CN110044811A - A kind of solid concrete low-temperature resistance sulfate attack performance testing device and method - Google Patents
A kind of solid concrete low-temperature resistance sulfate attack performance testing device and method Download PDFInfo
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- CN110044811A CN110044811A CN201910368670.1A CN201910368670A CN110044811A CN 110044811 A CN110044811 A CN 110044811A CN 201910368670 A CN201910368670 A CN 201910368670A CN 110044811 A CN110044811 A CN 110044811A
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- sulfate attack
- temperature resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/04—Corrosion probes
- G01N17/043—Coupons
Abstract
The invention belongs to concrete structures to test field, being related to a kind of solid concrete low-temperature resistance sulfate attack performance testing device and method, the device includes cryogenic box, concrete corrosion case, drilling, water-absorbing sponge, epoxy resin sealant, anode, cathode, impulse generator, leakage fluid dram；The concrete corrosion case is placed in inside the cryogenic box, and the concrete corrosion case adds sulfate attack liquid after being used to dispose the core sample of concrete solid structure；The epoxy resin sealant is covered in the top of entity structure concrete core sample；The cathode immerses in the sulfate attack liquid, and anode is inserted at the top of concrete core sample, and the impulse generator provides DC pulse current.The present invention realizes the fast and effective test of concrete solid structure low-temperature resistance sulfate attack performance, and easy to operate, test period is short；Erosion degree is characterized using the method for test concrete itself electrochemical parameter variation, overcomes the problem of repeatability and accuracy deficiency in conventional test methodologies, test method is more scientific, stablizes and has repeatability.
Description
Technical field
The invention belongs to concrete structures to test field, be related to a kind of solid concrete low-temperature resistance sulfate attack performance survey
Try device and method.
Background technique
Sulfate attack is one of the important factor in order for causing concrete solid structure service life to shorten.With regard to sulfate
For erosion type, gypsum mould can be divided mainly into, entringite type corrodes and thaumasite type corrodes (Thaumasite form
Of sulfate attack, abbreviation TSA), wherein TSA erosion will lead to concrete material argillization and lose intensity, in turn result in
Concrete structure seriously destroys, so that the service life of engineering entity structure is greatly lowered.TSA corrode notable feature it
One, the object for being exactly corrosion failure is hydrolysis product of cement C-S-H gel, generates canescence gunk, makes cement concrete
Lose bonding capacity.Therefore its destruction is big more than other types sulfate attack harmfulness and concealment is strong.TSA erosion is easy to
Environment temperature lower than occur at 15 DEG C (applicant's studies have shown that 20 DEG C of under the conditions ofs thaumasite corrosion can also occur, and
Temperature is lower when within the scope of -5 DEG C~20 DEG C of temperature, and TSA corrodes more serious).Concrete Sulfate Attack speed generally all compares
Relatively slow, the formation speed of thaumasite is more slow, this brings inconvenience, many to the scholar for studying its structure and performance
Person uses different accelerated methods to accelerate its generation.Complete immersion method is a kind of acceleration thaumasite more generallyd use
The method of formation, thaumasite generating rate is slower, and " gunk " carbon sulphur silicon can just be had for 1 year or more by generally requiring
Calcium stone corrosion product generates, but " gunk " occurs and then need as long as the several years, it is difficult to it is quick to meet agent on crack resistance of concrete TSA performance
Evaluation requires；Inner blending method is to mix sulfate inside test specimen in sample preparation, then impregnates test specimen in water, can be at 6
Accelerate the generation of thaumasite in month, but this method can not be detected using with Practical Project concrete structure.
When Practical Project concrete is under low temperature and sulfate collective effect, in the corrosion product of cement concrete not
Only include thaumasite, also includes that corrosion products, the Slope protections of concrete material such as entringite, gypsum come not only from sulphur
Hydrochlorate chemical attack, it is similarly subjected to the influences of physical crystal expansion damage.Therefore, the application is directed to agent on crack resistance of concrete low temperature
Sulfate attack performance, and not only corroded just for concrete T SA.
