CN107561251A - A kind of cement-based material cracking sensitivity test device and method of testing - Google Patents
A kind of cement-based material cracking sensitivity test device and method of testing Download PDFInfo
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- CN107561251A CN107561251A CN201710865118.4A CN201710865118A CN107561251A CN 107561251 A CN107561251 A CN 107561251A CN 201710865118 A CN201710865118 A CN 201710865118A CN 107561251 A CN107561251 A CN 107561251A
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Abstract
The present invention is a kind of test device and method of cement-based material cracking sensitivity, and volume stability and durability influence of the cracking sensitivity on cement-based material is very big, structural bearing and security is also adversely affected, and then cause cement-based material accelerated deterioration.The present invention have developed a kind of detection means and method, and the round outside but spuare inside copper coin shape test device of design and use carries out the test of cement-based material cracking sensitivity.The application method of this test device comprises the following steps：（1）Pouring molding；（2）Measure and record；（3）Evaluation.Feature is that assay method operation is rapid simple, sensitive, strong applicability, is worthy to be popularized.
Description
Technical field
The invention belongs to cement-based material applied technical field, and in particular to a kind of cement-based material（Including cement paste,
Mortar, concrete）Cracking sensitivity test device and method.
Background technology
The cement-based material such as mortar and concrete is construction material the most frequently used in architectural engineering, and its superior function obtains industry
The accreditation of interior personage.As the quickening of Urbanization in China is, it is necessary to consume the construction materials such as substantial amounts of mortar and concrete, and
These construction materials must face severe problem of Cracking again while large-scale use.Cracking not only influences the outer of building
See, the durability of structure can be more influenceed when serious, the costly man power and material of the maintenance to cracking performance every year.Therefore,
The cracking of slurry net to binder materials, mortar and concrete is needed to study.The factor for influenceing cracking has a lot, the property of material
Matter, construction quality, maintenance measure, humiture etc., it can all influence to ftracture, wherein plastic shrinkage, drying shrinkage, autogenous shrinkage and temperature temperature
It is the principal element for influenceing cracking to rise.
The cracking performance of on sound lines simple, quick detection and evaluation cement paste, mortar and concrete, to taking precautions against
It is significant with disposal problem of Cracking.The method of test cracking performance mainly has flat board cracking method, ring to open both at home and abroad at present
Method and single shaft method etc. are split, but these methods have certain limitation, be mainly manifested in and be difficult to ftracture, the unobvious that ftracture, open
The cycle is long, crack location is uncertain and has cracking is split since inside starts the deficiencies of so that existing method of testing is more difficult accurately,
The cracking sensitivity of quick detection cement-based material, it is poor for applicability.Therefore, it is necessary to study it is a kind of it is new can simply, quickly
Test the detection means of cement-based material cracking sensitivity.
The content of the invention
In order to solve the above problems, it is an object of the invention to provide one kind to solve existing cement-based material cracking sensitivity
The problems such as test is not easy to crack, test period is long, realize simple, quick test binder materials starches only, mortar and concrete
The test device of cracking susceptible performance.
Apparatus of the present invention are round outside but spuare inside copper coin shape, and internal square edge is advantageous to strengthen constraint, produces stress collection
The middle cracking process for accelerating cement-based material, it can effectively make up not sensitive enough the deficiency of traditional crack resistance method of testing.
It is as follows that method of testing specifically includes step：
（1）Pouring molding：Corresponding net slurry, mortar or concrete are prepared according to the match ratio of required cement-based material, and is poured
Build in test device of the present invention；
（2）Detection：The timing since being cast in testing mould, surface of test piece is observed every 2 h, form removal in 24 hours,
Initial cracking time is recorded, after Initial Cracking, crack number, fracture width when measuring respectively and counting 3 d, 7 d, 14d；Foundation
Initial cracking time and regulation age crack number, fracture width carry out overall merit to the cracking sensitivity of cement-based material,
Testing standard environment and shrink, creep it is identical.
