CN110441116A - A kind of fissure rock test concrete sample three-dimensional built-in crack manufacturing method - Google Patents
A kind of fissure rock test concrete sample three-dimensional built-in crack manufacturing method Download PDFInfo
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- CN110441116A CN110441116A CN201910870665.0A CN201910870665A CN110441116A CN 110441116 A CN110441116 A CN 110441116A CN 201910870665 A CN201910870665 A CN 201910870665A CN 110441116 A CN110441116 A CN 110441116A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/42—Low-temperature sample treatment, e.g. cryofixation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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Abstract
The invention discloses a kind of fissure rock test concrete sample three-dimensional built-in crack manufacturing methods, comprising the following steps: gets out material and tool needed for test；Corresponding hole is made on the two sides of mold according to the data parameters in designed reserved crack；The mold and thickness partial size sandstone, water and cement are put into cooling down in refrigerating box；Mixing concrete；Mold is taken out, concrete is added, hierarchical block is carried out to concrete and is vibrated；The hole of mold two sides is passed through using filament and ice cube is fixed on mould inside；Concrete sample is immediately placed in initial set in refrigerating box after the concrete vibrating on ice cube upper layer is closely knit；Preliminary test specimen is taken out from refrigerating box after concrete final set, and is statically placed in Interior Temperature Environment；Preliminary test specimen after standing is carried out demoulding and is immediately placed in standard curing room to conserve.The utility model has the advantages that can farthest test simulation rock, people is helped more in depth to understand the failure mechanism of rock.
Description
Technical field
The present invention relates to the studying technological domains to crack propagation law in rock, it particularly relates to a kind of crack rock
Stone test concrete sample three-dimensional built-in crack manufacturing method.
Background technique
Rock mass refers under the conditions of certain geology, contains such as crack, joint, stratification, the discontinuous structural plane group of tomography
At live rock, it is a complicated geologic body.The overwhelming majority of the earth's crust is all made of rock, and old friend's class lives in ground
On ball, many activities for producing, living all are closely bound up with rock.Such as exploit underground resources, build reservoir and
Dig tunnel and canal etc..However, with the development of production and the needs of life, the exploitation of subterranean resource is transferred to by superficial part
Deep rock stratum, the building on rock is also more and more taller and bigger, such as various types of high dams, powerhouse of hydropower station, nuclear power station.Cause
Occur more and more rock engineering problems in the production of people.
For example, 2 days December nineteen fifty-nine, French Ma Erpasai thin arch dam cause entire arch dam to be ruined due to dam foundation unstability,
Flood rolls downwards suddenly, causes heavy losses to downstream；On October 9th, 1963, Italian tile according to high reservoir rock slope due to
Limestone stratification remitted its fury and movement of coming down on a large scale occurs, a large amount of rock pours in reservoir, and moment causes up to count
Hundred meters of billow causes the cities and towns in downstream by destructive destruction；There are also the Austrian power stations Ge Erlisi, make
Cause lining cutting to rupture due to the surrounding rock failure of water delivery pressure tunnel with period, high pressure water pours Power Plant, make unit by
Very big loss, forces halt production to handle.These examples all show that the lesson caused due to the rock failure mechanism of rock is very painful, so
For numerous rockwork persons, study of rocks failure law is necessary.
Rock belongs to fragile material, therefore that brittleness can be shown under bearing load and certain condition is broken for most of solid rock
Bad property, that is to say, that there is no fairly obvious deformations just to destroy suddenly under load action for these rocks.And it generates
This destruction may be caused by crack of the type of load, the structure of material and inside etc., and wherein rock interior crack is in lotus
The lower extension of load effect is to lead to the most important reason of the rock failure mechanism of rock.Therefore, study of rocks internal crack propagation law is very must
It wants.