China is main to use " normal concrete long-term behaviour in it can test Sulfate Resistance of Concrete at present
With endurance quality test method standard " Testing Resistance of Concrete To Sulfate method in (GB/T 50082-2009), this method
Decline maximum drying moistening cycle when being not less than 75% by concrete crushing strength corrosion resistance index to evaluate concrete sulfur resistive
Hydrochlorate erosion performance, its main feature is that operation and calculating are simple, suitable for concrete material of the measurement in dry wet alternating environment
Material.But it needs for concrete to be soaked in 25~30 DEG C of Na during test2SO4It, need to be 80 in subsequent taking-up air drying process in solution
The long period is dried at DEG C, so that concrete material is difficult to happen low temperature sulfate attack during the test.Meanwhile this method
Test period is too long, repeated deficiency, if such as detection concrete whether reach KS150 grade and generally require 180 days or more
Test period.And foreign countries generally use the sulfate liquor proposed in Unite States Standard (ASTM C1012/C1012M) and impregnate environment
Lower cement mortar length changes test method, and this method can be tested mainly for Sulfate Resistance of Cement Mortar, Wu Fazhen
Erosion process of the real reflection concrete solid structure in condition of sulfate.
Summary of the invention
In view of this, it is short the purpose of the present invention is to provide a kind of test period, easily to operate be directed to solid concrete
The test device and method of low-temperature resistance sulfate attack performance.
In order to achieve the above objectives, the invention provides the following technical scheme:
A kind of solid concrete low-temperature resistance sulfate attack performance testing device, including cryogenic box, concrete corrosion case, brill
Hole, water-absorbing sponge, epoxy resin sealant, anode, cathode, impulse generator, leakage fluid dram；The concrete corrosion case is placed in institute
It states inside cryogenic box；The concrete corrosion case adds sulfate attack liquid after being used to dispose the core sample of concrete solid structure,
And the leakage fluid dram of sulfate attack liquid is had on the concrete corrosion case；The anode and water-absorbing sponge are located at solid concrete core
Bore inner at the top of sample；The water-absorbing sponge is for fixing the anode；The epoxy resin sealant is covered in concrete core
Bore surfaces at the top of sample；The cathode immerses in the sulfate attack liquid；The impulse generator connects the anode and yin
Pole provides unidirectional pulse electric current.
Optionally, the concrete corrosion case is organic glass cabinet.
Optionally, the anode and the preferred stud of cathode or titanium plate.
A kind of solid concrete low-temperature resistance sulfate attack performance test methods, comprising the following steps: in concrete to be measured
Core boring sampling is carried out in entity structure；The concrete core sample drilled through is processed into cylindrical body, using concrete drill hole device to coagulation
Core sample top surface drills, and in remaining region brushing modified epoxy sealing material of concrete core sample bore surfaces, brushes
Certain time is stood after the completion；Concrete core sample after brush seals material is placed in concrete corrosion case, to concrete
It corrodes and sulfate attack liquid is added in case, the liquid level of sulfate attack liquid is lower than concrete core sample top surface；Concrete will be loaded with
The concrete corrosion case of core sample and sulfate attack liquid is placed in inside cryogenic box；Anode and water-absorbing sponge are placed in concrete core
In sample drilling, cathode immerses in sulfate attack liquid, and impulse generator is connect with anode and cathode and provides unidirectional pulse electricity
Stream；Start cryogenic box to the sulfate attack under concrete core sample progress low temperature；The concrete core sample corroded that will be powered takes out, knot
Shu Tong electricity and the electrochemical parameter for testing concrete core sample.
Optionally, concrete core sample drilling depth is 18~20mm, and aperture is 18~20mm.
Optionally, the pulse current of application is 10~40V of voltage, and the unidirectional pulse of pulse frequency 10s~30s is straight
Galvanic electricity.
Optionally, the liquid level of sulfate attack liquid is lower than concrete core sample top surface 5mm.
Optionally, the concrete core sample, which is powered, corrodes 1 month~3 months.
Optionally, the electrochemical parameter is transient state resistance and AC impedance, and the measurement of the electrochemical parameter specifically includes
Following steps, the concrete core sample after corroding that will be powered take out；Concrete core sample bore surfaces connecting test instrument anode, separately
One rounded face connecting test instrument cathode；The transient state resistance and AC impedance for testing concrete core sample are for several times；The transient state that will be obtained
Resistance and ac impedance measurement result be averaged respectively as last test data, and with corrode before concrete core sample
Transient state resistance and AC impedance compare.
Optionally, which is applied to above-mentioned solid concrete low-temperature resistance sulfate attack performance testing device.