Cracking sensitivity test device of the present invention is as shown in drawings, it is characterised in that the test device is in periphery
The combined shaped of square column among annulus, as shown in Figure 1.The test device include semicircle hoop, be detachably fixed bolt, etc. the length of side
Square column and disc base；
Wherein, the semicircle hoop is arranged on the outside of the disc base, and the equilateral long square column is arranged on the disk bottom
The center of seat, the semicircle hoop are machined with bolt hole and grip hand handle, and two semicircle hoops can be by described detachable
Fixing bolt tight closure forms complete circle hoop, and the equilateral long square column is used with the disc base and is welded and fixed, described
Semicircle hoop can be brought into close contact with the disc base surface, ensure no spillage.
Test device is according to cement-based material species（Net slurry, mortar, concrete）There are three kinds of size ranges, i.e. test gelling
Material is starched only, the plant bulk of the cracking sensitivity of mortar and concrete.
The features of the present invention and beneficial effect are：It is quick mainly for the cement-based material cracking such as net slurry, mortar or concrete
Perception test and evaluation, the cement-based material to produce qualified provide technical basis.It is intended to emphasize for cement-based material,
Cracking sensitivity is an important technical requirements, and cracking sensitivity influences very big, sand to the durability of mortar, concrete etc.
After the test specimens such as slurry, concrete cracking, structure LADA reduces, the hazardous medium such as water and chlorion, carbon dioxide, sulfate
Enter matrix easily by crack and accelerate test specimen deterioration process.Increase with crack and broaden, structural bearing capacity can also be produced not
Profit influences.The present invention operates simple, rapid, sensitivity to the cracking sensitivity assay method of cement-based material, strong applicability, is worth
Promote.
Brief description of the drawings
Fig. 1 is a kind of structural representation of cement-based material cracking sensitivity test device of the present invention.
Fig. 2 is a kind of structural representation of another embodiment of cement-based material cracking sensitivity test device of the present invention.
In figure：
1. semicircle hoop, 2. are detachably fixed bolt, 3, equilateral long square column, 4. disc bases, 5. gripping hand handles, 6. bases, 7.
Support, 8. image collecting devices, 9. data handling systems, 10. heaters, 11. cooling devices, 12. clients.
Embodiment
Technical scheme is described further with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of cement-based material cracking sensitivity test device of the present invention, the test device include 2 half
Annulus hoop 1, it is detachably fixed bolt 2, equilateral long square column 3 and disc base 4；
Wherein, 2 semicircle hoops 1 are symmetrically mounted on the position at the close edge of the disc base 4,2 semicircles
Hoop 1 forms complete circle hoop by the interconnection of bolt 2 closure that is detachably fixed, and the equilateral long square column 3 is fixed on
The disc base 4 it is upper, and positioned at the center of the annulus hoop, the height of the equilateral long square column 3 is more than or equal to
The height of the semicircle hoop 1.The test device also includes gripping hand handle 5,2 hand handle 5 that grips and is fixed on the disk
The both sides of base 4.
As shown in Fig. 2 the test device also includes base 6, support 7, image collecting device（8）With data handling system 9,
Described image harvester 8 is arranged on the vertical direction of the base 6 by support 7, and the disc base 4 is placed in the base
On 6, the data handling system 9 is connected with the data of described image harvester 8, and the heater 10 is arranged on the base
Inside 6, the heater 10 connects with the data handling system 9 control.The cooling device 11 is arranged on the base 6
Inside, the control of the cooling device 11 and the data handling system 9 connects, the diagonal line length and 2 of the equilateral long square column
The individual semicircular ring hoop is into the interior diameter proportion of complete circle hoop：0.50-0.65.
Using device to test cement-based material cracking sensitivity method of testing as shown in Figure 1, comprise the following steps that：
Assembling device：First test device is assembled, first releasing agent is coated on the outside of square cylinder and on the inside of annulus, is placed in flat
Keep level on platform, it is standby；
Pouring molding：The match ratio for the cement-based material tested as required prepares corresponding net slurry, mortar or concrete, and
It is cast in the test device that step 1 assembles, vibration compacting is simultaneously floating by upper surface；
Detection：It it is 20 ± 2 DEG C in temperature, humidity starts timing in the environment of being 60 ± 5 DEG C, and surface of test piece is carried out every 2 h
Observation, opened after 24 hours and be detachably fixed bolt 2,2 semicircle hoops 1 removed, the cement matrix on recording disc base 4
Initial cracking time and crack number, after Initial Cracking, and primary part observation whether have on square cylinder periphery crackle produce and
Extension, crack number, fracture width when measuring and count respectively 3 d of shaping, 7 d, 14d；According to initial cracking time and regulation
The crack number of age, fracture width are evaluated the cracking sensitivity of cement-based material.
