CN205483716U - Cement -based materials I - type test piece restraint shrinkage test mould - Google Patents
Cement -based materials I - type test piece restraint shrinkage test mould Download PDFInfo
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- CN205483716U CN205483716U CN201620028216.3U CN201620028216U CN205483716U CN 205483716 U CN205483716 U CN 205483716U CN 201620028216 U CN201620028216 U CN 201620028216U CN 205483716 U CN205483716 U CN 205483716U
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- cement
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- based material
- test specimen
- plate
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Abstract
The utility model discloses a cement -based materials I - type test piece restraint shrinkage test mould, including the rectangle bottom plate, bottom plate upper surface middle part symmetry is provided with two the same semicircle boards, two circular arc limits of semicircle board are located between two diameter limits, two semicircle boards are all along splitting into two fixed plates that the shape is the same and set up the detaching board between two fixed plates rather than diameter limit vertically direction, two semicircle boards are outer along being provided with the detachable frame, the surface of frame with edgewise flushing of bottom plate, the diameter limit of two semicircle boards is hugged closely to the frame internal surface. The utility model is simple in operation, it is convenient, can observe the record crack condition directly perceivedly, be applicable to cement -based materials's restraint shrink and fracture initiation tests.
Description
Technical field
This utility model relates to a kind of mould, in particular, relates to a kind of cement-based material I-type test specimen about
Bundle shrinkage test mould.
Background technology
Cement-based material includes cement concrete, cement-based mortar, concrete base cleaning pulp, is civil engineering and water conservancy
One of the most widely used construction material of hydroelectric project.This kind of cement-based material has individual feature, it is simply that easily open
Split.Once there is crack in cement-based material, will destroy the integrity of structure, reduces the durable of cement-based material
Property, cause the service function of cement-based material structure partially or completely to be lost, this needs to expend substantial amounts of manpower
Material resources carry out reinforcing and even rebuild.Therefore, how to assess and suppress the cracking of cement-based material to become engineering
The problem that technos is urgently to be resolved hurrily.
The factor causing cement-based material to ftracture is diversified, including cement-based material itself character, execute
Working medium amount, temperature control measures, weather conditions etc., wherein dry shrinkage, self-constriction and temperature shrinkage are to cause water
The main cause of cement-based material cracking.It is correctly detected and evaluates contraction and the cracking performance of cement-based material, be
Take measures effectively to suppress or avoid the premise of cracking.Study cement-based material restrained shrinkage the most both at home and abroad
Test method mainly has flat band method, ring method and single shaft method.This kind of test method operation complexity, result discreteness
Greatly, difficulty is evaluated high.
Utility model content
The purpose of this utility model is to overcome deficiency of the prior art, it is provided that a kind of cement-based material I-type
Test specimen restrained shrinkage test mould, it is possible to sizing more simply and easily prepares cement-based material I-type test specimen, test
Time test specimen radial constraint is provided, it is possible to the directly perceived situation observing test specimen crack, be convenient for measuring fracture width, in order to
Study restrained shrinkage and the cracking performance of cement-based material more accurately, for formulating cement-based material cracking behavior from now on
Test method specification can provide foundation.
The purpose of this utility model is achieved through the following technical solutions.
Cement-based material I-type test specimen restrained shrinkage test mould of the present utility model, including rectangular base plate, described
Being symmetrically arranged with two identical semi-circular plates in the middle part of plate upper surface, two arc-shaped edges of described semi-circular plate are positioned at two
Between bar diameter limit, it is identical that said two semi-circular plate is all divided into two shapes along the direction vertical with its diameter limit
Fixed plate and the stripper that is arranged between two fixed plates；Said two semi-circular plate outer is provided with detachably
Frame, the outer surface of described frame flushes with the edgewise of described base plate, and described frame inner surface is close to two and half
The diameter limit of plectane.
Minimum range between the arc-shaped edges of said two semi-circular plate is equal to the thickness of semi-circular plate.
The height of described frame is equal to the thickness of described semi-circular plate.
Described frame is consisted of bolt assembling symmetrical two parts.
Described fixed plate and stripper are all connected by bolt and described base plate are fixing.
Described base plate lower surface is fixedly installed bearing.