The beneficial effects of the present invention are:
The present invention uses electric field acceleration sulfate attack substance to enter concrete solid structural core sample at low ambient temperatures
Method, easy to operate, test period is shorter, and concrete solid structure low-temperature resistance sulfuric acid salt contamination can not quickly and effectively be tested by solving
The problem of corrosion energy；The present invention is invaded using the low temperature sulfate of transient state resistance and the characterized concrete solid structure of AC impedance
Degree of corrosion overcomes repeatability and accuracy deficiency etc. brought by strength test in traditional sulfuric-resisting erosion performance test and asks
Topic realizes the test accurate, stable and repeatable to concrete solid structure low-temperature resistance sulfate attack performance.
Other advantages, target and feature of the invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.Target of the invention and other advantages can be realized by following specification and
It obtains.
Detailed description of the invention
To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is made below in conjunction with attached drawing excellent
The detailed description of choosing, in which:
The structural schematic diagram of device in Fig. 1 present invention；
Fig. 2 is the front view of device in the present invention；
Fig. 3 is the top view of device in the present invention.
Fig. 4 used pulsed electric field waveforms figure when being present invention application.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that diagram provided in following embodiment is only to show
Meaning mode illustrates basic conception of the invention, and in the absence of conflict, the feature in following embodiment and embodiment can phase
Mutually combination.
Wherein, the drawings are for illustrative purposes only and are merely schematic diagrams, rather than pictorial diagram, should not be understood as to this
The limitation of invention；Embodiment in order to better illustrate the present invention, the certain components of attached drawing have omission, zoom in or out, not
Represent the size of actual product；It will be understood by those skilled in the art that certain known features and its explanation may be omitted and be in attached drawing
It is understood that.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention；It is retouched in of the invention
In stating, it is to be understood that if there is the orientation or positional relationship of the instructions such as term " on ", "lower", "left", "right", "front", "rear"
To be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description of the present invention and simplification of the description, rather than indicate or
It implies that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore is described in attached drawing
The term of positional relationship only for illustration, is not considered as limiting the invention, for the ordinary skill of this field
For personnel, the concrete meaning of above-mentioned term can be understood as the case may be.
Fig. 1-Fig. 4 is please referred to, the element numbers in attached drawing respectively indicate: cryogenic box 1, concrete corrosion case 2, sulfuric acid salt contamination
Lose liquid 4, drilling 5, water-absorbing sponge 6, epoxy resin sealant 7, anode 8, cathode 9, impulse generator 10, leakage fluid dram 11.
The present invention provides a kind of solid concrete low-temperature resistance sulfate attack performance testing device, including it is cryogenic box 1, mixed
Solidifying soil corrodes case 2, sulfate attack liquid 4, drilling 5, water-absorbing sponge 6, epoxy resin sealant 7, anode 8, cathode 9, pulse hair
Raw device 10, leakage fluid dram 11.
The cryogenic box 1 has temperature controlling function, guarantees that 1 internal temperature of cryogenic box is steady in a long-term；The concrete corrosion case 2
It is placed in cryogenic box 1, for holding the concrete core sample 3 of entity structure to be measured；The concrete corrosion case 2 is diameter 160mm,
The cylindrical uncovered box of high 150mm, material are organic glass；The sulfate attack liquid 4 is located at concrete corrosion case 2
Interior, the type of sulfate attack liquid 4 is determined according to concrete solid structure periphery condition of sulfate to be measured；For the ease of more
Sulfate attack liquid 4 is changed, is equipped with the leakage fluid dram 11 of sulfate attack liquid in the lower right side of concrete corrosion case 2；The concrete
Core sample 3 is located at the central region of concrete corrosion case 2；3 end face center of the concrete core sample setting drilling 5, remaining region is covered
Bezel ring, oxygen sealing layer of resin 7；The water-absorbing sponge 6 and anode 8 are placed in drilling 5, wherein the water-absorbing sponge 6 is used for anode 8
Position, while electrode reaction influence caused by test that anode 8 generates when eliminating energization；The anode 8 and cathode 9 are preferred
Stud reduces the pollution to concrete core sample 3 to be measured to prevent anode 8 to be damaged by corrosion in a short time with 9 material of cathode；
The cathode 9 immerses in sulfate attack liquid 4.The positive wire jointed anode 8 of the impulse generator 10, negative wire connection
Cathode 9, for providing unidirectional pulse direct current.The leakage fluid dram 11 is tilted a certain angle, and facilitates the row of sulfate attack liquid 4
Out.
