CN205620231U - Concrete cracking resistance rapid measurement device - Google Patents
Concrete cracking resistance rapid measurement device Download PDFInfo
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- CN205620231U CN205620231U CN201620331310.6U CN201620331310U CN205620231U CN 205620231 U CN205620231 U CN 205620231U CN 201620331310 U CN201620331310 U CN 201620331310U CN 205620231 U CN205620231 U CN 205620231U
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- crack
- induced
- internal ring
- outer shroud
- concrete
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- 238000005336 cracking Methods 0.000 title abstract description 16
- 238000005259 measurement Methods 0.000 title abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000011156 evaluation Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 230000008602 contraction Effects 0.000 description 4
- 229920006351 engineering plastic Polymers 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000004035 construction material Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a concrete cracking resistance rapid measurement device, including the induced inner ring in bottom plate, outer loop and crack, the induced inner ring setting in outer loop and crack be in on the bottom plate, the induced inner ring in outer loop and crack be circular, just the induced inner ring in crack be the concentric circles with the outer loop, be equipped with the induced generator of 2 stress on the induced inner ring in crack, the utility model has the advantages of: simple structure adopts the inner ring to add the induced generator of stress, and induced cement -based materials's fracture can make fissured position more fixed, is convenient for observe to having shortened time and probability that article one crack appears, thereby having realized the cracking resistance of the different concrete of evaluation of quick accuracy, convenient to use has improved work efficiency.
Description
Technical field
This utility model relates to a kind of crack-resistant performance of concrete rapid determination device, belongs to construction material performance test field.
Background technology
Along with industrialization and the development of urbanization, the expansion of infrastructure construction scale, concrete has become main construction material.But, cast-in-place build concrete cracking phenomenon in the buildings such as bridge, tunnel, house and happen occasionally, have a strong impact on the durability of xoncrete structure.After concrete cracking, extraneous harmful ion enters concrete, destroys internal structure, causes steel bar corrosion, has a negative impact concrete durability.The tension produced due to own vol deformation in concrete is the major reason causing concrete that cracking occurs, and this also becomes one of current concrete structure durability study hotspot.Traditional concrete performance experimentation concentrates on the basic mechanical performances such as comprcssive strength, tensile strength, elastic modelling quantity, and the test to cracking resistance does not forms unified effectively evaluating method.
Affect a lot of because have of crack-resistant performance of concrete, mainly have limit stretch value, axial tensile strength, elastic modelling quantity, linear expansion coefficient, aquation temperature rise, creep, self-constriction, dry shrinkage etc..For a long time, Chinese scholars have employed various constrained test method to study concrete cracking resistance sensitivity in early days, wherein have: flat board constrained test, its evaluation methodology uses measurement crack length or the method for width substantially, simple to operation, but concrete shrinkage can only be provided the contraction distortion that part is uneven, existing defects in terms of the quantization in crack and later stage process, it is impossible to accurate characterization crack-resistant performance of concrete；Single shaft leash law, is generally used for the cracking that assessment causes because of temperature action, it is possible to provides mix-design foundation for the concrete such as road, large volume, but is not easy to carry out Site Detection, and instrumental sensitivity requires height, relatively costly；Ring method, use ring method measure cement-based material cracking resistance be that a little experimental provision is fairly simple, the steel loop of closing provides constraint in natural annular, it is to avoid end structure design complicated during single shaft constraint.But it is long that traditional ring method measures the time, and the constraint to concrete that experimental provision can provide is limited.
Utility model content
In order to solve the problems referred to above, this utility model devises a kind of crack-resistant performance of concrete rapid determination device, can be to including that the early anti-cracking behavior such as mass concrete, road can be tested, thus realize evaluating rapidly and accurately the cracking resistance of different concrete, simple in construction, easy to use, improve work efficiency.
The technical solution of the utility model is:
Crack-resistant performance of concrete rapid determination device, including base plate, outer shroud and crack-induced internal ring, described outer shroud and crack-induced internal ring are arranged on described base plate, and described outer shroud and crack-induced internal ring are circle, and described crack-induced internal ring is concentric circular with outer shroud；Described crack-induced internal ring is provided with 2 stress induced generators.
Further, described stress induced generator is that angle steel is welded on crack-induced internal ring, and length is highly consistent with internal ring, and welding position is on two end points of annular diameters.
Further, described base plate is provided with two step cutting patterns, and outer diameter of step is interior through identical with described outer shroud, and another outer diameter of step is identical with the external diameter of described internal ring.
Further, described outer shroud is made up of two semicircular ring, is provided with rib at the edge of semicircular ring, and two described semicircular ring by the detachable connection of described rib and are fixed on described base plate.
The steel that base plate, outer shroud and crack-induced internal ring in this utility model patent is not less than 5mm, flatness tolerance no more than 0.05mm by thickness are made.Wherein, base plate may be used without engineering plastics, when using engineering plastics, tests complete reply device every time and checks, base plate no significant defect can be continuing with.
The utility model has the advantage of: simple in construction, internal ring is used to add stress induced generator, the cracking of induction cement-based material can make the position in crack more be fixed, it is easy to observe, and shorten time and probability that Article 1 crack occurs, it is achieved thereby that evaluate the cracking resistance of different concrete fast and accurately, easy to use, improve work efficiency.
