CN208672633U - A kind of test device of Dry Shrinkage of Cement Mortar - Google Patents
A kind of test device of Dry Shrinkage of Cement Mortar Download PDFInfo
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- CN208672633U CN208672633U CN201821215886.1U CN201821215886U CN208672633U CN 208672633 U CN208672633 U CN 208672633U CN 201821215886 U CN201821215886 U CN 201821215886U CN 208672633 U CN208672633 U CN 208672633U
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- cement mortar
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- dry shrinkage
- tester
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Abstract
The utility model discloses a kind of test devices of Dry Shrinkage of Cement Mortar, including chunk and tester, lubricious material layer is arranged in the mold at least on the inner surface of roof, back wall and bottom wall, to reduce the frictional force that cement mortar sample is subject to during the test, the tester is mounted in mold, for detecting Dry Shrinkage of Cement Mortar.The test device structure is simple, the stress condition after capable of simulating the upper wall of cement mortar, can obtain drying shrinkage deformation and the drying shrinkage stress data of the cement mortar for more accurately meeting practical application.
Description
Technical field
The utility model relates to the test device of cement mortar performance more particularly to a kind of surveys of Dry Shrinkage of Cement Mortar
Trial assembly is set.
Background technique
Wall surface mortar hollowing is a big common fault of building trade, in fact, causing the essence of concrete surface mortar hollowing
The reason is that concrete and mortar all have certain shrinkage stress after solidifying, certain shrinking percentage can be each generated, due to two
The shrinkage stress that person generates is different, and the shrinking percentage of generation is inconsistent, the shrinking percentage of normal concrete about 300 × 10-6, and normal sands
The shrinking percentage of slurry about 1000 × 10-6, the two shrinking percentage difference about 700 × 10-6.When the shrinkage stress of generation is more than mortar institute energy
When the maximum shear stress of receiving, screed and base can be made to remove, to generate hollowing phenomenon.So in practical applications, water
The dry-shrinkage deformed and drying shrinkage stress test meaning of cement mortar is extremely important.
Currently, in standard GB/T/T 25181-2010 " premixing mortar " shrinking percentage index test method JGJ/T 70-
The clause 12 of 2009 " building mortar basic performance tests methods ", specimen size 40mm × 40mm × 160mm prism, and
Two end face centers of die trial, are put into defined feeder head, are subsequently placed in vertical mortar retractometer and are tested.The method due to
Specimen length is short and the test theory of sample free shrink deviates with practical, is on the one hand that specimen length is short without enough deformation
It generates, leads to not measure result；On the other hand the data of test are the shrinking percentage under sample free shrink, in practical applications
It was found that although the requirement that meet national standards of sample testing result, always wall surface mortar such as occurs cracking the feelings in the application
Condition, it is seen that actual conditions cannot always be reacted by testing resulting result data, it is impossible to be used in instruct practical application.In addition, current
There is no test device, method and the requirement of drying shrinkage stress after the upper wall for cement mortar in national sector standard.
Utility model content
The purpose of the utility model is to provide a kind of test devices of Dry Shrinkage of Cement Mortar.The test device structure
Simply, the stress condition after capable of simulating the upper wall of cement mortar, can obtain the cement for more accurately meeting practical application
The drying shrinkage deformation of mortar and drying shrinkage stress data.
The purpose of this utility model is achieved through the following technical solutions: a kind of test dress of Dry Shrinkage of Cement Mortar
It sets, including chunk and tester, at least lubricious material is arranged on the inner surface of roof, back wall and bottom wall in the mold
Layer, to reduce the frictional force that cement mortar sample is subject to during the test, the tester is mounted in mold, for detecting
Dry Shrinkage of Cement Mortar.
The result that existing shrinking percentage test method is measured only has reacted the drying shrinkage under cement mortar free state
Can, influence of the external constraint to cement mortar performance is had ignored, performance of the cement mortar in practical application can not be reacted.