The present invention also provides a kind of solid concrete low-temperature resistance sulfate attack performance test methods, including following step
It is rapid:
Step 1: core boring sampling, 100~150mm of depth selection, concrete core are carried out in concrete solid structure to be measured
Sample diameter 100mm, the concrete core sample remain intact in 100mm altitude range；
Step 2: the concrete core sample drilled through being processed into the cylindrical body of high 100mm, using 5 device of concrete drill hole in coagulation
It is 18~20mm that an aperture is bored in core sample top surface, and hole depth is the circular hole of 18~20mm, in remaining of 5 faces of concrete core sample drilling
Brushing modified epoxy sealing material in region stands 24 hours after the completion of brushing；
Step 3: the concrete core sample after brush seals material being placed in concrete corrosion case 2, to concrete corrosion
Sulfate attack liquid 4 is added in case 2, the liquid level of sulfate attack liquid 4 is lower than concrete core sample top surface 5mm；
Step 4: the concrete corrosion case 2 for being loaded with concrete core sample and sulfate attack liquid 4 is placed in cryogenic box 1
Portion；
Step 5: anode 8 and water suction saturated sponge being placed in concrete core sample drilling 5, cathode 9 immerses sulfate attack
In liquid 4, and impulse generator 10 is connect with anode 8 and cathode 9, unidirectional pulse electric current is provided；
Step 6: starting cryogenic box 1 carries out the sulfate attack under low temperature to concrete core sample, and setting 1 temperature of cryogenic box is
5℃；
Step 7: the concrete core sample after corroding 30 days that will be powered takes out, and terminates the electrification for being powered and testing concrete core sample
Learn parameter.
Step 71: the concrete core sample after corroding that will be powered takes out；
Step 72: 5 face connecting test instrument anode of concrete core sample drilling, another rounded face connecting test instrument cathode；
Step 73: the transient state resistance and AC impedance for testing concrete core sample are for several times；
Step 74: obtained transient state resistance and ac impedance measurement result are averaged respectively as last test number
According to, and compared with the transient state resistance and AC impedance for corroding preceding concrete core sample.
During the test, constant voltage can be used, the unidirectional pulse direct current of fixed frequency is powered, the present invention in adopt
With the unidirectional pulse direct current that voltage is 30V, frequency is 20s.Electrode reaction can occur at electrode during the energization, in this hair
Anode 8 is separated with concrete core sample by water-absorbing sponge 6 in bright, electrode reaction is to test bring shadow at elimination anode 8
It rings.
Under DC Electric Field, zwitterion meeting directional migration, wherein anion is migrated by electric field cathode 9 to electric field sun
Pole 8.In test method of the invention, pass through unidirectional pulse direct current accelerated erosion anion SO4 2-By sulfate attack liquid 4
In 9 end of electric field cathode migrate 8 end of anode to concrete core sample, the SO in fast lifting concrete core sample4 2-Content, from
And accelerate the rate of sulfate attack.While concrete core sample is easier to generation low temperature sulfate in 5 DEG C of cryogenic box of environment and invades
Erosion, increases the testing efficiency of concrete solid structure low-temperature resistance sulfate attack performance, energization erosion time only need 1 month~
3 months.
In test method of the invention, characterized by the transient state resistance and AC impedance of concrete core sample after test erosion
Test specimen low temperature sulfate erosion degree.The variation of transient state resistance and AC impedance can reflect to fast and stable the low of concrete core sample
Warm sulfate attack degree, to evaluate the low-temperature resistance sulfate attack performance of concrete solid structure.Simultaneously transient state resistance and
The test of ac impedance spectroscopy has repeatability, improves the accuracy in test.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of the technical program, should all be covered in the present invention
Scope of the claims in.
Claims (10)
1. a kind of solid concrete low-temperature resistance sulfate attack performance testing device, it is characterised in that: including cryogenic box, concrete
Corrode case, drilling, water-absorbing sponge, epoxy resin sealant, anode, cathode, impulse generator, leakage fluid dram；The concrete is invaded
Erosion case is placed in inside the cryogenic box；The concrete corrosion case adds sulfuric acid after being used to dispose the core sample of concrete solid structure
Salt corrosion liquid, and the leakage fluid dram of sulfate attack liquid is had on the concrete corrosion case；The anode and water-absorbing sponge are located at real
Drilling at the top of body concrete core sample；The water-absorbing sponge is for fixing the anode；The epoxy resin sealant is covered in mixed
Bore surfaces at the top of solidifying core sample；The cathode immerses in the sulfate attack liquid；The impulse generator connects the sun
Pole and cathode provide unidirectional pulse electric current.
