CN108535459A - A kind of crack resistance - Google Patents
A kind of crack resistance Download PDFInfo
- Publication number
- CN108535459A CN108535459A CN201810411953.5A CN201810411953A CN108535459A CN 108535459 A CN108535459 A CN 108535459A CN 201810411953 A CN201810411953 A CN 201810411953A CN 108535459 A CN108535459 A CN 108535459A
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- China
- Prior art keywords
- steel loop
- interior steel
- crack resistance
- periphery wall
- interior
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
Abstract
The invention discloses a kind of crack resistances, including cracking resistance device, several foil gauges connected with computer circuits, the annular exterior sheathing and interior steel loop that the cracking resistance device includes stepped bottom plate, is concentrically disposed at from outside to inside on the stepped bottom plate, the foil gauge is uniformly arranged in the circumferential direction on the interior steel loop internal perisporium, it is provided with induced cracking component on the interior steel loop periphery wall, it is characterised in that：The induced cracking component includes annular Ribbed Bar, several angle steel, and the angle steel is uniformly arranged in the circumferential direction the interior steel loop periphery wall, and the annular Ribbed Bar is fixed on interior steel loop periphery wall.The configuration of the present invention is simple, it is easy to operate, solve the problems, such as that the experimental period of existing annulus cracking resistance device generally existing is long, crack is not easy to observe.
Description
Technical field
The present invention relates to construction material performance test, more particularly to a kind of anti-cracking performance of cement base material quickly tests dress
It sets.
Background technology
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, cement mortar or concrete feature easy to crack in Practical Project also expose
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 taking precautions against and disposing
The problem of Cracking of building is of great significance.
Circularly restrained shrinkage anti-cracking method can by relatively broad be commented applied to the early anti-cracking behavior of cement-based material at present
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 of different temperatures damp condition maintenance 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 assay method are needed, it should meet, and detection device is simple, tests
Period is relatively short, crack is apparent, convenient for the requirements such as observation, the cracking resistance for detecting cement-based material, to realize work
Journey application.
Invention content
The purpose of the present invention is overcoming deficiency in the prior art, a kind of very fast measurement anti-cracking performance of cement base material is provided
Evaluating apparatus, can solve the problems, such as existing for existing evaluation method that the test period is long, crack should not be observed.
The present invention 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 at from outside to inside on the stepped bottom plate
Annular 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
Induced cracking component is provided on ring periphery wall, the induced cracking component includes annular Ribbed Bar, several angle steel, the angle
Steel is uniformly arranged in the circumferential direction the interior steel loop periphery wall, and 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
Experiment 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 outer ring template and interior steel loop.
Further, the annular exterior sheathing includes two semicircle plastic formworks, and it is right that two semicircle plastic formworks pass through
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, which is circumferentially respectively welded, is arranged at the quarterline of the interior steel loop periphery wall, 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 the leg of angle back of the body, convenient for the cracking resistance of observation concrete.
Further, the Ribbed Bar selects a diameter of 10-16mm, and enough inducing actions are provided 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 constraints.
Further, the interior steel loop internal diameter is 140-150mm, thickness 20-30mm, is highly 80-120mm.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 detect the mutation of strain 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 experiment material dosage while ensures 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 present invention by be arranged angle steel, Ribbed Bar component induce cement-based material cracking, overcome annulus experiment in by
Lead to the longer disadvantage of cracking time in constraint deficiency, increases annulus cracking sensitivity, substantially reduce experiment and carry out the time.
The foil gauge and COMPUTER DETECTION device of mating setting can monitor cement-based material in real time by the strain variation of inner ring and open
Deformation in splitting, Accurate Determining cracking time relatively accurately measure the cracking resistance of cement-based material.
Description of the drawings
Fig. 1 is inventive die overlooking structure diagram；
Fig. 2 is the A-A cross-sectional views of inventive die；
Fig. 3 a are the axial schematic diagrames of Ribbed Bar in induced cracking component；
Fig. 3 b are the schematic cross-sections 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 types bottom plate, 2- semicircles plastic formwork, 3- Ribbed Bars, steel loop, 5- strains in 4-
Piece, 6- angle steel, 7- are to connecting bolt.