Its surrounding is connected with both walls, ceiling and floor respectively after wall in cement mortar, in the state of external constraint because
Contraction causes tensile stress (drying shrinkage stress), therefore in practical application, there is only do because what interior constraint generated for cement mortar
Stress under compression, there is also drying shrinkage stress caused by external constraint.In order to detect shrinkage performance of the cement mortar under application, this
Prepared cement mortar, can be put into mould cavity and sample is made by the chunk of utility model setting, gained sample
Top surface, back, bottom surface and wherein by mold roof, rear wall and bottom wall and wherein one side wall is limited one end, and the other end
Portion be free extension end, it is unrestricted can free shrink.Sample is placed in standard environment together with mold and is tested.
Since the roof of die cavity, back wall and bottom wall and one side wall generate constraint to cement mortar sample, the contraction of sample, mould are limited
The effect that the ceiling in application, metope, floor and a face side wall generate cement mortar, resulting test result are intended
Closer to practical shrinkage performance when cement mortar application, directive significance is had more to actual engineer application.
The utility model further include detection location structure, including the fixed plate for being inlaid in cement mortar sample one end with
And it is perpendicularly fixed at the locating rod of fixed plate central point, fixed plate is inlaid in cement mortar examination when making cement mortar sample
On one end end face of sample and locating rod central axes are overlapped with sample central axes, and the end of the locating rod free end is test point,
The induction end of the tester and the detection point contact of locating rod obtain cement mortar sample shrinkage performance data in real time.
Further, the detection location structure further includes anchor structure, so that it is securely fixed in cement mortar examination
In sample.As one embodiment of the utility model, the anchor structure includes the fixing end by locating rod along locating rod
Axis extends through the extension of fixed plate formation, which is equipped with anchoring sheet.
The fixed plate length and width size of the detection location structure is slightly smaller than the width and depth of mould cavity, in this way
So that fixed plate is inlaid in behind cement mortar sample end face three peripheries therein respectively between mold roof, rear wall and bottom wall
With gap, avoids it from contacting with mold and generate friction effects test result.
The space of the length direction of the mould cavity can accommodate the cement mortar sample that length is at least 1000mm, and
There are enough spaces to place tester and detection location structure.Sufficiently long die cavity, which is arranged, can be used for preparing longer sample,
There are enough contracted lengths, keep test result more accurate and reliable.
The width of the die cavity of the mold is not less than 100mm, and depth is not less than 5mm.The mold is rectangular parallelepiped structure,
Die cavity is rectangle.
The lubricious material layer is nylon material layer.
The tester includes inductor, and the inductor is detachably accepted on one end side wall of mold
's.As one of embodiment, inductor can be detachable by the position adjustment structure being arranged on one end side wall of mold
It is installed on mold.The position adjustment structure can be designed according to the structure of inductor and the convenience row of operation.For example, adopting
Inductor has standing screw, and as one embodiment of the utility model, the position adjustment structure then includes setting
In the standing screw of the opening sliding slot being arranged along cavity depth direction, inductor on mould side wall and setting in standing screw
On two nuts, the sliding slot central axes are overlapped with central axes of the side wall on cavity depth direction, and the trough width is slightly
Greater than inductor standing screw diameter, the nut outer profile size is greater than sliding slot, when installing inductor, need to only adjust two spiral shells
Spacing between mother is greater than mould side wall thickness, that section of screw rod between two nuts is inserted in sliding slot from opening, then screws two
Nut clamps mould side wall, thus stationary induction apparatus.
The tester is detector for displacement measuring or measuring stress instrument.When tester is detector for displacement measuring, for surveying
Try the drying shrinkage deformation of cement mortar sample；When tester is measuring stress instrument, the drying shrinkage for testing cement mortar sample is answered
Power.
The detector for displacement measuring is precise electronic detector for displacement measuring.
The measuring stress instrument includes strain gauge and the stress meter that connect with strain gauge.
The utility model has the following beneficial effects:
1. the utility model is arranged the mold of a rectangular die cavity of tool, roof, rear wall, bottom wall and wherein one side wall can
To generate constraint to cement mortar sample, the contraction of sample is limited, ceiling, metope, floor in application are simulated
The effect generated with a face side wall to cement mortar, resulting test result are more able to reflect drying shrinkage when cement mortar application
Energy.
