CN208721675U - A kind of crack resistance - Google Patents
A kind of crack resistance Download PDFInfo
- Publication number
- CN208721675U CN208721675U CN201820644956.9U CN201820644956U CN208721675U CN 208721675 U CN208721675 U CN 208721675U CN 201820644956 U CN201820644956 U CN 201820644956U CN 208721675 U CN208721675 U CN 208721675U
- Authority
- CN
- China
- Prior art keywords
- steel loop
- interior steel
- crack resistance
- interior
- resistance according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a kind of crack resistances, including cracking resistance device, several foil gauges connected with computer circuits, the cracking resistance device includes stepped bottom plate, the annular exterior sheathing and interior steel loop being concentrically disposed on the stepped bottom plate from outside to inside, the foil gauge is uniformly arranged in the circumferential direction on the interior steel loop internal perisporium, induced cracking component is provided on the interior steel loop periphery wall, the induced cracking component includes annular Ribbed Bar, several angle steel, the angle steel is uniformly arranged in the circumferential direction in the interior steel loop periphery wall, the annular Ribbed Bar is fixed on interior steel loop periphery wall.The utility model structure is simple, easy to operate, solves the problems, such as that existing annulus cracking resistance device generally existing experimental period is long, crack is not easy to observe.
Description
Technical field
The utility model relates to construction material performance test, in particular to a kind of anti-cracking performance of cement base material is quickly tested
Device.
Background technique
The cement-based materials such as mortar and concrete are the most common construction materials of building engineering field, and superior performance obtains
To the generally approval of people in the industry.As infrastructure process in China's is substantially accelerated, the cement such as large batch of mortar and concrete
Sill is come into operation extensively, and at the same time, feature easy to crack also exposes in practical projects for cement mortar or concrete
Out.The appearance in crack in engineering structure, on the one hand affects the beauty of building, and the appearance in another aspect crack is greatly dropped
The low bearing capacity of building structure, even harmful substance enter corrosion reinforcing bar and provide channel, reduce the durability of structure.
Therefore on sound lines simple, quickly detection and evaluation cement mortar and concrete cracking performance is adopted, to prevention and disposition
The problem of Cracking of building is of great significance.
The early anti-cracking behavior that circularly restrained shrinkage anti-cracking method is applied to cement-based material relatively broadly at present can be commented
Estimate, provide uniform restraint radially and tangentially to cement-based material simultaneously with steel annulus when experiment, prevents it from free shrink,
The cement-based material of different mixture ratio, the cement-based material that different temperatures damp condition conserves can be detected using this method and are mixed
Enter the cracking behaviors of cement-based material under different additives.But this annulus constraint test method has certain limitation, right
In the stronger concrete of certain crack resistances, the degree of restraint deficiency that the annulus of concrete shrinkage provides is limited, cement matrix is caused
Expect that cracking time is longer, crack is difficult to observe, or even the crack being visible by naked eyes in the entire experiment process.Therefore, at present urgently
A kind of new cement-based material anti-cracking performance evaluating apparatus and measuring method are needed, it should meet, and detection device is simple, tests
Period is relatively short, crack is obvious, requires convenient for observation etc., for detecting the cracking resistance of cement-based material, to realize work
Journey application.
Utility model content
The purpose of the utility model is to overcome deficiencies in the prior art, provide a kind of very fast measurement cement-based material cracking resistance
The evaluating apparatus of performance can solve the problems, such as that the test period existing for existing evaluation method is long, should not observe crack.
The utility model is realized using scheme below:
A kind of crack resistance, including cracking resistance device, several connected with computer circuits
Foil gauge, the cracking resistance device includes stepped bottom plate, is concentrically disposed on the stepped bottom plate from outside to inside
Annular exterior sheathing and interior steel loop, the foil gauge is uniformly arranged in the circumferential direction on the interior steel loop internal perisporium, outside the interior steel loop
Induced cracking component is provided on peripheral wall, the induced cracking component includes annular Ribbed Bar, several angle steel, the angle steel edge
It is circumferentially uniformly arranged on the interior steel loop periphery wall, the annular Ribbed Bar is fixed on interior steel loop periphery wall.