Compared with prior art, the technical solution of the utility model is had the benefit that
(1) this utility model, by base plate, frame and the cooperation of two semi-circular plates, can make easily
Finalize cement-based material I-type test specimen, prepare for the test of cement-based material restrained shrinkage；
(2) in this utility model, by base plate, frame and the cooperation of two semi-circular plates, prepared cement matrix
Material I-type test specimen is symmetric about the axis, and the cross section in the middle of test specimen is minimum, is substantially at uniform tension stress state；
(3), after this utility model prepares cement-based material I-type test specimen, tearing open in frame and two semi-circular plates is removed
Unloading plate, when test specimen shrinks, two fixed plates do not removed in each semi-circular plate provide radial constraint to test specimen；
(4) the cement-based material I-type test specimen two ends size that this utility model prepares is minimum much larger than in the middle of test specimen cuts
At face, at smallest cross-sectional, subjected to stress is maximum, in order to induce test specimen to ftracture at smallest cross-sectional, in advance during test
Know that crack location is at the smallest cross-sectional in the middle of test specimen.
(5) this utility model is simple, convenient, it is possible to intuitively observed and recorded crack occur time, split
The quantity of seam and width etc., provide foundation for the restrained shrinkage with post analysis cement-based material with cracking performance.
Accompanying drawing explanation
Fig. 1 is top view of the present utility model.
Fig. 2 is the top view that this utility model is not outlined.
Fig. 3 is the front view of Fig. 2.
Fig. 4 is the structural representation of semi-circular plate in Fig. 1.
Fig. 5 is the structural representation of frame in Fig. 1.
Reference: 1 test specimen 2 base plate 3 frame 4 bolt 5 bearing 6 fixed plate 7 stripper
Detailed description of the invention
With embodiment, this utility model is described in detail below in conjunction with the accompanying drawings.
As shown in Figures 1 to 5, cement-based material I-type test specimen restrained shrinkage test mould of the present utility model,
Including carrying test specimen rectangular base plate 2, described base plate 2 lower surface is fixedly installed bearing 5, described bearing 5 to
Being set to three less, described base plate 5 upper surface middle part is symmetrically arranged with two identical semi-circular plates, described semicircle
Two arc-shaped edges of plate minimum range between two diameter limits, between the arc-shaped edges of said two semi-circular plate
Equal to the thickness of semi-circular plate, said two semi-circular plate is all divided into two shapes along the direction vertical with its diameter limit
Identical fixed plate 6 and the stripper 7 being arranged between two fixed plates 6, the base of said two fixed plate 6
With the diameter limit that the base of stripper 6 collectively forms a semi-circular plate, described fixed plate 6 and stripper 7 are the most logical
Cross that bolt 4 is fixing with described base plate 2 to be connected, during test, described stripper 7 can be removed as required.Described two
Individual semi-circular plate outer is provided with a dismountable frame 3, and described frame 3 can be passed through bolt by symmetrical two parts
4 assemble composition, and the height of described frame 3 is equal to the thickness of described semi-circular plate, the outer surface of described frame 3 and institute
The edgewise stating base plate 2 flushes, and the inner surface of described 3 two relative edges of frame is close to the diameter limit of two semi-circular plates,
It is to say, the thickness of described frame 3 is equal to the distance between diameter limit and base plate 2 edgewise of semi-circular plate.
In this utility model, the material of each parts all can be selected for the materials such as steel, plastics or hardwood.Doing different material
During the test expected, size of the present utility model can be modified as required.
Test method based on above-mentioned cement-based material I-type test specimen restrained shrinkage test mould, comprises the following steps:
First, stirring prepares cement-based material to be tested, stirs in being placed in mortar mixer；Cleaning
Assembly jig, coats a thin layer lubricant at clean mould inner surface, such as machine oil etc., it is simple to form removal and guarantor
Card fixed plate 6 provides radial constraint to test specimen；
Secondly, the cement-based material being stirred is poured in ready mould, shapes, available pocket knife etc.
Plug and pound and be placed in vibration compacting on vibration table；
Finally, the I-type test specimen of molding of vibrating is placed in standard curing room (20 ± 1 DEG C, relative humidity more than 95%)
Interior 24h～48h, then removes frame 3 and two strippers 7, and by test specimen holding chamber, every day records twice
Temperature and relative humidity, observe and record the situation such as time, the quantity in crack and width that crack occurs；According to
Need repeatable above-mentioned steps to make multiple test specimens, obtain organizing test data more.
