CN108256151A - A kind of cement-based material internal fissure self-healing effect evaluation method - Google Patents
A kind of cement-based material internal fissure self-healing effect evaluation method Download PDFInfo
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- CN108256151A CN108256151A CN201711375026.4A CN201711375026A CN108256151A CN 108256151 A CN108256151 A CN 108256151A CN 201711375026 A CN201711375026 A CN 201711375026A CN 108256151 A CN108256151 A CN 108256151A
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Abstract
The present invention relates to a kind of cement-based material internal fissure self-healing effect evaluation methods, include the following steps：(1) crack is prefabricated with marking：Using inserted sheet method and/or the prefabricated crack of microtomy, and to the cement-based material sample marking in prefabricated crack；(2) it conserves：Cement-based material sample by prefabricated crack and after marking is immersed in the water maintenance；(3) internal fissure healing area, internal fissure healing surface coverage rate and/or the healing bulk product of cement-based material sample marking position after conserving are obtained, the evaluation index data of characterization cement-based material self-healing effect are obtained, and obtain the self-healing evaluation result of corresponding cement-based material.Compared with prior art, the present invention, directly to evaluate cement-based material internal fissure self-healing effect, has the advantages that direct strong, high accuracy, height are innovative by bulk product test of healing to internal crack self-healing area, internal fissure hydrated product surface coverage and internal fissure.
Description
Technical field
The present invention relates to a kind of evaluation method, more particularly, to a kind of cement-based material internal fissure self-healing effect assessment
Method.
Background technology
For concrete material, the either concrete component of reinforced concrete structure still very big thickness, due to shrinking
And the effects that external loads caused crack is inevitable.The presence in crack and continue extension be concrete structural strength drop
The reason of low.Although some microcracks are little to intensity effect, the transmission performance of structure can be increased considerably, nuisance can be caused
Matter is aggravated to structural damage, steel bar corrosion etc. as caused by chlorion and carbon dioxide.Cement-based material self-repairing system is
The reparation of concrete substrate microcrack and effectively delay it is potentially hazardous provide a kind of new method, a self-repairing system will
Remove high cost of the effective monitoring needed for external repair from, and greatly improve its safety and durability.
In order to assess the improvement of cement-based material crack healing ability, need to compare cement matrix before and after self-repair function
The performance of material.Method currently used for characterizing cement-based material selfreparing has very much, such as intensity recovery rate, infiltration coefficient harmony
Launching technique etc., however these methods are all the self-healing capabilities of Indirect evaluation cement-based material crack, have accuracy deficiency
The shortcomings that.The cement-based material healing effect of cracking is most effective, most direct characterizing method is exactly that its crack area is surveyed
Amount, surface crack observes due to being easy to, and the people of research is relatively more, and internal fissure is due to being not easy to observe and measure, usually
Ignored by people.The quality of internal fissure healing effect is directly related to mechanical property and restores and heal the excellent of product stability
It is bad, it is therefore necessary to conduct a research to internal crack self-healing effect.The present invention is based on the above problem and research is unfolded.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide in a kind of cement-based material
Portion's crack self-healing effect evaluation method.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of cement-based material internal fissure self-healing effect evaluation method, includes the following steps：
(1) crack is prefabricated with marking：
Using inserted sheet method and/or the prefabricated crack of microtomy, and to the cement-based material sample marking in prefabricated crack；
(2) it conserves：
Cement-based material sample by prefabricated crack and after marking is immersed in the water maintenance；
(3) internal fissure healing area, the internal fissure healing of the mark position of cement-based material sample after conserving are obtained
Surface coverage rate and/or healing bulk product to get to characterization cement-based material self-healing effect evaluation index data,
And obtain the self-healing evaluation result of corresponding cement-based material.
The present invention can be by comparing commenting for the self-healing effect of different cement-based material samples under the same test conditions
Valency achievement data, you can go out the healing effect of each cement-based material sample with quantitative analysis, especially by by different band from
The cement of healing effect is compared with the evaluation index data of standard group (i.e. general cement), you can quantitatively obtain it is various can from
The self-healing evaluation result of the cement-based material of healing.
Preferably, in step (1) the prefabricated crack of inserted sheet method detailed process：
When cement-based material is molded, it is inserted into the smooth thin slice in surface inside it, after cement-based material is in initial set
During with stage before final set, vertically thin slice from cement-based material is extracted, forms the uniform sample of fracture width；Then, edge
With crack vertical direction sample is cut vertically, and equidistantly marked along the direction vertical with crack in the interior surface for cutting sample
Scribing line；Then, the sample by two pieces of incisions after label is fixed together by original state, that is, it is prefabricated with marking to complete crack.It is thin
The time that piece is extracted cannot it is too early can not be too late, it is too early then to cause to be carried over since cement-based material not yet condenses, so as to
So that it is uneven to form crack, then it is difficult to extract too late.