Using device to test cement-based material cracking sensitivity method of testing as shown in Figure 2, comprise the following steps that：
Assembling device：First test device is assembled, first releasing agent is coated on the outside of square cylinder and on the inside of annulus, is placed in flat
Keep level on platform, it is standby；
Pouring molding：The match ratio for the cement-based material tested as required prepares corresponding net slurry, mortar or concrete, and
It is cast in the test device that step 1 assembles；
Detection：It it is 20 ± 2 DEG C in temperature, humidity starts timing in the environment of being 60 ± 5 DEG C, and surface of test piece is carried out every 2 h
Observation, opened after 24 hours and be detachably fixed bolt 2,2 semicircle hoops 1 are removed, start image collecting device 8, heating dress
Put 10 and cooling device 11, record initial cracking time at different temperatures, after Initial Cracking, measure and count respectively shaping 3
D, crack number, fracture width when 7 d, 14d, and the data of record are sent to data handling system 9 and handled；At data
Reason system 9 is according to the crack number of initial cracking time under different temperatures and regulation age, fracture width to cement-based material
Cracking sensitivity is evaluated, and analysis result is sent into client by wired or wireless.
Embodiment 1：
Binder materials uses ordinary cement, test is molded using the cement paste of water-cement ratio 0.45, then by the uniform water of mix
Cement paste, which is poured into, to be poured, and vibratory compaction is simultaneously floating by upper surface, and outer layer annulus is removed after standing 24h, is placed on temperature as 20 ± 2
DEG C, in the environment of humidity is 60 ± 5 DEG C, the timing since being cast in testing mould, surface of test piece is seen every 2 h
Examine, recorded initial cracking time is 40h, there is the generation of two cracks in square cylinder corner.After Initial Cracking, respectively measurement and
Crack number, fracture width when 3 d of statistics shaping, 7 d, 14 d.Crack number is 6 when being wherein molded 7d, major fracture width
For 1.4mm.
Embodiment 2：
Included by percentage to the quality using the composition of low-carbon binder materials：24% clinker, 44% S105 slag powders, 22%
Flyash, 10% gypsum, 0.15% water reducer.Each cement components separate grinding remixes uniformly to corresponding fineness.Its reclaimed water
Mud clinker specific surface area is 320 m2/ kg, slag powders specific surface area are 530 m2/ kg, 28 d activity indexs are 108%, flyash
Water demand ratio is 90%, and fineness is 45 μm and tails over 11%, specific surface area 470m2/kg.It is molded and is surveyed using the net slurry of water-cement ratio 0.45
Examination, then the uniform cement paste of mix is poured into pour, and vibratory compaction is simultaneously floating by upper surface, and outer layer is removed after standing 24h
Annulus, temperature is placed on as 20 ± 2 DEG C, in the environment of humidity is 60 ± 5 DEG C, the timing since being cast in testing mould, every 2
H is observed surface of test piece, and recorded initial cracking time is 60h, there is crack generation in square cylinder corner.Initially
After cracking, crack number, fracture width when measuring and count respectively 3 d, 7d, 14d of shaping.Crack number when being wherein molded 7d
For 2, major fracture width is 0.6mm.Can be quick to the cracking starched only according to initial cracking time, crack number, fracture width
Whether perception meets that requirement of engineering is evaluated.Compared with the concrete paste specimen of embodiment 1, the low-carbon gelling material of embodiment 2
The cracking sensitivity of material be improved significantly, initial cracking time postpone, cracking number reduce, fracture width reduce.