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the top view of this utility model embodiment；
Fig. 2 is the profile of this utility model embodiment；
In figure: 1-base plate, 2-outer shroud, 3-crack-induced internal ring, the stress induced generator of 4-, 5-rib, 6-internal layer platform, 7-outer layer platform.
Detailed description of the invention
Hereinafter preferred embodiment of the present utility model is illustrated, it will be appreciated that preferred embodiment described herein is merely to illustrate and explains this utility model, be not used to limit this utility model.
As shown in Figure 1-2, this utility model is a kind of crack-resistant performance of concrete rapid determination device, it is made up of base plate 1, outer shroud 2, crack-induced internal ring 3 and stress induced generator 4, two step cutting patterns are set on described base plate 1 so that inside and outside two rings can be fixed in experimentation, interior stepped diameters is through identical in 270mm, with crack-induced internal ring, the radius 300mm of outer step, with in outer shroud through identical, see Fig. 2.Outer shroud 2 is fixed with bolt by rib 5, makes crack-induced internal ring and outer shroud be fixed on base plate 1.Crack-induced internal ring height 145mm, outer shroud height 150mm, step cutting pattern height is respectively 5mm.Described stress induced generator 4 is two, uses 40mm × 40mm angle steel to be respectively welded on two end points of crack-induced internal ring 3 diameter, and the corner angle of stress induced generator are 90 degree, and its height is identical with crack-induced internal ring height.
The steel that base plate, outer shroud and crack-induced internal ring in this utility model patent is not less than 5mm, flatness tolerance no more than 0.05mm by thickness are made.Wherein, base plate may be used without engineering plastics, when using engineering plastics, tests complete reply device every time and checks, base plate no significant defect can be continuing with.
The method of testing of this utility model device is:
Install and fix device as illustrated, by concreting to be measured between outer shroud 2 and crack-induced internal ring 3, after 24h initial set, remove outer shroud.The dry shrinkage that concrete produces chemical shrinkage and desiccation generation because of hydrated cementitious does with there will be volume reduction and the phenomenon of contraction distortion, when concreting is made annulus in ring, effect of contraction due to becket is prevented from by the contraction process of concrete, thus in concrete ring, cause hoop tension, when tension exceedes tensile strength, concrete ftractures, stress induced generator on crack-induced internal ring improves the tension of concrete local, the concrete making each strength grade can ftracture in induction position, it is easy to observe in induction position and measure the cracking moment of concrete, by the difference of crack time of occurrence, the cracking resistance of different concrete is compared.
Claims (1)
1. crack-resistant performance of concrete rapid determination device, it is characterized in that: include base plate, outer shroud and crack-induced internal ring, described outer shroud and crack-induced internal ring are arranged on described base plate, and described outer shroud and crack-induced internal ring are circle, and described crack-induced internal ring is concentric circular with outer shroud；Described crack-induced internal ring is provided with 2 stress induced generators；Described stress induced generator is that angle steel is welded on crack-induced internal ring, and length is highly consistent with internal ring, and welding position is on two end points of annular diameters；Described base plate is provided with two step cutting patterns, and outer diameter of step is interior through identical with described outer shroud, and another outer diameter of step is identical with the external diameter of described internal ring；Described outer shroud is made up of two semicircular ring, is provided with rib at the edge of described semicircular ring, and two described semicircular ring by the detachable connection of described rib and are fixed on described base plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620331310.6U CN205620231U (en) | 2016-04-19 | 2016-04-19 | Concrete cracking resistance rapid measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620331310.6U CN205620231U (en) | 2016-04-19 | 2016-04-19 | Concrete cracking resistance rapid measurement device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205620231U true CN205620231U (en) | 2016-10-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620331310.6U Expired - Fee Related CN205620231U (en) | 2016-04-19 | 2016-04-19 | Concrete cracking resistance rapid measurement device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205620231U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414732A (en) * | 2018-05-28 | 2018-08-17 | 华南理工大学 | A rapid test device for crack resistance of cement-based materials with outer circle and inner square |
| CN108535459A (en) * | 2018-05-03 | 2018-09-14 | 华南理工大学 | A rapid test device for crack resistance of cement-based materials |
| CN110261226A (en) * | 2019-07-09 | 2019-09-20 | 武汉理工大学 | A device and method for testing the crack resistance of ultra-high performance concrete |
-
2016
- 2016-04-19 CN CN201620331310.6U patent/CN205620231U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108535459A (en) * | 2018-05-03 | 2018-09-14 | 华南理工大学 | A rapid test device for crack resistance of cement-based materials |
| CN108414732A (en) * | 2018-05-28 | 2018-08-17 | 华南理工大学 | A rapid test device for crack resistance of cement-based materials with outer circle and inner square |
| CN110261226A (en) * | 2019-07-09 | 2019-09-20 | 武汉理工大学 | A device and method for testing the crack resistance of ultra-high performance concrete |
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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 |
Granted publication date: 20161005 |
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| CF01 | Termination of patent right due to non-payment of annual fee |