It is furthermore preferred that the spacing of label is 0.5-1.5cm.
Preferably, the acquisition methods of step (3) internal fissure healing area are specially：
First, it is taken pictures using light microscope to the mark position using the prefabricated crack of inserted sheet method, control when taking pictures every time
The position in crack is in the middle of mark line, and height when taking pictures is consistent with amplification factor every time；
Then, software is recycled to extract in gained bidimensional image each section into bidimensional image the image processing after taking pictures
The healing area of mark, internal fissure healing area are then done for the sum of healing area of all marks and the sum of mark
Quotient, i.e.,：
S=∑ s/n, wherein, S is internal fissure healing area, and ∑ s is the sum of all marks healing area, and n is label
The sum at place.The popular softwares such as Image-Pro Plus6.0 may be used in software.
Preferably, the detailed process in the prefabricated crack of microtomy is in step (1)：
The cement-based material sample after hardened forming is taken to cut, in centerline of surface vertical direction that sample is cut etc.
Pitch mark dot marks square by symmetrical centre of the specimen surface center of incision.
It is furthermore preferred that the measurement process of internal fissure healing surface coverage rate is specially in step (3)：
It is taken pictures using light microscope to the sample fracture faces using the prefabricated crack of microtomy, the position taken pictures every time
The point using the dot of label as imaging center is put, and height of taking pictures every time is consistent with amplification factor；
Then, the healing surface area coverage in image of taking pictures, internal fissure healing surface coverage rate P are extracted
=(∑ m/a)/M, wherein, P is internal fissure healing surface coverage rate, and ∑ m is all marks healing productions of internal fissure
The sum of object surface area coverage, a are the sum of mark, and M is the area of single picture overall area.
It is furthermore preferred that the spacing of the dot of label is 0.5-1.5cm.
It is furthermore preferred that the measurement process of internal fissure healing bulk product is specially in step (3)：
The cement-based material sample prepared using microtomy after maintenance is taken, extracts the healing product of specimen surface, then,
The volume of healing product is measured, then internal fissure healing bulk product is the total volume of all healing products and extraction sliced piece specimen
The ratio between sum, i.e.,：
V=∑ v/k, wherein, V is internal fissure healing bulk product, and ∑ v is the total volume of healing product, and k is extraction
Specimen surface sum.
It is furthermore preferred that the square length of side of label is the 8/10-9/10 of the sample length of side.
It is furthermore preferred that cut specimen surface be also polishing to before label using sand paper it is smooth.Specially with 240 mesh, 400
Mesh, 800 mesh, 1200 mesh and the polishing of 1500 mesh sand paper, each sand paper polishing time is 10-15min, ensures the slice table after polishing
Face smooth enough, so that the later stage can accurately, easily extract healing product, the test block surface that can extract healing product is 8 ± 2
It is a.
Preferably, in step (2), cement base sample enters when being conserved in water, ensures fractuer direction and horizontal plane.
Compared with prior art, the present invention has the following advantages：
(1), method is direct strong：Method for characterizing Crack Self-healing in Cementitious Materials has very much, for example intensity is extensive
Multiple rate, infiltration coefficient harmony launching technique etc., but most directly, most efficient method certainly comment by healing effect at fracture
Valency.
(2), method high accuracy：It is possible, firstly, to the healing effect of quantitatively characterizing internal fissure, secondly, passes through three fingers
Mark is mutually authenticated so that characterization result is more convincing.
(3), method is high innovative：For the direct characterizing method of internal fissure not yet at present, this method uses internal
Crack self-healing area, internal fissure healing surface coverage rate and healing three indexs of bulk product imitate internal crack self-healing
Fruit is characterized, and has high novelty.
(4) cement-based material internal fissure self-healing effect evaluation method of the present invention can be widely applied to water
In work, prevention of marine concrete structures, underground concrete structure.Cement-based material internal fissure self-healing effect evaluation method has it
The advantages of his method is incomparable, accuracy is high, significant effect, has good application prospect.