However most of research workers remain in the propagation law research in two-dimentional crack, though it achieves quite abundant
Research achievement, but the propagation law in test specimen two dimension crack is used and is obviously less applicable in rock three-dimensional fracture, or even meeting
Generate completely different result.Also a few peoples carry out the research in three-dimensional built-in crack, but what is used is all analogous to brittleness
The transparent materials such as resin, although can be with the expansion process in crack visible in detail, its mechanical property and true rock gap
It is larger, mainly due in terms of following two: firstly, most of transparent materials are all plastic materials, still having at low temperature
Plastic behavior, particularly with the region that crack point stresses are concentrated, the influence of plastic deformation is all very important.But rock is
Brittle, when destruction, is broken suddenly, therefore there is a certain error with the true rock of these material simulations.Secondly, true
Rock is heterogeneous material, all shown on the showing and propagate of various physical and mechanical effects complicated noncontinuity,
Heterogeneity, anisotropy, therefore its influence of internal crack to mechanical characteristic is especially big, and homogeneous material has ignored this
Point is inaccurate to the inside reflection of practical rock.
Instantly, one important of ground worker is had become to the research of rock three-dimensional built-in crack propagation mechanism
Business, can not only let us better understand the failure mode of rock, moreover it is possible to shift to an earlier date us to various geotechnical engineering accidents
Make the precautionary measures.Because rock is brittleness, heterogeneous, internal the defects of there are countless holes, crack, joints, so
It is difficult to summarize crack propagation rule and its influence to material mechanical performance using true rock.In addition true rock also can not be pre-
Set certain size, position, direction, quantity buried crack, therefore can not study built-in crack extension Evolution, at present use
The test of true rock material is also limited to study external crack situation mostly.And concrete structure is also as rock, be brittleness,
It is heterogeneous, it is primary raw material by selecting cement, standard sand, through certain technological means machine-shaping after mixing, after molding
Concrete sample main physico-mechanical parameter (such as elasticity modulus, Poisson's ratio, compression strength, tensile strength, bulk density) with
True rock is close, and carrying out test can show and stress deformation feature as rock type.And the concrete material prepared
Workability it is preferable, make molding convenient for test specimen and be also easier in the embedded three-dimensional fracture in inside and demoulding, thus by
Three-dimensional fracture is manufactured in concrete sample to carry out crack propagation law study.
For the problems in the relevant technologies, currently no effective solution has been proposed.
Summary of the invention
For the problems in the relevant technologies, the present invention proposes that a kind of fissure rock test is split with concrete sample three-dimensional built-in
Gap manufacturing method can be tested effective for simulation rock, preferably explain the Mechanics Phenomenon of labyrinth and its sheet in rock
Structure relationship, to overcome above-mentioned technical problem present in existing the relevant technologies.
For this purpose, the specific technical solution that the present invention uses is as follows:
A kind of fissure rock test concrete sample three-dimensional built-in crack manufacturing method, comprising the following steps:
Be prepared in advance test needed for concrete mold, ice cube, thickness partial size sandstone, water, cement, concrete admixture,
Release agent, filament, film, refrigerating box and standard curing room；
Corresponding hole is made on the two sides of the concrete mold according to the data parameters in pre-designed reserved crack
Hole；
The concrete mold and the thickness partial size sandstone, the water and the cement are put into the refrigerating box and are cooled down
Cooling is spare；
The thickness partial size sandstone after cooling, the water are taken out from the refrigerating box with the cement and mixed by ratio of mud example
Concrete processed, and additional proportion is the concrete admixture of 6-9% in mixing；
The concrete mold is taken out while ready-mixed concrete, and the demoulding is uniformly smeared inside the concrete mold
Agent is added the good concrete of mixing, and carries out hierarchical block to concrete and vibrate；
The described hole of the concrete mold two sides is passed through using the filament and the ice cube is fixed on the coagulation
Native mould inside forms concrete sample；
The concrete sample is immediately placed in initial set in the refrigerating box after the concrete vibrating on ice cube upper layer is closely knit, and is adopted
The concrete surface is covered with film, forms preliminary test specimen；
Test specimen preliminary in the refrigerating box is taken out after concrete final set, and the preliminary test specimen is placed on Indoor Temperature
It spends and stands number in environment；
The preliminary test specimen after standing is carried out demoulding and be immediately placed in the standard curing room to conserve, can be obtained
Concrete sample with crack.
Further, the data parameters include location parameter, angle parameter, dimensional parameters, the number in the reserved crack
Mesh parameter and spacing parameter.
Further, the concrete admixture is accelerator.
Further, the crack is made of ice cube.
Further, it is put by the concrete mold and the thickness partial size sandstone, the water and the cement
In the refrigerating box in cooling down standby step:
Temperature in the refrigerating box is 6-10 DEG C, and cooling time is more than or equal to 30 minutes.