2. the utility model can replace tester according to the target component of test, two kinds of purposes of a device meet practical
Requirement of engineering is capable of the data of drying shrinkage deformation and the drying shrinkage application of lateral collection cement mortar.
3. the utility model can prepare the sample that length is at least 1000mm, there are enough contracted lengths, make to survey
Test result is more accurate and reliable.
4. the utility model is arranged lubricious material layer at least on the roof of mold, rear wall and bottom wall inner surface, reduce at
The frictional force that type sample is subject to, so that test result is more accurate.
Detailed description of the invention
Fig. 1 is the schematic structural diagram of testing device of embodiment one.
Fig. 2 is the enlarged diagram in the portion A of Fig. 1.
Fig. 3 is the test device mold left side wall schematic diagram of embodiment one.
Fig. 4 is the schematic structural diagram of testing device of embodiment two.
Specific embodiment
Embodiment one
A kind of cement mortar shown in Fig. 1-3 shrinks one embodiment that deformation testing device is the utility model, including
Mold 1, tester and detection location structure.Tester includes sensor, and sensor is the precise electronic position with standing screw
Shift measurement instrument 7.Mold 1 is rectangular parallelepiped structure, has a rectangle die cavity, the roof of mold, back wall, bottom wall and right side wall interior table
Nylon material layer is set on face, to reduce the frictional force that cement mortar sample 2 is subject to during the test.
Precise electronic detector for displacement measuring 7 is fixed in mold left wall by position adjustment structure 6.The position adjustment structure 6
It is included on mold left side wall along the opening sliding slot 61 of cavity depth direction setting, the fixation spiral shell of precise electronic detector for displacement measuring 7
Bar 71 and two adjusting nuts 62 being arranged on standing screw 71,61 central axes of sliding slot and left side wall are along cavity depth direction
On central axes be overlapped, 61 width of sliding slot can be equal to or slightly larger than 71 diameter of standing screw, two 62 outer profile rulers of adjusting nut
It is very little to be greater than sliding slot 61.When installing inductor 7, adjusting two 62 positions of adjusting nut makes spacing between the two be greater than left side
Wall thickness, that section of screw rod is inserted in sliding slot 61 from opening between two adjusting nuts 62, screws two 62 clamping dies of adjusting nut
Has left side wall, thus fixed precise electronic detector for displacement measuring 7.
Detecting location structure includes fixed plate 3, the locating rod 31 and anchor structure for being perpendicularly fixed at fixed plate central point.Gu
3 length and width size of fixed board is slightly smaller than the width and depth of mould cavity, so that fixed plate 3 is inlaid in cement mortar examination
Three peripheries therein have gap between mold roof, back wall and bottom wall respectively behind 2 end face of sample, it is avoided to contact with mold
Generate friction effects test result.Anchor structure is extended through by the fixing end of locating rod 31 along 31 central axes of locating rod solid
The anchoring sheet 33 for 32 free end of extension 32 and extension that fixed board 3 is formed is constituted.It will consolidate when making cement mortar sample 2
Fixed board 3 is inlaid on the end face at 2 free shrink end of cement mortar sample, and the end of 31 free end of locating rod is monitoring point, accurate
The induction end of electron displacement measuring instrument 7 and the detection point contact of locating rod 31, obtain 2 shrinkage performance number of cement mortar sample in real time
According to.
The mold cavity width of mold 1 is 100mm, and depth 5mm, the space of length direction can accommodate length and be at least
The cement mortar sample 2 of 1000mm, and there are enough spaces to place precise electronic detector for displacement measuring 7 and detection location structure.If
Setting sufficiently long die cavity can be used for preparing longer sample, to there is enough contracted lengths, keep test result more accurate
Reliably.
Embodiment two
Be not both with embodiment one: tester be include the strain gauge 4 and and stress sensing with standing screw
The stress meter 5 that device 4 connects.
The utility model can be summarized with others without prejudice to the concrete form of the spirit or essential characteristics of the utility model.
The embodiment above of the utility model can only all be considered to illustrate and not limit the utility model, therefore all foundations
The substantial technological of the utility model any subtle modifications, equivalent variations and modifications to the above embodiments, belong to this reality
In the range of new technique scheme.