Description of the drawings
Fig. 1 is the evaluation rubric figure of the present invention；
The prefabricated crack of cement-based material is organized on the basis of Fig. 2 and marks the image after maintenance after different mark positions processing；
Fig. 3 is the internal fissure healing surface coverage rate image of mineral group cement-based material, and wherein Fig. 3 a are mineral
Group healing surface coverage diagram, Fig. 3 b are using Image-Pro Plus6.0 softwares treated image.
Specific embodiment
A kind of cement-based material internal fissure self-healing effect evaluation method, includes the following steps：
(1) crack is prefabricated with marking：
Using inserted sheet method and/or the prefabricated crack of microtomy, and to the cement-based material sample marking in prefabricated crack；
(2) it conserves：
Cement-based material sample by prefabricated crack and after marking is immersed in the water maintenance；
(3) internal fissure healing area, the internal fissure healing of the mark position of cement-based material sample after conserving are obtained
Surface coverage rate and/or healing bulk product to get to characterization cement-based material self-healing effect evaluation index data,
And obtain the self-healing evaluation result of corresponding cement-based material.
The present invention can be by comparing commenting for the self-healing effect of different cement-based material samples under the same test conditions
Valency achievement data, you can go out the healing effect of each cement-based material sample with quantitative analysis, especially by by different band from
The cement of healing effect is compared with the evaluation index data of standard group (i.e. general cement), you can quantitatively obtain it is various can from
The self-healing evaluation result of the cement-based material of healing.
As a kind of preferred embodiment of said program, the detailed process in the prefabricated crack of inserted sheet method in step (1)：
When cement-based material is molded, it is inserted into the smooth thin slice in surface inside it, after cement-based material is in initial set
During with stage before final set, vertically thin slice from cement-based material is extracted, forms the uniform sample of fracture width；Then, edge
With crack vertical direction sample is cut vertically, and equidistantly marked along the direction vertical with crack in the interior surface for cutting sample
Scribing line；Then, the sample by two pieces of incisions after label is fixed together by original state, that is, it is prefabricated with marking to complete crack.
It is furthermore preferred that the spacing of label is 0.5-1.5cm.
As a kind of preferred embodiment of said program, the acquisition methods tool of step (3) internal fissure healing area
Body is：
First, it is taken pictures using light microscope to the mark position using the prefabricated crack of inserted sheet method, control when taking pictures every time
The position in crack is in the middle of mark line, and height when taking pictures is consistent with amplification factor every time；
Then, software is recycled to extract in gained bidimensional image each section into bidimensional image the image processing after taking pictures
The healing area of mark, internal fissure healing area are then done for the sum of healing area of all marks and the sum of mark
Quotient, i.e.,：
S=∑ s/n, wherein, S is internal fissure healing area, and ∑ s is the sum of all marks healing area, and n is label
The sum at place.The popular softwares such as Image-Pro Plus6.0 may be used in software.
As a kind of preferred embodiment of said program, the detailed process in the prefabricated crack of microtomy is in step (1)：
The cement-based material sample after hardened forming is taken to cut, in centerline of surface vertical direction that sample is cut etc.
Pitch mark dot marks square by symmetrical centre of the specimen surface center of incision..
It is furthermore preferred that the measurement process of internal fissure healing surface coverage rate is specially in step (3)：
It is taken pictures using light microscope to the sample fracture faces using the prefabricated crack of microtomy, the position taken pictures every time
The point using the dot of label as imaging center is put, and height of taking pictures every time is consistent with amplification factor；
Then, the healing surface area coverage in image of taking pictures, internal fissure healing surface coverage rate P are extracted
=(∑ m/a)/M, wherein, P is internal fissure healing surface coverage rate, and ∑ m is all marks healing productions of internal fissure
The sum of object surface area coverage, a are the sum of mark, and M is the area of single picture overall area.
It is furthermore preferred that the spacing of the dot of label is 0.5-1.5cm.
As a kind of preferred embodiment of said program, the survey of internal fissure healing bulk product in step (3)
Amount process is specially：
The cement-based material sample prepared using microtomy after maintenance is taken, extracts the healing product of specimen surface, then,
The volume of healing product is measured, then internal fissure healing bulk product is the total volume of all healing products and extraction sliced piece specimen
The ratio between sum, i.e.,：
V=∑ v/k, wherein, V is internal fissure healing bulk product, and ∑ v is the total volume of healing product, and k is extraction
Specimen surface sum.
It is furthermore preferred that the square length of side of label is the 8/10-9/10 of the sample length of side.