Embodiment 3：
The composition of concrete in terms of quality used in every side's concrete including：980 kg/m3Coarse aggregate, 870 kg/m3Fine aggregate,
370 kg/m3Binder materials, 166 kg/m3Running water, water-cement ratio 0.45.The kg/m of ordinary cement 2203, the kg/ of flyash 70
m3, the kg/m of S95 slag powders 803It is well mixed with coarse-fine aggregate, obtains mixture；Running water is added into mixture, with stirring
Machine, which stirs 2 minutes, makes its uniform.Then the uniform concrete of mix is poured into concrete cracking sensitivity of the present invention to test
Device is poured, and vibration compacting is simultaneously floating by upper surface, and outer layer annulus is removed after standing 24h, and it is 20 ± 2 DEG C to be placed on temperature, humidity
In the environment of 60 ± 5 DEG C, the timing since being cast in testing mould, surface of test piece is observed every 2 h, recorded
Initial cracking time is 48h, there is crack generation in square cylinder corner.After Initial Cracking, shaping 3 is measured and counted respectively
D, crack number, fracture width when 7 d, 14 d.Crack number is 4 when being wherein molded 7d, and major fracture width is 1.2mm.According to
Whether can meet that requirement of engineering is carried out to the cracking sensitivity of concrete according to initial cracking time, crack number, fracture width
Evaluation.
Embodiment 4：
The composition of concrete in terms of quality used in every side's concrete including：980 kg/m3Coarse aggregate, 870 kg/m3Coarse aggregate,
370 kg/m3Binder materials, 160 kg/m3Running water, water-cement ratio 0.43.By the low-carbon binder materials and thickness in embodiment 2
Aggregate is well mixed, and obtains mixture；Running water is added into mixture, being stirred 2 minutes with mixer makes its uniform.Then will
The uniform concrete of mix pours into concrete cracking sensitivity test device of the present invention and poured, vibration compacting and by upper surface
It is floating, outer layer annulus is removed after standing 24h, temperature is placed on as 20 ± 2 DEG C, in the environment of humidity is 60 ± 5 DEG C, is surveyed from being cast in
Start timing in test die, surface of test piece is observed every 2 h, recorded initial cracking time is 58h, in square cylinder
There is crack generation in corner.After Initial Cracking, crack number, crack are wide when measuring and count respectively 3 d of shaping, 7 d, 14d
Degree.Crack number is 2 when being wherein molded 7d, and major fracture width is 0.5mm.According to initial cracking time, crack number, split
Whether slit width degree can meet that requirement of engineering is evaluated to the cracking sensitivity of concrete.With the concrete sample of embodiment 3
Compare, the cracking sensitivity of the low-carbon concrete of embodiment 4 be improved significantly, initial cracking time is postponed, and cracking number subtracts
Few, fracture width reduces.
The measure of cracking sensitivity is simply rapid, can greatly improve efficiency compared with annulus ftractures method, save the time.Can be with
Crack resistance contrast test is carried out, experience can also be obtained in lot of experiments and engineer applied contrast test, accumulates data, for the present
Lay the foundation, create conditions using this apparatus and method in codes and standards afterwards.
Above content is to combine specific embodiment further description made for the present invention, it is impossible to assert this hair
Bright specific implementation is to being confined to these explanations.For general technical staff of the technical field of the invention, do not taking off
On the premise of from present inventive concept, some simple deduction or replace can also be made, should all be considered as protection scope of the present invention.
Claims (8)
1. a kind of cement-based material cracking sensitivity test device, it is characterised in that the test device includes 2 semicircle hoops
（1）, it is detachably fixed bolt（2）, equilateral long square column（3）And disc base（4）；
Wherein, 2 semicircle hoops（1）It is symmetrically mounted on the disc base（4）Close edge position, described in 2
Semicircle hoop（1）Bolt is detachably fixed by described（2）It is connected with each other closure and forms complete circle hoop, the equilateral long square column
（3）It is fixed on the disc base（6）It is upper, and positioned at the complete circle hoop center, the equilateral long square column（3）
Height be more than or equal to the semicircle hoop（1）Height, the equilateral long square column（3）For hollow-core construction.
2. cement-based material cracking sensitivity test device according to claim 1, it is characterised in that the test device is also
Including gripping hand handle（5）, 2 gripping hand handles（5）It is fixed on the disc base（4）Both sides.
3. according to the cement-based material cracking sensitivity test device described in claim 1, it is characterised in that the test device is also wrapped
Include base（6）, support（7）, image collecting device（8）And data handling system（9）, described image harvester（8）Pass through branch
Frame（7）Installed in the base（6）Vertical direction, the disc base（4）It is placed in the base（6）On, at the data
Reason system（9）With described image harvester（8）Data connect.