This programme is overcome by the way that angle steel and Ribbed Bar induction cement-based material cracking is arranged in the interior steel loop periphery wall
Lead to the longer disadvantage of cracking time since constraint is insufficient in annulus experiment, increases annulus cracking sensitivity, greatly shorten
Test carries out time.Wherein its effect of Ribbed Bar is mainly used for enhancing degree of restraint in cement-based material contraction process,
Increase cracking sensitivity.
Further, the stepped bottom plate is made of steel, and bottom surface is square, and top surface has been concentrically disposed with two
A round boss to match respectively with the internal diameter of the annular exterior sheathing and interior steel loop.
Further, the annular exterior sheathing includes two semicircle plastic formworks, two semicircle plastic formworks by pair
Connecting bolt is linked together, and facilitates installation and dismounting.
Further, the Ribbed Bar is along the circumferential direction welded in the half height of the interior steel loop periphery wall
Position.Easily there is crack in test specimen at this, and the Ribbed Bar is constrained by itself greater stiffness and what thread protrusion caused answers
Power is concentrated, and cement-based material rapid crack propagation is induced.
Further, the angle steel is circumferentially respectively welded at the quarterline that the interior steel loop periphery wall is arranged in, together
When be welded to from half height from top along interior steel loop is axial, it is ensured that the constraint of cement-based material is uniformly distributed, and
Stress concentration is formed at leg of angle back, convenient for observing the cracking resistance of concrete.
Further, it is 10-16mm that the Ribbed Bar, which selects diameter, provides enough inducing actions for cement-based material.
Further, the foil gauge is circumferentially separately positioned at the quarterline of the interior steel loop internal perisporium, and
Positioned at the half height and position of the interior steel loop.Under the effect of induced cracking component, cement-based material most easily goes out here
Existing crack, the foil gauge, which is set to this, can quickly obtain crack data of the cement-based material under constraint condition.
Further, the interior steel loop internal diameter is highly 80-120mm with a thickness of 20-30mm for 140-150mm.Institute
The interior steel loop stated can provide concrete medial surface the circumferential deformation constraint of enough rigidity, make cement matrix under the size
Expect rapid crack propagation；Ensure that its medial surface foil gauge can detecte out the mutation strained simultaneously.
Further, the radius of the semicircle plastic formwork is 200-220mm, is highly 80-120mm.The size
It is arranged on the basis for reducing experimental material dosage while guarantees that the interior steel loop and the outer plastic formwork spacing are big
In the maximum aggregate size of cement-based material.
Compared with prior art, which has the advantages that
The utility model induces cement-based material cracking by setting angle steel, Ribbed Bar component, overcomes annulus experiment
In since constraint is insufficient lead to the longer disadvantage of cracking time, increase annulus cracking sensitivity, substantially reduce test and carry out
Time.The foil gauge and COMPUTER DETECTION device of mating setting can pass through the strain variation real-time monitoring cement matrix of inner ring
Expect the deformation in cracking, Accurate Determining cracking time relatively accurately measures the cracking resistance of cement-based material.
Detailed description of the invention
Fig. 1 is the utility model mold overlooking structure diagram；
Fig. 2 is the A-A the schematic diagram of the section structure of the utility model mold；
Fig. 3 a is the axial schematic diagram of Ribbed Bar in induced cracking component；
Fig. 3 b is the schematic cross-section of Ribbed Bar in induced cracking component；
Fig. 4 is the schematic cross-section of angle steel in induced cracking component.
Figure label explanation: 1- step type bottom plate, 2- semicircle plastic formwork, 3- Ribbed Bar, steel loop, 5- strain in 4-
Piece, 6- angle steel, 7- are to connecting bolt.
Specific embodiment
To keep the purpose of this utility model, technical solution and advantage clearer, below will by specific embodiment and
Relevant drawings are described in further detail the utility model.