Further, the concrete mold is immediately placed in after the concrete vibrating on ice cube upper layer is closely knit it is described cold
Initial set in case is hidden, and is covered in the concrete mold surface step using film:
Temperature in the refrigerating box is 6-10 DEG C.
Further, test specimen preliminary in the refrigerating box is being taken out after concrete final set, and will be described preliminary
Test specimen is placed in Interior Temperature Environment and stands in numbering step:
Being placed on time of repose in Interior Temperature Environment is 12-18 hours.
Further, the preliminary test specimen after standing is carried out demoulding and is immediately placed in the standard curing room to carry out
In curing step:
Curing time is 21-28 days.
The invention has the benefit that the present invention using it is hard, facilitate it is prefabricated and with regular shape ice cube, be put into
Inside concrete, and melt during concrete curing, melt moisture evaporation or flowed out from hole, thus in coagulation
The native internal crack for leaving regular shape.And the position of hole on mold two sides can also be designed, hole is passed through with filament
Ice cube is fixed, and adjusts position, the angle, spacing, quantity in crack with this, the concrete sample with such crack has had band
The property of fissure rock can be tested farthest simulation rock, people is helped more in depth to understand the failure mechanism of rock.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of fissure rock test concrete sample three-dimensional built-in crack manufacturer according to an embodiment of the present invention
The flow chart of method.
Fig. 2 is Single Fracture test specimen schematic diagram.
Fig. 3 is Single Fracture manufacturing method schematic diagram.
Fig. 4 is parallel double cracks test specimen schematic diagram.
Fig. 5 is coplanar double crack test specimen schematic diagrames.
Fig. 6 is the manufacturing method schematic diagram of coplanar double crack test specimens.
Fig. 7 is double cracks test specimen schematic diagram that misplaces.
Fig. 8 is three crack test specimen schematic diagrames.
In figure: 1, crack；2, ice cube；3, filament；4, hole and bolt；5, concrete mold.
Specific embodiment
To further illustrate that each embodiment, the present invention are provided with attached drawing, these attached drawings are that the invention discloses one of content
Point, mainly to illustrate embodiment, and the associated description of specification can be cooperated to explain the operation principles of embodiment, cooperation ginseng
Examine these contents, those of ordinary skill in the art will be understood that other possible embodiments and advantages of the present invention, in figure
Component be not necessarily to scale, and similar component symbol is conventionally used to indicate similar component.
It is manufactured according to an embodiment of the invention, providing a kind of fissure rock test with concrete sample three-dimensional built-in crack
Method.
Now in conjunction with the drawings and specific embodiments, the present invention is further described, as shown in Figure 1, according to embodiments of the present invention
Fissure rock test use concrete sample three-dimensional built-in crack manufacturing method, comprising the following steps:
Step S101, be prepared in advance concrete mold, ice cube, thickness partial size sandstone, water, cement, coagulation needed for test
Native additive, release agent, filament, film, refrigerating box and standard curing room；
Step S102 makes on the two sides of the concrete mold according to the data parameters in pre-designed reserved crack
Corresponding hole；
Specifically, above-mentioned data parameters include the location parameter, angle parameter, dimensional parameters, number of parameters in the reserved crack
And spacing parameter.
The concrete mold and the thickness partial size sandstone, the water and the cement are put into institute by step S103
It is spare to state cooling down in refrigerating box；
Specifically, the temperature in above-mentioned refrigerating box is 6-10 DEG C, cooling time is more than or equal to 30 minutes, to make to stir coagulation
The heat of hydration generated when native minimizes.
Step S104 takes the thickness partial size sandstone after cooling, the water with the cement from the refrigerating box
Ratio of mud example mixing concrete is pressed out, and additional proportion is the concrete admixture of 6-9% in mixing；
Specifically, above-mentioned concrete admixture be accelerator, thus make concrete vibrate complete after rapidly condensation hardening (on
Stating accelerator includes that alkali-free liquid setting accelerator and liquid have alkali accelerator, is glue when above-mentioned accelerator is alkali-free liquid setting accelerator
The 6-9% of gel material, when above-mentioned accelerator is when liquid has alkali accelerator be cementitious material 3-5%)；Above-mentioned ratio of mud example is
0.4。
Step S105 takes out the concrete mold while ready-mixed concrete, inside the concrete mold
It is even to smear the release agent, the good concrete of mixing is added, and hierarchical block is carried out to concrete and is vibrated；
Step S106 passes through the described hole of the concrete mold two sides using the filament and is fixed on the ice cube
Inside the concrete mold, concrete sample is formed；
The concrete sample is immediately placed in the refrigerating box by step S107 after the concrete vibrating on ice cube upper layer is closely knit
Initial set, and the concrete surface is covered using film, form preliminary test specimen；
Specifically, the temperature in above-mentioned refrigerating box is 6-10 DEG C.