2. solid concrete low-temperature resistance sulfate attack performance testing device as described in claim 1, it is characterised in that: institute
Stating concrete corrosion case is organic glass cabinet.
3. solid concrete low-temperature resistance sulfate attack performance testing device as described in claim 1, it is characterised in that: institute
State anode and the preferred stud of cathode or titanium plate.
4. a kind of solid concrete low-temperature resistance sulfate attack performance test methods, which comprises the following steps:
Core boring sampling is carried out in concrete solid structure to be measured；
The concrete core sample drilled through is processed into cylindrical body, is drilled using concrete drill hole device to concrete core sample top surface,
In remaining region brushing modified epoxy sealing material of concrete core sample bore surfaces, certain time is stood after the completion of brushing；
Concrete core sample after brush seals material is placed in concrete corrosion case, sulfuric acid is added into concrete corrosion case
The liquid level of salt corrosion liquid, sulfate attack liquid is lower than concrete core sample top surface；
The concrete corrosion case for being loaded with concrete core sample and sulfate attack liquid is placed in inside cryogenic box；
Anode and water-absorbing sponge are placed in concrete core sample drilling, cathode immerses in sulfate attack liquid, and by pulse generation
Device is connect with anode and cathode provides unidirectional pulse electric current；
Start cryogenic box to the sulfate attack under concrete core sample progress low temperature；
The concrete core sample corroded that will be powered takes out, and terminates the electrochemical parameter for being powered and testing concrete core sample.
5. solid concrete low-temperature resistance sulfate attack performance test methods as described in claim 4, which is characterized in that mixed
Drilling depth is 18~20mm at the top of solidifying core sample, and aperture is 18~20mm.
6. solid concrete low-temperature resistance sulfate attack performance test methods as described in claim 4, which is characterized in that apply
The pulse current added is voltage 10V~40V, the unidirectional pulse direct current of 10~30s of pulse frequency.
7. solid concrete low-temperature resistance sulfate attack performance test methods as described in claim 4, which is characterized in that sulphur
The liquid level of hydrochlorate etchant is lower than concrete core sample top surface 5mm.
8. solid concrete low-temperature resistance sulfate attack performance test methods as described in claim 4, which is characterized in that institute
It states concrete core sample and is powered and corrode 1 month~3 months.
9. solid concrete low-temperature resistance sulfate attack performance test methods as described in claim 4, which is characterized in that institute
Stating electrochemical parameter is transient state resistance and AC impedance, and the measurement of the electrochemical parameter specifically includes following steps, energization is invaded
Concrete core sample after erosion takes out；Concrete core sample bore surfaces connecting test instrument anode, another rounded face connecting test
Instrument cathode；The transient state resistance and AC impedance for testing concrete core sample are for several times；Obtained transient state resistance and AC impedance are surveyed
Test result is averaged respectively as last test data, and with corrode before concrete core sample transient state resistance and exchange resistance
It is anti-to compare.
10. the solid concrete low-temperature resistance sulfate attack performance test methods as described in any one of claim 4~9,
It is characterized in that, using such as claim 1 solid concrete low-temperature resistance sulfate attack performance testing device.
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| CN201910368670.1A CN110044811B (en) | 2019-05-05 | 2019-05-05 | Device and method for testing low-temperature sulfate corrosion resistance of solid concrete |
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| CN201910368670.1A CN110044811B (en) | 2019-05-05 | 2019-05-05 | Device and method for testing low-temperature sulfate corrosion resistance of solid concrete |
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| CN110044811B CN110044811B (en) | 2021-11-30 |
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| CN112179836A (en) * | 2020-09-29 | 2021-01-05 | 河海大学 | Accelerated test device for researching concrete performance degradation under sulfate erosion |
| CN114002273A (en) * | 2021-10-29 | 2022-02-01 | 河海大学 | Concrete degradation process monitoring device and monitoring method thereof |
| CN115679234A (en) * | 2022-11-30 | 2023-02-03 | 昆明理工大学 | Method for improving wear resistance and corrosion resistance of zirconium-based amorphous alloy |
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| CN114002273A (en) * | 2021-10-29 | 2022-02-01 | 河海大学 | Concrete degradation process monitoring device and monitoring method thereof |
| CN115679234A (en) * | 2022-11-30 | 2023-02-03 | 昆明理工大学 | Method for improving wear resistance and corrosion resistance of zirconium-based amorphous alloy |
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| Publication number | Publication date |
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| CN110044811B (en) | 2021-11-30 |
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