As shown in Figure 1 and 2, a kind of crack resistance, including cracking resistance device, work strain
Piece 5 and computer, wherein cracking resistance device includes stepped bottom plate 1, interior steel loop 4, annular exterior sheathing and induced cracking component, institute
The interior steel loop internal diameter stated is highly 100mm with a thickness of 25mm for 150mm, and the induced cracking component is by Ribbed Bar 3 and angle
Steel 6 is composed.The annular exterior sheathing by two semicircular plastic formwork 2 by being connected to connecting bolt 7 in joint, described half
The radius of circle plastic formwork 2 is 210mm, is highly 100mm.The stepped bottom plate is made of steel, bottom surface 500mm
The square of × 500mm, total height 50mm, the round boss being arranged concentrically on stairstepping bottom plate 1 have two-stage ladder, annular
Exterior sheathing is stuck on first order ladder, and interior steel loop 4 is stuck on the ladder of the second level.
4 periphery wall of interior steel loop is provided with induced cracking component, including Ribbed Bar 3 and angle steel 6, for enhancing cement
Degree of restraint in sill contraction process increases cracking sensitivity.As shown in Figure 3a and Figure 3b shows, the Ribbed Bar 3 is selected directly
Diameter is the HPB400 reinforcing bar of 12mm, and reinforcing bar is welded along interior 4 outer circumference face of steel loop, and is welded in interior 4 outside half of steel loop
At height and position；As shown in figure 4,6 steel of angle steel select Q235 steel, specification is L30 × 30 × 4,6 two edges of angle steel
It is welded in interior 4 periphery wall of steel loop, it is axial from the half height that top is welded to interior steel loop 4 along interior steel loop 4.The interior steel loop
4 internal perisporiums are provided with foil gauge 5, and the foil gauge 5 is respectively set at interior 4 internal perisporium quarterline of steel loop, and is respectively positioned on institute
The position of interior 4 short transverse half of steel loop is stated, records 4 micro-strain of interior steel loop for incuding, passes through strain record reflection
The cracking time of confined concrete.
Using the anti-cracking performance of cement base material rapid assay methods of described device, comprising steps of
Step 1: be coated with machine oil at the inner surface of annular exterior sheathing after device is completed, to prevent itself and mortar or
Concrete binding；
Step 2: pouring mortar or concrete between annular exterior sheathing and interior steel loop 4, outer ring is removed after being conserved for 24 hours
Shape exterior sheathing obtains cement-based material ring；
Step 2: sealing the upper surface of the cement-based material ring using waterproof material such as epoxy resin, and place it in
It is conserved in the environment that temperature is 20 ± 2 DEG C and humidity is 40%-70%；
Step 3: the strain in observational record on steel loop, if mutating the mortar or concrete indicated at the height
Cracking, records the cracking time of cement-based material ring, while observing the fracture width of cement-based material ring outer surface, length, with
The early age cracking resistance of cracking time and the development condition in crack evaluation cement-based material ring.
The purpose of this utility model, technical solution and advantage is further described in detail in present embodiment, institute
It should be noted that the above is only the preferred embodiment of the utility model only, be not intended to limit the utility model, it is all
Within the spirit and principles of the utility model, it is practical new to should be included in this for made any modifications, equivalent replacements, and improvements etc.
In the protection scope of type.
Claims (9)
1. a kind of crack resistance, including cracking resistance device, several connected with computer circuits
Foil gauge, the cracking resistance device includes stepped bottom plate, the ring that is concentrically disposed on the stepped bottom plate from outside to inside
Shape exterior sheathing and interior steel loop, the foil gauge are uniformly arranged in the circumferential direction on the interior steel loop internal perisporium, the interior steel loop periphery
Induced cracking component is provided on wall, it is characterised in that: the induced cracking component includes annular Ribbed Bar, several angle steel,
The angle steel is uniformly arranged in the circumferential direction in the interior steel loop periphery wall, and the annular Ribbed Bar is fixed on interior steel loop periphery wall
On.
2. crack resistance according to claim 1, it is characterised in that: the ladder
Type bottom plate is made of steel, and bottom surface is square, top surface be concentrically disposed with there are two respectively with the annular exterior sheathing and interior
The round boss that the internal diameter of steel loop matches.