It is furthermore preferred that cut specimen surface be also polishing to before label using sand paper it is smooth.Specially with 240 mesh, 400
Mesh, 800 mesh, 1200 mesh and the polishing of 1500 mesh sand paper, each sand paper polishing time is 10-15min, ensures the slice table after polishing
Face smooth enough, so that the later stage can accurately, easily extract healing product, the test block surface that can extract healing product is 8 ± 2
It is a.
As a kind of preferred embodiment of said program, in step (2), cement base sample enters when being conserved in water,
Ensure fractuer direction and horizontal plane.
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
The mineral additive of the Crack Self-healing in Cementitious Materials of following embodiment, by expansion mineral constituent and nucleus mineral
Component forms, and cement composition proportioning is as shown in table 1.
The component that ranks each in table 1 go out is mixed to prepare together and matches the cement composition for I-II (outside cement and mineral
Add agent, cement is P.O.52.5 cement), then quality is accounted for 30% water of cement composition and adds in the cement of said ratio I-II
It is stirred in composition, in the die for molding of 70mm × 70mm × 70mm, obtains cement-based material sample, a portion sample
Need to carry out that crack is prefabricated, and inserted sheet length is 8cm, and thickness 0.5mm demoulds after 24 hours in forming process using inserted sheet method,
After crack is prefabricated with cutting machine along and crack vertical direction cut, and made along fractuer direction inside crack of signature pen vertical
1.5cm directly is divided between the label in crack, two labels, shares and is marked at 4, then consolidate two test blocks by original state
It is scheduled on the environment maintenance 7d for together, being placed in that room temperature is 20 DEG C, humidity is 45-55%.
Another part sample is equally put into room temperature is 20 DEG C, humidity is 45-55% environment 7d, 7d after being molded, demoulding
Afterwards with the prefabricated crack of microtomy, test block surface vertical direction midline marker dots are being cut, are needing to be marked every 1cm,
7 marks altogether；
Part III sample is equally put into room temperature is 20 DEG C, humidity is 45-55% environment 7d, 7d after being molded, demoulding
Afterwards with the prefabricated crack of microtomy, square, the square length of side of label are marked by symmetrical centre of the specimen surface center of incision
It is the 6/7 of the sample length of side, is then polished using sand paper marked region, obtains the smooth label test block table in 8 surfaces altogether
Face.
It is finally immersed in the water maintenance 28d respectively, continues to operate according to step shown in FIG. 1.
Proportioning/% of 1 cement composition of table
The prefabricated crack of cement-based material is organized on the basis of Fig. 2 and conserves the two dimensional image of different marks after molding, Fig. 2 a- figures
2d shows respectively the two dimensional image of label 1- labels 4, as seen from Figure 2, can be clear in two dimensional image after treatment
See the white healing product at crack openings both ends, the area of whiteness is then can extract out using software, concrete outcome is shown in
Table 2.
Fig. 3 is mineral group internal fissure healing product distributed image, and wherein Fig. 3 a are the healing surface covering of mineral group
Figure, Fig. 3 b are using Image-Pro Plus6.0 softwares treated image, and grey area is healing surface covering
Area as seen from Figure 3, after software is handled, can accurately extract the area coverage of slice surface healing product, equally
It can obtain the gross area of picture, and then calculate healing surface coverage rate, concrete outcome is shown in Table 3.
Table 2-4 is respectively internal fissure healing area, internal fissure healing surface coverage rate and healing bulk product
Result of calculation, it can be seen that the internal fissure healing area for adding mineral group sample is more slightly lower than benchmark group, but its internal fissure
The surface coverage rate that heals and healing bulk product are far above benchmark group, and comprehensive analysis is it is found that add the examination of mineral material
Block has better internal fissure healing effect.
2 internal fissure of table healing area/mm2
3 internal fissure of table healing surface coverage rate/%
4 internal fissure of table healing bulk product/mm3
The above description of the embodiments is intended to facilitate ordinary skill in the art to understand and use the invention.
Person skilled in the art obviously can easily make these embodiments various modifications, and described herein general
Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to above-described embodiment, abilities
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be the present invention's
Within protection domain.
Claims (10)
1. a kind of cement-based material internal fissure self-healing effect evaluation method, which is characterized in that include the following steps：
(1) crack is prefabricated with marking：
Using inserted sheet method and/or the prefabricated crack of microtomy, and to the cement-based material sample marking in prefabricated crack；
(2) it conserves：
Cement-based material sample by prefabricated crack and after marking is immersed in the water maintenance；
(3) internal fissure healing area, the internal fissure healing product table of cement-based material sample marking position after conserving are obtained
Face coverage rate and/or healing bulk product and obtain to get to the evaluation index data of characterization cement-based material self-healing effect
The self-healing evaluation result of corresponding cement-based material.