Step S108, by test specimen preliminary in refrigerating box taking-up after the concrete final set, and by the preliminary examination
Part, which is placed in Interior Temperature Environment, stands number；
Specifically, being placed on time of repose in Interior Temperature Environment is 12-18 hours.
Step S109 carries out demoulding and is immediately placed in the standard curing room to carry out to the preliminary test specimen after standing
Maintenance, can be obtained the concrete sample with crack.
Specifically, above-mentioned crack is made of ice cube, curing time is 21-28 days.
Above-mentioned technical proposal of the invention is understood in order to clearer, below by way of specific example to above-mentioned side of the invention
Case is described in detail.
Embodiment one: the manufacture of Single Fracture test specimen
As shown in Fig. 2, test specimen is length and width, thickness is 50mm × 50mm × 50mm square respectively, crack is Single Fracture test specimen
The cube of sheet, length and width, thickness are 10mm × 10mm × 3mm respectively, and positioned at test specimen center, the angle of crack and horizontal plane is
45 degree.
The manufacturing process in crack is as shown in Figure 3, the specific steps are as follows: gets out concrete mold needed for test in advance
5, ice cube 2, filament 3, thickness partial size sandstone 800g, water 125g(do not include the water in liquid accelerator), cement 350g, concrete
60%) and dry substance (release agent and film) and tool (refrigerating box and mark if water content is in accelerator 20g(liquid accelerator
Quasi- fog room).Angle according to the reserved crack of design and horizontal plane is 45 degree, in the top corner angle of mold two sides and lower part
Corresponding hole and matched bolt 4 are made on corner angle, while to minimize the heat of hydration generated when ready-mixed concrete, first
Mold, thickness partial size sandstone, water, cement are put into togerther in refrigerating box and are cooled to 6 DEG C -10 DEG C at least 30 minutes or more, by water
0.4 mixing concrete of gray scale, and accelerator is added in mixing, it is therefore an objective to making concrete, condensation is hard rapidly after completion of vibrating
Change, and take out mold while ready-mixed concrete, smears release agent in mould inside, the good concrete of mixing is added, by rule
Model requires to vibrate to concrete progress hierarchical block, while ice cube is fixed on mold with the hole that filament passes through mold two sides
Inside, to prevent mould inside ice melting too fast, be immediately placed in after ice cube upper layer concrete vibrating is closely knit temperature be 6 DEG C-
It is pre-hardening in 10 DEG C of refrigerating box, surface is covered with fluid-tight film, keeps the humidity of concrete, after concrete final set
Test specimen is taken out, stands 12-18 hours in temperature environment indoors, is immediately placed in standard curing room and conserves after demoulding label
21-28 days, the concrete sample with crack can be obtained.Since temperature in the process increases so that inside concrete is ice melting,
Thawing water is absorbed or evaporated and flow out in the hole of concrete sample by concrete, to split in inside concrete formation
Gap.
Embodiment two: the manufacture of parallel double cracks test specimen
Parallel double crack test specimens are as shown in figure 4, two sheet cube cracks are located at the center of test specimen, spacing 10mm.It is all
The angle of crack and horizontal plane is all 30 degree.