4. according to the cement-based material cracking sensitivity test device described in claim 3, it is characterised in that the test device is also wrapped
Include heater（10）, the heater（10）It is arranged on the base（6）Inside, the heater（10）With the number
According to processing system（9）Control connection.
5. according to the cement-based material cracking sensitivity test device described in claim 3, it is characterised in that the device also includes cold
But device（11）, the cooling device（11）It is arranged on the base（6）Inside, the cooling device（11）With the data
Processing system（9）Control connection.
6. according to the cement-based material cracking sensitivity test device described in claim 1-5 any one, it is characterised in that institute
The diagonal line length for stating equilateral long square column is into the interior diameter proportion of complete circle hoop with 2 semicircular ring hoops：0.50-
0.65。
7. a kind of cement-based material cracking sensitivity method of testing, it is characterised in that comprise the following steps that：
Assembling device：First test device is assembled, is placed in keep level on platform, it is standby；
Pouring molding：The match ratio for the cement-based material tested as required prepares corresponding net slurry, mortar or concrete, and
It is cast in the test device that step 1 assembles；
Detection：It it is 20 ± 2 DEG C in temperature, humidity starts timing in the environment of being 60 ± 5 DEG C, and surface of test piece is carried out every 2 h
Observation, opened after 24 hours and be detachably fixed bolt（2）, by 2 semicircle hoops（1）Remove, recording disc base（4）On water
Mud base material initial cracking time and crack number, after Initial Cracking, fracture number when measuring and count respectively 3 d of shaping, 7 d, 14d
Mesh, fracture width；It is quick to the cracking of cement-based material according to the crack number of initial cracking time and regulation age, fracture width
Perception is evaluated.
8. a kind of cement-based material cracking sensitivity method of testing, it is characterised in that comprise the following steps that：
Assembling device：First test device is assembled, is placed in keep level on platform, it is standby；
Pouring molding：The match ratio for the cement-based material tested as required prepares corresponding net slurry, mortar or concrete, and
It is cast in the test device that step 1 assembles；
Detection：It it is 20 ± 2 DEG C in temperature, humidity starts timing in the environment of being 60 ± 5 DEG C, and surface of test piece is carried out every 2 h
Observation, opened after 24 hours and be detachably fixed bolt（2）, by 2 semicircle hoops（1）Remove, start image collecting device（8）、
Heater（10）And cooling device（11）, record initial cracking time at different temperatures, after Initial Cracking, respectively measurement and
Crack number, fracture width when 3 d of statistics shaping, 7 d, 14d, and the data of record are sent to data handling system（9）Enter
Row processing；Data handling system（9）According to the crack number of initial cracking time under different temperatures and regulation age, fracture width
The cracking sensitivity of cement-based material is evaluated, and analysis result is sent to Terminal Server Client by wired or wireless
（12）.
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| CN108414732A (en) * | 2018-05-28 | 2018-08-17 | 华南理工大学 | A kind of round outside but spuare inside crack resistance |
| CN108535459A (en) * | 2018-05-03 | 2018-09-14 | 华南理工大学 | A kind of crack resistance |
| CN109358181A (en) * | 2018-10-23 | 2019-02-19 | 济源市超光传感器系统工程有限公司 | A kind of highly sensitive sensing device for concrete crack detection |
| US11112398B2 (en) | 2018-04-02 | 2021-09-07 | Petrochina Company Limited | Apparatus and method for determining volume stability of well cement |
| CN114088490A (en) * | 2021-11-23 | 2022-02-25 | 安徽理工大学 | Many functions cementitious material test piece preparation mould |
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Effective date of registration: 20210425 Address after: 1 Xicheng District Exhibition Road, Beijing, No. 100035 Applicant after: Beijing University of Civil Engineering and Architecture Applicant after: FOSHAN HUIJIANG CONCRETE Co.,Ltd. Applicant after: FOSHAN HUI RIVER BUILDING MATERIAL Co.,Ltd. Address before: 1 Xicheng District Exhibition Road, Beijing, No. 100035 Applicant before: Beijing University of Civil Engineering and Architecture |