CN109521186A - One kind probing into the dynamic (dynamical) test method of crack autogenous healing - Google Patents
One kind probing into the dynamic (dynamical) test method of crack autogenous healing Download PDFInfo
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- CN109521186A CN109521186A CN201811448462.4A CN201811448462A CN109521186A CN 109521186 A CN109521186 A CN 109521186A CN 201811448462 A CN201811448462 A CN 201811448462A CN 109521186 A CN109521186 A CN 109521186A
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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
- G01N33/383—Concrete, cement
Abstract
The invention discloses one kind to probe into the dynamic (dynamical) test method of crack autogenous healing.The method comprising the steps of: (1) preparing the controllable cement-based material test specimen of fracture width；(2) test specimen is put into container, a surface of test piece for preparing observation is placed upward, then adds the solution to concordant with sample upper surface；(3) crack self-healing situation is persistently observed with stereomicroscope, since adding after solution, is taken pictures at regular intervals.It is proposed by the present invention to probe into the dynamic (dynamical) test method of crack autogenous healing, the repair process in a certain section of crack of test specimen can be carried out continuing observation, the different repair processes for repairing position can also be observed simultaneously, it is easy to operate, practical, obtained experimental result provides important evidence to the dynamic process for probing into crack autogenous healing.
Description
Technical field
The invention belongs to cement-based material crack selfreparing fields, and in particular to it is dynamic (dynamical) that one kind probes into crack autogenous healing
Test method.
Background technique
Armored concrete is construction material most widely used in the world, and wherein reinforcing bar bears tensile stress, and concrete bears pressure
Stress, meanwhile, concrete is used as cover to reinforcement also to guarantee that reinforcing bar does not generate corrosion and destruction.But concrete material is in its clothes
It is influenced during labour by factors such as temperature and humidity, external loads, is easy to produce various sizes of crack.Concrete is carried out in crack
Say it is an inevitable problem.The presence meeting in crack so that concrete material waterproof degradation, can reduce certain
The water-proof function of building structure.If containing corrosive medium in water, sustaining breakdown effect can be generated, coagulation can be not only promoted
Soil deteriorates itself, also corrodes reinforcing bar, shortening structure service life.
In fact, early having document report concrete inherently has certain self-reparing capability, anti-permeability performance can be improved,
Extend the service life of building structure.But the self-reparing capability of concrete itself is relied on still to be not enough to repair in a short time to split
Seam, the destruction of corrosive medium can not be ignored within the reparation phase, and the repair ability of itself is extremely limited, Zhi Nengxiu
The multiple crack less than 60 μm.For this purpose, domestic and foreign scholars propose many new technologies to promote coagulation in research in recent years
The efficiency and ability of native selfreparing, for example microorganism induction mineralising tosca technology, the crack based on liquid renovation agent are certainly
Recovery technique and based on addition active component self-repair technology.At the same time, researcher is to probe into different self-repair technologies
Dynamic process also proposed many test methods, such as: gas or Liquid Penetrant test, Mechanics Performance Testing, sound emission
The methods of test, electro-chemical test, x-ray tomography and neutron imaging.Above-mentioned gas, Liquid Penetrant test and mechanical property
Can test can all have a certain impact to test specimen, and the test result that the method for acoustic emission test and electro-chemical test obtains can only
Reflect repairing effect indirectly by signal strength.Two kinds of test methods of x-ray tomography and neutron imaging are then had both
Non-destructive testing and the advantages of persistently observe, but corresponding testing cost is high, and application is relatively fewer.It is therefore proposed that one kind can
The dynamic (dynamical) test method of crack autogenous healing of probing into for taking into account validity and economy is self-repairing of concrete cracks area research
Personnel's urgent problem to be solved.
Summary of the invention
It is an object of the invention in view of the above problems, propose a kind of validity and economy of capable of taking into account
The dynamic (dynamical) test method of crack autogenous healing is probed into, this kind of method is easy to operate, and it is practical, it can effectively observe crack certainly
Repair the process in product filling crack.
The purpose of the present invention is achieved through the following technical solutions.
One kind probing into the dynamic (dynamical) test method of crack autogenous healing, includes the following steps:
(1) the controllable cement-based material test specimen of fracture width is prepared；
(2) test specimen is put into container, a surface of test piece for preparing observation is placed upward, then adds the solution to and sample
Upper surface is concordant；
(3) crack self-healing situation is persistently observed with stereomicroscope, since adding after solution, is taken pictures at regular intervals.
Further, in step (1), the step of preparing fracture width controllable test specimen, is as follows: preparing cuboid cement base
The test specimen with or without renovation agent can be arranged, after maintenance to certain age, using three-point bending in material test specimen by research contents
Method test specimen is fractureed, select for a post on a fracture surface pasted on four corners determine thickness thin slice after sample is spliced again together, with
This is prepared with the test specimen for determining fracture width, and wherein fracture width is controlled by sheet thickness.
Further, in step (2), when test specimen is placed in a reservoir, need to test specimen two ends bottom place two pieces of stoppers with
Prevent fracture surface from contacting with based container.
Further, in step (2), it can be light that the solution, which needs to be determined according to the different repairing conditions studied,
Water, seawater, salt lake saline etc..
Compared with prior art, the present invention has the following technical effect that
It is proposed by the present invention to probe into the dynamic (dynamical) test method of crack autogenous healing, it can be to the repair process in a certain section of crack of test specimen
It carries out continuing observation, the different repair processes for repairing position can also be observed simultaneously, it is easy to operate, it is practical, obtain experiment
As a result important evidence is provided to the dynamic process for probing into crack autogenous healing.