Specific implementation mode
To keep the objectives, technical solutions, and advantages of the present invention clearer, specific implementation mode and correlation will be passed through below
Attached drawing, invention is further described in detail.
As shown in Fig. 1~2, 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 150mm, thickness 25mm, is highly 100mm, 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 in joint to connecting bolt 7, 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 bars of 12mm, and reinforcing bar is welded along 4 outer circumference face of interior steel loop, and is welded in 4 outside half of interior steel loop
At height and position；As shown in figure 4, it is L30 × 30 × 4,6 two edges of the angle steel that 6 steel of the angle steel, which select Q235 steel, specification,
It is welded in 4 periphery wall of interior steel loop, is axially welded to from the half height of interior steel loop 4 from top 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 4 internal perisporium quarterline of interior steel loop, and is respectively positioned on institute
The position of 4 short transverse half of interior steel loop is stated, for incuding 4 micro-strain of steel loop in record, by straining record reflection
The cracking time of confined concrete.
Using the anti-cracking performance of cement base material rapid assay methods of described device, including step：
The first step：After device is completed, machine oil is coated at the inner surface of annular exterior sheathing, to prevent itself and mortar or
Concrete binding；
Second step：Mortar or concrete are poured between annular exterior sheathing and interior steel loop 4, and outer shroud is removed after conserving for 24 hours
Shape exterior sheathing obtains cement-based material ring；
Second step：Using the upper surface of the waterproof material such as epoxy resin sealing cement-based material ring, and place it in
It is conserved in the environment that temperature is 20 ± 2 DEG C and humidity is 40%-70%；
Third walks：Strain in observational record on steel loop, if mutating indicates the mortar at the height or concrete
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 object, technical solutions and advantages of the present invention are further described in detail in present embodiment, should say
Bright, the foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all spirit in the present invention
Within principle, made by all any modification, equivalent and improvement etc., should be included within the scope of the present invention.
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 at from outside to inside on the stepped bottom plate
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
Induced cracking component is provided on periphery wall, it is characterised in that：The induced cracking component includes annular Ribbed Bar, several angles
Steel, the angle steel are uniformly arranged in the circumferential direction the interior steel loop periphery wall, and the annular Ribbed Bar is fixed on interior steel loop periphery wall.
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 outer ring template 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 and is arranged at the quarterline of the interior steel loop periphery wall, while axially two points are welded to 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
Muscle selects a diameter of 10-16mm.
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 140-150mm, thickness 20-30mm, is highly 80-120mm.
9. crack resistance according to claim 8, 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 |
|---|---|---|---|
| CN201810411953.5A CN108535459A (en) | 2018-05-03 | 2018-05-03 | A kind of crack resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810411953.5A CN108535459A (en) | 2018-05-03 | 2018-05-03 | A kind of crack resistance |
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| Publication Number | Publication Date |
|---|---|
| CN108535459A true CN108535459A (en) | 2018-09-14 |
Family
ID=63475990
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|---|---|---|---|
| CN201810411953.5A Pending CN108535459A (en) | 2018-05-03 | 2018-05-03 | A kind of crack resistance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109884287A (en) * | 2019-03-29 | 2019-06-14 | 福州大学 | A kind of crack-resistant performance of concrete device for quick testing and its working method |
| CN110208504A (en) * | 2019-05-31 | 2019-09-06 | 华南理工大学 | A kind of fiber concrete ring type constrained crack-ing device of chemistry optimization |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109884287A (en) * | 2019-03-29 | 2019-06-14 | 福州大学 | A kind of crack-resistant performance of concrete device for quick testing and its working method |
| CN110208504A (en) * | 2019-05-31 | 2019-09-06 | 华南理工大学 | A kind of fiber concrete ring type constrained crack-ing device of chemistry optimization |
| CN110208504B (en) * | 2019-05-31 | 2021-10-26 | 华南理工大学 | Fiber concrete annular restraint cracking device of chemistry optimization |
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