Specific embodiment of the utility model:
Each part dimension in this utility model, base plate 2 is set to rectangle, a length of 270mm, and width is 240mm,
Thickness is 10mm；The diameter limit of semi-circular plate is close and parallel with the edgewise of base plate 270mm length, the diameter of semi-circular plate
For 200mm, thickness is 20mm, a length of 50mm in base of fixed plate 6, a length of 100mm in base of stripper 7；
The thickness of frame 3 is 10mm；Bearing 5 height is 45mm.
The proportioning of cement mortar, water: cement: sand=1:2:5 (mass ratio), wherein, water is ordinary tap water,
Cement is 42.5 grades of normal silicate water of Camel P.O that Tianjin cement branch company of cement limited company produces
Mud, sand is natural river sand, continuous grading, and modulus of fineness is 2.0.
Before test, mould inner surface of the present utility model is cleaned out, puts the oil.Cement mortar is placed in mortar
Stir in blender, then pour in mould of the present utility model, standard curing room (20 ± 1 DEG C, phase
To humidity more than 95%) remove frame 3 and two strippers 7 after interior maintenance 24h, i.e. can obtain test required
I-type test specimen, by test specimen holding chamber, record twice temperature and relative humidity every day, record the results are shown in Table 1
Shown in.Observing the shrinkage cracking situation of test specimen, repeat the above steps makes six test specimens, sees look into record six groups
Data are as shown in table 2: (expection crack location is the narrowest section in the middle of test specimen)
Table 1
Table 2
Note: crack peak excursion distance refers to actual crack distance expection crack location vertical dimension maximum.
Although being described function of the present utility model and work process above in conjunction with accompanying drawing, but this practicality is new
Type is not limited to above-mentioned concrete function and work process, and above-mentioned detailed description of the invention is only schematically,
Rather than restrictive, those of ordinary skill in the art is under enlightenment of the present utility model, without departing from this reality
In the case of novel objective and scope of the claimed protection, it is also possible to make a lot of form, these belong to
Within protection of the present utility model.
Claims (6)
1. a cement-based material I-type test specimen restrained shrinkage test mould, including rectangular base plate, it is characterised in that
Two identical semi-circular plates it are symmetrically arranged with, two arc-shaped edges positions of described semi-circular plate in the middle part of described plate upper surface
Between two diameter limits, said two semi-circular plate is all divided into two shapes along the direction vertical with its diameter limit
Identical fixed plate and the stripper being arranged between two fixed plates；Said two semi-circular plate outer is provided with can
The frame of dismounting, the outer surface of described frame flushes with the edgewise of described base plate, and described frame inner surface is close to two
The diameter limit of individual semi-circular plate.
Cement-based material I-type test specimen restrained shrinkage test mould the most according to claim 1, it is characterised in that
Minimum range between the arc-shaped edges of said two semi-circular plate is equal to the thickness of semi-circular plate.
Cement-based material I-type test specimen restrained shrinkage test mould the most according to claim 1, it is characterised in that
The height of described frame is equal to the thickness of described semi-circular plate.
Cement-based material I-type test specimen restrained shrinkage test mould the most according to claim 1, it is characterised in that
Described frame is consisted of bolt assembling symmetrical two parts.
Cement-based material I-type test specimen restrained shrinkage test mould the most according to claim 1, it is characterised in that
Described fixed plate and stripper are all connected by bolt and described base plate are fixing.
Cement-based material I-type test specimen restrained shrinkage test mould the most according to claim 1, it is characterised in that
Described base plate lower surface is fixedly installed bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620028216.3U CN205483716U (en) | 2016-01-13 | 2016-01-13 | Cement -based materials I - type test piece restraint shrinkage test mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620028216.3U CN205483716U (en) | 2016-01-13 | 2016-01-13 | Cement -based materials I - type test piece restraint shrinkage test mould |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205483716U true CN205483716U (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620028216.3U Expired - Fee Related CN205483716U (en) | 2016-01-13 | 2016-01-13 | Cement -based materials I - type test piece restraint shrinkage test mould |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205483716U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466745A (en) * | 2016-01-13 | 2016-04-06 | 天津大学 | Cement-based material I-type test piece restraining shrinkage test mold and method |
-
2016
- 2016-01-13 CN CN201620028216.3U patent/CN205483716U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466745A (en) * | 2016-01-13 | 2016-04-06 | 天津大学 | Cement-based material I-type test piece restraining shrinkage test mold and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20180113 |