Detailed description of the invention
Fig. 1 is prepared in step (1) with the schematic diagram for determining fracture width test specimen.
Fig. 2 is in the real-time healing state photo of different time crack different location.
Specific embodiment
Technical solution of the present invention is described in further detail below in conjunction with specific embodiment and attached drawing, but of the invention
Protection scope and embodiment are without being limited thereto.
In the specific embodiment of the invention, raw materials used is II 42.5 cement of P, and the sample dimensions used is 40mm*40mm*
The net slurry test specimen of 160mm, added renovation agent are crystal type renovation agent, and volume is the 1.5wt% of cement consumption.Test piece maintenance complete 7
The crack that width is about 300 μm is set after it, and the repairing environment studied is briny environment, therefore preparing simulated seawater is experiment
Solution.
Embodiment 1:
1600g cement, 480g water are weighed by quality, weighs the triethanolamine of 1.5 wt% of cementitious material (cement) dosage.By three second
Hydramine is first dissolved in water, then the test specimen for 40mm*40mm*160mm being prepared after mixing water and cement mixing, test piece maintenance 7
The crack that width is 300 μm is set after it, first the method for cuboid test specimen three-point bending fractures, selects for a post four on a fracture surface
It pastes on corner and sample is spliced again together after determining thickness thin slice, fix (see figure 1) with adhesive tape.It is then placed in configuration
Simulated seawater solution in, crack self-healing process is observed by stereomicroscope.
It is observed that without any sediment at 0h surface of test piece and crack mouth；It is split at position 3,4 and 5 after 2h
Sealing has the sediment of suspension, and crack mouthful is filled up completely by sediment substantially at position 6, but product layer is in than relatively thin
Transparence；During 4-8 hours, the sediment to be suspended at the position 3,4 and 5 at the mouth of crack is being continuously increased, and is being split
Seam surface has to be started to occur and be continuously increased than one layer of relatively thin product, and the sediment in crack mouthful is also being continuously increased at position 6
Product layer, which has begun, to thicken；The sediment to suspend at crack mouthful at 10-12 hours course locations 3,4 and 5, which has been deposited in, to be split
On sealing, the product layer thickness in crack mouthful continues growing completely opaque (see figure 2) at position 6.
It is analyzed, is concluded that by the observed result for continuing 12h to test specimen
Mixed with crystal type renovation agent early process, there are two types of modes, the first directly adsorbs the ion in environment for fracture surface, with
The ion dissolved out from matrix reacts, and is formed directly on fracture surface and repairs product, and such reparation product
Can steadily it be present on fracture surface relatively；Be for second dissolution ion in the solution near crack in environment from
Son reacts and generates precipitating, has partly precipitated that can be deposited directly to surface of test piece (the test specimen face of exposure around crack), has
Part suspends in water, is deposited on crack Kou Chu together until repairing after product is reunited with other.
Claims (5)
1. one kind probes into the dynamic (dynamical) test method of crack autogenous healing, which comprises the steps of:
(1) the controllable cement-based material test specimen of fracture width is prepared；
(2) test specimen is put into container, a surface of test piece for preparing observation is placed upward, then adds the solution to and sample
Upper surface is concordant；
(3) crack self-healing situation is persistently observed with stereomicroscope, since adding after solution, is taken pictures at regular intervals.
2. the method according to claim 1, wherein preparing the controllable cement matrix of fracture width in step (1)
The step of expecting test specimen is as follows: cuboid cement-based material test specimen prepared, the test specimen with or without renovation agent is set by research contents,
After maintenance to certain age, test specimen is fractureed using the method for three-point bending, selects for a post and pastes determination on a fracture surface on four corners
Sample is spliced together again after thickness thin slice, is prepared with this with the test specimen for determining fracture width, wherein fracture width is by thin
Piece thickness control.
3. the method according to claim 1, wherein when test specimen is placed in a reservoir, need to tried in step (2)
Two pieces of stoppers are placed to prevent fracture surface from contacting with based container in part both ends bottom.
4. the method according to claim 1, wherein in step (2), the solution is needed according to being studied not
It is determined with repairing condition.
5. the method according to claim 1, wherein the solution is fresh water, seawater or salt lake in step (2)
Water.
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Cited By (4)
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| CN110411829A (en) * | 2019-07-23 | 2019-11-05 | 北京科技大学 | The measurement method of individual particle SAPs expansion rate in a kind of crack |
| CN110646594A (en) * | 2019-10-18 | 2020-01-03 | 无锡地铁集团有限公司 | Underground structure top crack indoor simulation device based on electrodeposition restoration |
| CN114705842A (en) * | 2022-06-06 | 2022-07-05 | 中建安装集团有限公司 | Simulation monitoring system and method for microbial self-repairing concrete cracks |
| CN115032373A (en) * | 2022-05-31 | 2022-09-09 | 上海建工建材科技集团股份有限公司 | Testing device and testing method for repairing effect of underwater microorganism self-healing concrete crack |
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| CN115032373A (en) * | 2022-05-31 | 2022-09-09 | 上海建工建材科技集团股份有限公司 | Testing device and testing method for repairing effect of underwater microorganism self-healing concrete crack |
| CN114705842A (en) * | 2022-06-06 | 2022-07-05 | 中建安装集团有限公司 | Simulation monitoring system and method for microbial self-repairing concrete cracks |
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Application publication date: 20190326 |