Crack manufacture specific step is as follows: be ready in advance test needed for concrete mold 5, ice cube 2, filament 3,
Thickness partial size sandstone 800g, water 125g(do not include the water in liquid accelerator), cement 350g, concrete accelerator 20g(liquid
60%) and dry substance (release agent and film) and tool (refrigerating box and standard curing room) if water content is in accelerator.According to
Designed reserved crack will be 30 degree with the angle of horizontal plane, and corresponding hole and matched spiral shell are made on mold two sides
Bolt 4, the heat of hydration generated when to make ready-mixed concrete minimize, and first mold, thickness partial size sandstone, water, cement are put together
Enter to be cooled to 6 DEG C -10 DEG C in refrigerating box at least 30 minutes or more, by 0.4 mixing concrete of the ratio of mud, and speed is added in mixing
Solidifying agent, it is therefore an objective to make concrete condensation hardening rapidly after completion of vibrating, and take out mold, In while ready-mixed concrete
Mould inside smears release agent, and the good concrete of mixing is added, and carries out layering to concrete by code requirement and vibrates, is worn with filament
The ice cube of first layer is fixed on mould inside by the hole crossed on mold two sides, and concrete is then added to second layer ice cube position
Place and vibration compacting, then the ice cube of the fixed second layer are set, to prevent mould inside ice melting too fast, after vibration compacting immediately
It is put into initial set in the refrigerating box that temperature is 6 DEG C -10 DEG C, surface is covered with fluid-tight film, keeps the humidity of concrete, wait until
Test specimen is taken out after concrete final set, stands 12-18 hours in temperature environment indoors, is immediately placed in standard after demoulding label
It is conserved 21-28 days in fog room, the concrete sample with crack can be obtained.
Embodiment three: the manufacture of coplanar double crack test specimens
Coplanar double crack test specimens are as shown in figure 5, two sheet cube cracks are located at the center two sides of test specimen.All cracks and water
The angle of plane is all 30 degree, and in the same plane.
The manufacturing process in crack is as shown in Figure 6, the specific steps are as follows: gets out concrete mold needed for test in advance
5, ice cube 2, filament 3, thickness partial size sandstone 800g, water 125g(do not include the water in liquid accelerator), cement 350g, concrete
If in accelerator 20g(liquid accelerator water content be 60%) and dry substance (release agent and film) and tool (refrigerating box and
Standard curing room).To be 30 degree with the angle of horizontal plane according to designed reserved crack, be made on mold two sides corresponding
Hole and matched bolt 4, the heat of hydration generated when to make ready-mixed concrete minimizes, first mold, thickness partial size sand
Stone, water, cement, which are put into togerther in refrigerating box, is cooled to 6 DEG C -10 DEG C at least 30 minutes or more, by 0.4 mixing concrete of the ratio of mud,
And accelerator is added in mixing, it is therefore an objective to make concrete condensation hardening rapidly after completion of vibrating, and in ready-mixed concrete
While take out mold, smear release agent in mould inside, the good concrete of mixing be added, layering is carried out to concrete and is vibrated,
The hole on mold two sides being passed through with filament, the ice cube of first layer being fixed on mould inside, concrete is then added to second
Simultaneously vibration compacting, then the ice cube of the fixed second layer, close wait vibrate to prevent mould inside ice melting too fast at layer ice cube position
It is immediately placed in initial set in the refrigerating box that temperature is 6 DEG C -10 DEG C after reality, covers surface with fluid-tight film, keeps concrete
Test specimen is taken out after concrete final set, stands 12-18 hours in temperature environment indoors by humidity, is stood after demoulding label
It is put into standard curing room and conserves 21-28 days, the concrete sample with crack can be obtained.
Example IV: the manufacture for double cracks test specimen that misplaces
Double crack test specimens misplace as shown in fig. 7, two sheet cube cracks are located at the center two sides of test specimen, splitting sharp spacing is
10mm splits point by center, and the angle of two cracks and horizontal plane is all 45 degree, but not in the same plane.
The manufacturing process in crack is identical as the manufacturing process in coplanar double cracks described in embodiment three, and only ice cube is placed
Position and angle difference.
The manufacture of five: three crack test specimen of embodiment
Three crack test specimens are as shown in figure 8, three sheet cube cracks are located at the center of test specimen, spacing 10mm, all cracks
Angle with horizontal plane is all identical 30 degree.
The manufacturing process in its crack is identical as the manufacturing process in parallel double cracks described in embodiment two, and three cracks are under
And Shangdi successively manufactures by the same way.
