究", 《2012第五届(中国)国际建筑干混砂浆生产应用技术研讨会论文集》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113138126A (en) * | 2021-04-25 | 2021-07-20 | 青岛中青建安建工集团有限公司 | Performance inspection device for concrete prefabricated part |
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Inventor after: Wei Dingbang Inventor after: Cao Qingxia Inventor after: Wang Xuejuan Inventor after: Lei Pengdou Inventor after: Chen Peng Inventor after: Ma Yuangong Inventor after: Ding Min Inventor after: Ren Guobin Inventor after: Wu Laidi Inventor after: Zhao Jingzhuo Inventor after: Yang Xiaosen Inventor after: Zhang Fukui Inventor after: Wei Qiang Inventor after: Zhang Junlin Inventor before: Ding Min Inventor before: Cao Qingxia Inventor before: Wang Xuejuan Inventor before: Lei Pengdou Inventor before: Chen Peng Inventor before: Ma Yuangong Inventor before: Ren Guobin Inventor before: Wu Laidi Inventor before: Wei Dingbang Inventor before: Zhao Jingzhuo Inventor before: Yang Xiaosen Inventor before: Zhang Fukui Inventor before: Wei Qiang Inventor before: Zhang Junlin |
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