Claims (10)
1. a kind of test device of Dry Shrinkage of Cement Mortar, characterized in that including chunk and tester, the mold is extremely
Few that lubricious material layer is arranged on the inner surface of roof, back wall and bottom wall, the tester is mounted in mold, for detecting water
Cement mortar shrinkage performance.
2. the test device of Dry Shrinkage of Cement Mortar according to claim 1, characterized in that further include detection positioning knot
Structure comprising for being inlaid in the fixed plate of cement mortar sample one end and being perpendicularly fixed at the positioning of fixed plate central point
Bar, the end of the locating rod free end are test point, the induction end of the tester and the detection point contact of locating rod, in real time
Obtain cement mortar sample shrinkage performance data.
3. the test device of Dry Shrinkage of Cement Mortar according to claim 2, characterized in that the detection location structure
It further include anchor structure, the anchor structure includes extending through fixed plate shape along locating rod central axes by the fixing end of locating rod
At extension, the extension free end be equipped with anchoring sheet.
4. the test device of Dry Shrinkage of Cement Mortar according to claim 2 or 3, characterized in that the detection positioning
The fixed plate length and width size of structure is slightly smaller than the width and depth of mould cavity, so that fixed plate is inlaid in cement mortar
Three peripheries therein have gap between mold roof, rear wall and bottom wall respectively behind sample end face.
5. the test device of Dry Shrinkage of Cement Mortar according to claim 1, characterized in that the die cavity of the mold
The space of length direction can accommodate the cement mortar sample that length is at least 1000mm, and have enough spaces place tester with
Detect location structure.
6. the test device of Dry Shrinkage of Cement Mortar according to claim 5, characterized in that the die cavity of the mold
Width is not less than 100mm, and depth is not less than 5mm.
7. the test device of Dry Shrinkage of Cement Mortar according to claim 1, characterized in that the lubricious material layer
For nylon material layer.
8. the test device of Dry Shrinkage of Cement Mortar according to claim 1, characterized in that the tester includes
Inductor, the inductor pass through the position adjustment structure being arranged in the one side wall of mold and are removably mounted on mold.
9. the test device of Dry Shrinkage of Cement Mortar according to claim 8, characterized in that the inductor has solid
Determine screw rod, the position adjustment structure is then included in opening sliding slot, inductor on mould side wall along the setting of cavity depth direction
Standing screw and two adjusting nuts being arranged on standing screw, the sliding slot central axes and mould side wall along die cavity depth
The central axes spent on direction are overlapped, and the trough width is equal to or slightly greater than inductor standing screw diameter, the adjusting nut
Outer profile size is greater than sliding slot.
10. the test device of Dry Shrinkage of Cement Mortar described according to claim 1 or 2 or 3 or 5 or 6 or 7 or 8 or 9,
It is characterized in, the tester is detector for displacement measuring or measuring stress instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821215886.1U CN208672633U (en) | 2018-07-30 | 2018-07-30 | A kind of test device of Dry Shrinkage of Cement Mortar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821215886.1U CN208672633U (en) | 2018-07-30 | 2018-07-30 | A kind of test device of Dry Shrinkage of Cement Mortar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208672633U true CN208672633U (en) | 2019-03-29 |
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ID=65832079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821215886.1U Active CN208672633U (en) | 2018-07-30 | 2018-07-30 | A kind of test device of Dry Shrinkage of Cement Mortar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208672633U (en) |
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2018
- 2018-07-30 CN CN201821215886.1U patent/CN208672633U/en active Active
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Effective date of registration: 20190916 Address after: 510000 Huashan Town, Yucun and Yudafeng Industrial Zone, Huadu District, Guangzhou City, Guangdong Province Co-patentee after: GUANGDONG LADOS NEW MATERIAL CO., LTD. Patentee after: Guangzhou Shengfeng Concrete Co., Ltd. Address before: 510000 No. eight, Lane 101, Changsha South Street, Tung Chung Town, Guangzhou, Guangdong, 44, Nansha District Patentee before: GUANGDONG LADOS NEW MATERIAL CO., LTD. |