In conclusion by means of above-mentioned technical proposal of the invention, the present invention using it is hard, facilitate prefabricated and there are rule
The then ice cube of shape is put into inside concrete, and melts during concrete curing, melts moisture evaporation or from hole
Middle outflow, to leave the crack of regular shape in inside concrete.And the position of hole on mold two sides can also be designed
It sets, passes through hole with filament and fix ice cube, and adjust position, the angle, spacing, quantity in crack with this, with such crack
Concrete sample has had the property with fissure rock, can farthest test simulation rock, help people more in depth
Understand the failure mechanism of rock.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of fissure rock test concrete sample three-dimensional built-in crack manufacturing method, which is characterized in that including following step
It is rapid:
Be prepared in advance test needed for concrete mold, ice cube, thickness partial size sandstone, water, cement, concrete admixture,
Release agent, filament, film, refrigerating box and standard curing room；
Corresponding hole is made on the two sides of the concrete mold according to the data parameters in pre-designed reserved crack
Hole；
The concrete mold and the thickness partial size sandstone, the water and the cement are put into the refrigerating box and are cooled down
Cooling is spare；
The thickness partial size sandstone after cooling, the water are taken out from the refrigerating box with the cement and mixed by ratio of mud example
Concrete processed, and additional proportion is the concrete admixture of 6-9% in mixing；
The concrete mold is taken out while ready-mixed concrete, and the demoulding is uniformly smeared inside the concrete mold
Agent is added the good concrete of mixing, and carries out hierarchical block to concrete and vibrate；
The described hole of the concrete mold two sides is passed through using the filament and the ice cube is fixed on the coagulation
Native mould inside forms concrete sample；
The concrete sample is immediately placed in initial set in the refrigerating box after the concrete vibrating on ice cube upper layer is closely knit, and is adopted
The concrete surface is covered with film, forms preliminary test specimen；
Test specimen preliminary in the refrigerating box is taken out after concrete final set, and the preliminary test specimen is placed on Indoor Temperature
It spends and stands number in environment；
The preliminary test specimen after standing is carried out demoulding and be immediately placed in the standard curing room to conserve, can be obtained
Concrete sample with crack.
2. fissure rock test concrete sample three-dimensional built-in crack manufacturing method according to claim 1, feature
It is, the data parameters include location parameter, angle parameter, dimensional parameters, number of parameters and the spacing in the reserved crack
Parameter.
3. fissure rock test concrete sample three-dimensional built-in crack manufacturing method according to claim 1, feature
It is, the concrete admixture is accelerator.
4. fissure rock test concrete sample three-dimensional built-in crack manufacturing method according to claim 1, feature
It is, the crack is made of ice cube.
5. fissure rock test concrete sample three-dimensional built-in crack manufacturing method according to claim 1, feature
It is, is put into the refrigerating box by the concrete mold and the thickness partial size sandstone, the water and the cement
In cooling down standby step:
Temperature in refrigerating box is 6-10 DEG C, and cooling time is more than or equal to 30 minutes.
6. fissure rock test concrete sample three-dimensional built-in crack manufacturing method according to claim 1, feature
It is, it is pre-hardening the concrete mold is immediately placed in the refrigerating box after the concrete vibrating on ice cube upper layer is closely knit,
And it is covered in the concrete mold surface step using film:
Temperature in refrigerating box is 6-10 DEG C.
7. fissure rock test concrete sample three-dimensional built-in crack manufacturing method according to claim 1, feature
It is, is taking out test specimen preliminary in the refrigerating box after concrete final set, and the preliminary test specimen is placed on room
It is stood in numbering step in interior temperature environment:
Being placed on time of repose in Interior Temperature Environment is 12-18 hours.
8. fissure rock test concrete sample three-dimensional built-in crack manufacturing method according to claim 1, feature
It is, the preliminary test specimen after standing is carried out demoulding and be immediately placed in the standard curing room to carry out in curing step:
Curing time is 21-28 days.
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| CN110967237A (en) * | 2019-12-24 | 2020-04-07 | 贵州大学 | Concrete test piece with three-dimensional built-in cracks and manufacturing method thereof |
| CN111089772A (en) * | 2020-02-05 | 2020-05-01 | 山东科技大学 | Method for preparing rock test piece containing non-filling type internal defects |
| CN112146960A (en) * | 2020-10-14 | 2020-12-29 | 中国矿业大学(北京) | Method for manufacturing cement mortar test piece with built-in open crack |
| CN113295484A (en) * | 2021-04-21 | 2021-08-24 | 重庆交通大学 | Method for manufacturing concrete test piece for simulating water-containing cavity defect |
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