2. a kind of cement-based material internal fissure self-healing effect evaluation method according to claim 1, which is characterized in that
The prefabricated crack of inserted sheet method and the detailed process marked in step (1)：
When cement-based material is molded, the smooth thin slice in surface is inserted into the direction vertical with forming surface inside it, in cement base
Before material solidification completely, vertically thin slice from cement-based material is slowly extracted, forms the uniform sample of fracture width；Then,
Along with crack vertical direction sample is cut vertically, and equidistantly marked along the direction vertical with crack in the interior surface for cutting sample
Note scribing line；Then, the sample by two pieces of incisions after label is fixed together by original state, that is, it is prefabricated with marking to complete crack.
3. a kind of cement-based material internal fissure self-healing effect evaluation method according to claim 2, which is characterized in that
The spacing of label is 0.5-1.5cm.
4. a kind of cement-based material internal fissure self-healing effect evaluation method according to claim 2, which is characterized in that
Step (3) internal fissure healing area acquisition methods be specially：
First, it is taken pictures using light microscope to the mark position using the prefabricated crack of inserted sheet method, control critical eigenvalue when taking pictures every time
In the middle of mark line, and height when taking pictures is consistent with amplification factor every time；
Then, software is recycled to extract each segment mark in gained bidimensional image into bidimensional image the image processing after taking pictures
The healing area at place, internal fissure healing area are then quotient for the sum of healing area of all marks and the sum of mark,
I.e.：
S=∑ s/n, wherein, S is internal fissure healing area, and ∑ s is the sum of all marks healing area, and n is mark
Sum.
5. a kind of cement-based material internal fissure self-healing effect evaluation method according to claim 1, which is characterized in that
The detailed process in the prefabricated crack of microtomy is in step (1)：
The cement-based material sample after hardened forming is taken, along with being cut at the center of forming surface vertical direction, for more
Surface coverage rate test is closed, in the equidistant marker dots of centerline for the surface vertical direction that sample is cut；For more
Bulk product test is closed, square is marked by symmetrical centre of the specimen surface center of incision.
6. a kind of cement-based material internal fissure self-healing effect evaluation method according to claim 5, which is characterized in that
The measurement process of internal fissure healing surface coverage rate is specially in step (3)：
It is taken pictures to the sample fracture faces using the prefabricated crack of microtomy after maintenance using light microscope, taken pictures every time
Position using the dot of label as imaging center point, and every time take pictures height it is consistent with amplification factor；
Then, the healing surface area coverage in image of taking pictures, internal fissure healing surface coverage rate P=are extracted
(∑ m/a)/M, wherein, P is internal fissure healing surface coverage rate, and ∑ m is all marks healing products of internal fissure
The sum of surface area coverage, a are the sum of mark, and M is the area of single picture overall area.
7. a kind of cement-based material internal fissure self-healing effect evaluation method according to claim 5, which is characterized in that
The spacing of the dot of label is 0.5-1.5cm.
8. a kind of cement-based material internal fissure self-healing effect evaluation method according to claim 5, which is characterized in that
The measurement process of internal fissure healing bulk product is specially in step (3)：
The cement-based material sample prepared using microtomy after maintenance is taken, extracts the healing production of specimen surface in marked region
Then object, measures the volume of healing product, then total volume and extraction of the internal fissure healing bulk product for all healing products
The ratio between sum of sliced piece specimen, i.e.,：
V=∑ v/k, wherein, V is internal fissure healing bulk product, and ∑ v is the total volume of healing product, and k is total for slice surface
Number.
9. a kind of cement-based material internal fissure self-healing effect evaluation method according to claim 5, which is characterized in that
The square length of side of label is the 8/10-9/10 of the sample length of side；
The specimen surface of incision is also polishing to smooth before label using sand paper.
10. a kind of cement-based material internal fissure self-healing effect evaluation method according to claim 1, feature exist
In in step (2), cement base sample enters when being conserved in water, ensures fractuer direction and horizontal plane.
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| CN109374870B (en) * | 2018-12-27 | 2024-03-29 | 中交武汉港湾工程设计研究院有限公司 | Method and device for evaluating repairing performance of cement-based self-repairing material |
| CN116597926B (en) * | 2023-06-02 | 2024-02-23 | 山东大学 | Design system and method for high-ductility cement-based repair material for dichotomy crack development |
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