3. crack resistance according to claim 1, it is characterised in that: the annular
Exterior sheathing includes two semicircle plastic formworks, and two semicircle plastic formworks are by being linked together connecting bolt.
4. crack resistance according to claim 1, it is characterised in that: described is with ribbing
Reinforcing bar is along the circumferential direction welded in the half height and position of the interior steel loop periphery wall.
5. crack resistance according to claim 1, it is characterised in that: the angle steel edge
It is circumferentially respectively welded at the quarterline that the interior steel loop periphery wall is set, while being axially welded to two points from top along interior steel loop
One of height at.
6. crack resistance according to claim 1, it is characterised in that: the band rib steel
It is 10-16mm that muscle, which selects diameter,.
7. crack resistance according to claim 1, it is characterised in that: the foil gauge
It is circumferentially separately positioned at the quarterline of the interior steel loop internal perisporium, and is respectively positioned on the half height of the interior steel loop
Position.
8. crack resistance according to claim 1, it is characterised in that: the interior steel
Ring internal diameter is highly 80-120mm with a thickness of 20-30mm for 140-150mm.
9. crack resistance according to claim 3, it is characterised in that: the semicircle
The radius of plastic formwork is 200-220mm, is highly 80-120mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820644956.9U CN208721675U (en) | 2018-05-03 | 2018-05-03 | A kind of crack resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820644956.9U CN208721675U (en) | 2018-05-03 | 2018-05-03 | A kind of crack resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208721675U true CN208721675U (en) | 2019-04-09 |
Family
ID=65970256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820644956.9U Active CN208721675U (en) | 2018-05-03 | 2018-05-03 | A kind of crack resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208721675U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108535459A (en) * | 2018-05-03 | 2018-09-14 | 华南理工大学 | A kind of crack resistance |
-
2018
- 2018-05-03 CN CN201820644956.9U patent/CN208721675U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108535459A (en) * | 2018-05-03 | 2018-09-14 | 华南理工大学 | A kind of crack resistance |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Dong et al. | Experimental studies on void detection in concrete-filled steel tubes using ultrasound | |
| CN106918550B (en) | A kind of optical fiber sensing monitoring steel bar corrosion method | |
| CN101738459B (en) | Expansion/shrinkage stress testing device for cement-based material | |
| CN101769916B (en) | Method for testing expansion/contraction stress of cement-based material | |
| CN103995023B (en) | Concrete filled steel tubular member tube wall peels off defect inspection method with concrete interface | |
| Goszczyńska | Analysis of the process of crack initiation and evolution in concrete with acoustic emission testing | |
| CN102608296B (en) | Device and method for simulating and monitoring expanding and cracking of concrete | |
| CN107748106A (en) | A kind of asphalt stretches dynamic modulus method of testing | |
| Wu et al. | Quantitative strain measurement and crack opening estimate in concrete structures based on OFDR technology | |
| CN108535459A (en) | A kind of crack resistance | |
| CN208721675U (en) | A kind of crack resistance | |
| US6783273B1 (en) | Method for testing integrity of concrete shafts | |
| CN208847736U (en) | A kind of test device of quick measurement concrete early-stage crack resistance | |
| CN104807982A (en) | Method for determining final setting time of concrete based on strain sensors | |
| KR102021039B1 (en) | An evaluation method of early concrete solidity using non-destructive testing | |
| CN205620231U (en) | Concrete cracking resistance rapid measurement device | |
| CN105466833B (en) | Load action concrete hole structure evolution in-situ monitoring method and experimental rig | |
| CN208383876U (en) | A kind of round outside but spuare inside crack resistance | |
| CN110763583A (en) | Concrete strength detection method | |
| CN105738603A (en) | New test method for determining crack resistance of early-age concrete | |
| CN216434126U (en) | Restraint shrink testing arrangement | |
| CN109061118A (en) | A kind of test device of quick measurement concrete early-stage crack resistance | |
| Nguyen et al. | Assessment of early-age cracking of high-performance concrete in restrained ring specimens | |
| CN104374897A (en) | Method for determining early-stage concrete crack resistance by adopting elliptical ring test specimen | |
| CN108414732A (en) | A kind of round outside but spuare inside crack resistance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |