CN107894462A - A kind of method of testing of concrete parts carbonizing zone depth - Google Patents
A kind of method of testing of concrete parts carbonizing zone depth Download PDFInfo
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- CN107894462A CN107894462A CN201711096757.5A CN201711096757A CN107894462A CN 107894462 A CN107894462 A CN 107894462A CN 201711096757 A CN201711096757 A CN 201711096757A CN 107894462 A CN107894462 A CN 107894462A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
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Abstract
The present invention discloses a kind of method of testing of concrete parts carbonizing zone depth, comprises the following steps：Step 1, formation of concrete test specimen, carbonization treatment after form removal maintenance；Step 2, the acoustic velocity value of test specimen is obtained by ultrasonic tesint；Step 3, the partial carbonization zone depth of test specimen is measured using thermogravimetry；Step 4, the acoustic velocity value to acquisition and partial carbonization zone depth value are fitted, and draw the relation between acoustic velocity value and partial carbonization zone depth, and the partial carbonization zone depth of corresponding concrete is obtained subsequently through the acoustic velocity value of test test specimen.This method is by establishing the fit correlation between concrete parts carbonizing zone depth and the ultrasonic velocity of concrete, can be under conditions of test specimen not be destroyed, ultrasonic velocity only need to be tested, the partial carbonization zone depth of corresponding concrete can be obtained, test process ensure that the integrality of sample, while avoid the introduced damage of splitting test specimen；Moreover, this method test result is accurate, and method of testing is more succinct economical.
Description
Technical field
The present invention relates to a kind of concrete carbonization depth method of testing, and in particular to a kind of concrete parts carbonizing zone depth
Method of testing, belong to construction material detection field.
Background technology
Concrete has been widely used in building field as a kind of economic construction material.Concrete meeting after preparation
The hydration reaction of cement internally occurs, after hydrated cementitious terminates, certain hole can be internally formed in Behavior of Hardened Cement Paste.This some holes
Gap becomes CO2The passage being carbonized into inside concrete, shown in carbonation reaction such as formula (1)~(4).
Ca(OH)2+CO2→CaCO3+H2O (1)
(3CaO·2SiO2·3H2O)+3CO2→(3CaCO3·2SiO2·3H2O) (2)
(2CaO·SiO2)+2CO2+nH2O→(SiO2·nH2O)+2CaCO3 (3)
(3CaO·SiO2)+3CO2+nH2O→(SiO2·nH2O)+3CaCO3 (4)
Concrete is after carbonization, hydrated product Ca (OH)2(molal volume：33.2cm3/ mol) it is gradually converted into CaCO3
(molal volume：36.9cm3/ mol), it is filled in hole, molal volume adds about 11%, and then makes in concrete
Portion gradually becomes more closely knit.Not only CH is carbonized in Behavior of Hardened Cement Paste, and C-S-H (C-S-H accounts for more than the 60% of Behavior of Hardened Cement Paste) also can
Carbonization.The former primarily forms calcite, and the latter primarily forms cloud tints stone and vaterite.But cloud tints stone and vaterite are unstable, can convert
For calcite.CaCO3Crystal has three kinds of forms：Calcite, cloud tints stone and vaterite, the density of three kinds of crystal formations are different.So carbonization
Volume Changes afterwards are in 10-20% ranges.
But the armored concrete after being carbonized, the phenomenon of steel bar corrosion is still suffered from the region of phenolphthalein reagent discoloration, directly
Some extreme position in color change interval is reached to depth.Because the influence of partial carbonization zone, i.e. concrete are from outward appearance to inner essence
3 carbonization area, partial carbonization zone and non-carbonizing zone regions can be divided into.Ca (OH) in partial carbonization zone2Content by table
And inner gradually increase, CaCO3Content gradually decrease；Simultaneously because the consumption of alkaline matter, the pH value of concrete is in part carbon
Change and also gradually risen in area.The pH value of non-carbonizing zone concrete is about 12.5 or so, and the pH value of carbonization area concrete is
8.5, the pH value of partial carbonization zone falls between and (is increased to 12.5 from 8.5 from outside to inside).Carburizing reagent in concrete
Material changing rule is not fully consistent with the pH changing rules of concrete carbonization, and the scope of concrete parts carbonization should be by coagulation
The scope that carburizing reagent material changes in soil is determined, rather than is confined to carry out in the region of pH value change.So work as coagulation
Still there can be a certain amount of alkaline reserve when hole solution is carbonized in soil, in slurry not to be carbonized, i.e. the carbonization of hole solution and slurry
The carbonization of body is not necessarily synchronous.Therefore, when defining the carbonization subregion of concrete, the result of the test to change from material is gone
The scope of analysis part carbonizing zone.
The method of part of detecting carbonizing zone has infrared spectrum analysis, thermogravimetric analysis, X-ray analysis, gamma-rays analysis at present
Method, above method of testing is complex, and costly.Therefore, need badly and provide a set of method of testing easy and economic test
Method.
Main method of the ultrasonic method as non-damaged test method, quality control and existing structure for new construction
Long-term use of state estimation has the function that more important.Ultrasonic method is according to ultrasonic propagation velocity and concrete elastic property
Relation, reflect the quality of inside concrete.It is currently used primarily in Crack Detection and intensity detection of inside concrete etc..Answered
For testing the partial carbonization zone depth of concrete, both concrete can be made to avoid nonessential breakage in test process, again
Test process simple and fast can be made.Above all ultrasonic method is more more economical than current existing partial carbonization zone method of testing.
But the relevant report that ultrasonic detection technology is used for part of detecting carbonizing zone depth is had no at present.
The content of the invention
Goal of the invention：For existing concrete parts carbonizing zone depth test method it is complicated and costly the problem of,
The present invention provides a kind of method of testing of concrete parts carbonizing zone depth, and this method is by by partial carbonization zone depth and ultrasound
Spread speed of the ripple in carbonated concrete establishes fit correlation, and the partial carbonization zone that can conveniently and efficiently calculate concrete is deep
Degree.
Technical scheme：A kind of method of testing of concrete parts carbonizing zone depth of the present invention, comprises the following steps：
Step 1, formation of concrete test specimen, it is carbonized after form removal maintenance；
Step 2, ultrasonic tesint is carried out to test specimen, obtains the acoustic velocity value of test specimen；
Step 3, the partial carbonization zone depth of test specimen is measured using thermogravimetry；
Step 4, the acoustic velocity value to acquisition and partial carbonization zone depth value are fitted analysis, draw acoustic velocity value and part carbon
Change the relation between area's depth, the partial carbonization zone depth of corresponding concrete is obtained subsequently through the acoustic velocity value of test test specimen.
In above-mentioned steps 1, the test specimen after shaping preferably conserves in the environment of temperature is 20 DEG C, relative humidity is 70%
It is stripped after 24h, is preferably placed into after the demoulding in the fog room that temperature is 20 ± 3 DEG C, relative humidity is 90% and continue to conserve 28d.
Then the test specimen after maintenance is put into carbonization case and carries out carbonization test, be carbonized the distance between each test specimen in case
Preferably not less than 50mm.After carbonization test starts, preferably to temperature, humidity and the CO in carbonization case2Concentration carries out results of regular determination simultaneously
Regulation in time, meet in carbonization case environment claimed below：Temperature is 5~40 DEG C, and relative humidity is 25~75%, CO2Concentration
For 0.03%~100%.Preferably can after carbonization test starts first 2 days every 2h determine a case in temperature, humidity and CO2
Concentration, later measure every 4h once.
In above-mentioned steps 2, ultrasonic tesint comprises the steps：Ultrasonic measuring point is indicated on test specimen and measures supersonic sounding,
Then test ultrasonic wave at each measuring point and pass through the time of test specimen, the acoustic velocity value of calculation testing piece；When indicating ultrasonic measuring point, need to ensure
Each ultrasonic measuring point is evenly distributed on the test surfaces of test specimen.
When carrying out ultrasonic tesint, couplant can be added, couplant is preferably one kind of vaseline or dextrin.
The acoustic velocity value for the test specimen that ultrasonic tesint obtains is the bulk sound velocity value of different measuring points, and the value can determine according to following formula：
In formula：V be test specimen acoustic velocity value, liFor the supersonic sounding of i-th of measuring point, i=1,2 ... n, n >=3；ti-t0For
I measuring point ultrasonic wave by time of test specimen, wherein, tiFor reading, t during sound in i-th of measuring point concrete0For sound when initial reading.
In above-mentioned parameter, v unit is km/s, can preferably be accurate to 0.01km/s；liUnit be mm, 1mm can be accurate to；ti、t0's
Unit is us, can be accurate to 0.1us.
To make test result further refine, when measuring supersonic sounding, the supersonic sounding value l of i-th of measuring pointiPreferably take
At least 3 points of average value near the measuring point.
In above-mentioned steps 3, the method using thermogravimetry part of detecting carbonizing zone depth is specially：First test specimen is broken
Type, then take the sample of different depth that powder is made and test its composition, according to the depth of test result calculations partial carbonization zone.This
In step, type can be broken since test specimen one end by dry sawing, take a sample that powder is made every 5mm on test specimen depth direction
End test composition, so as to obtain more accurate test result.
Inventive principle：Concrete can form substantial amounts of hole, CO after hydrated cementitious terminates2Coagulation is entered by hole
Native inside is carbonized, and with the raising of concrete carbonization degree, inside concrete gradually becomes more closely knit；Ultrasonic wave is in coagulation
The quality of spread speed and inside concrete in soil has close relationship, and internal more closely knit, spread speed is faster；By big
The test data of amount, it can be deduced that the relation between ultrasonic velocity and partial carbonization zone depth, then can be super by testing
The sound wave velocity of sound is inferred to the partial carbonization zone depth of concrete, evaluates the carbonizing degree of concrete.
Beneficial effect：Compared with prior art, the advantage of the invention is that：The concrete parts carbonizing zone depth of the present invention
Method of testing establishes concrete parts carbonizing zone depth test curve based on ultrasonic method, can under conditions of test specimen is not destroyed,
Ultrasonic velocity only need to be tested, you can detect the depth of concrete parts carbonizing zone, test process ensure that the complete of sample
Property, while avoid the introduced damage of splitting test specimen；Moreover, this method test result is accurate, and method of testing more succinctly passes through
Ji.
Brief description of the drawings
Relations of the Fig. 1 between concrete ultrasonic velocity and partial carbonization zone depth.
Embodiment
Technical scheme is described further below in conjunction with the accompanying drawings.
The method of testing of a kind of concrete parts carbonizing zone depth of the present invention, by establishing concrete parts carbonizing zone depth
Fit correlation between degree and the ultrasonic velocity of concrete, only it can need to test ultrasonic wave under conditions of test specimen is not destroyed
The velocity of sound, you can obtain the partial carbonization zone depth of corresponding concrete.
Specifically, a kind of concrete carbonization depth method of testing of the invention is rubbed according to inside concrete after carbonization
You evaluate carbonation depth at Volume Changes indirectly, by testing spread speed of the ultrasonic wave in concrete, and then evaluate coagulation
Compactness after soil carbonization, so as to rating unit carbonizing zone depth.This method conveniently tests ultrasonic wave by ultrasonic method
Spread speed in carbonated concrete, according to fitting formula, calculate the partial carbonization zone depth of concrete；In non-breakage side
In method, this method is convenient and swift, and cost is low.
Embodiment 1
A kind of method of testing of concrete parts carbonizing zone depth, comprises the following steps：
Step 1, specimen molding and carbonization：C20, C30, C40 and C50 concrete sample are molded according to set match ratio,
Carbonization case carbonization is put into after form removal maintenance 28d, the temperature for the case that is carbonized is 20 ± 2 DEG C, relative humidity 70%, CO2Concentration is 20
± 2%；
Step 2, ultrasonic tesint：After ultrasonic measuring point is indicated on test specimen and measures supersonic sounding, test ultrasonic wave passes through examination
The time of part, according to the acoustic velocity value of the time calculation testing piece；
Step 3, thermogravimetric analysis is tested：Test specimen is broken into type, takes a sample that powder is made every 5mm on test specimen depth direction
Thermogravimetric analysis is done at end, obtains the partial carbonization zone depth d of the test specimenp；
Step 4, the partial carbonization zone depth d drawn by the ultrasonic velocity value v drawn to step 2 with step 3pCarry out
Fitting Analysis, relation between the two, such as Fig. 1 are established, finally draws v and dpBetween correlation formula：
dp=(2E+27) v-38.92
The regression coefficient R of this formula2=0.9903.
Know v and dpBetween relation after, the acoustic velocity value v by testing test specimen can obtain the part carbon of corresponding concrete
Change area depth dp。
Above regression formula coefficient correlation illustrates the validity of the present embodiment with Fig. 1, also show concrete parts carbon
Change the feasibility of the method for testing of area's depth.
Claims (10)
1. a kind of method of testing of concrete parts carbonizing zone depth, it is characterised in that comprise the following steps：
Step 1, formation of concrete test specimen, it is carbonized after form removal maintenance；
Step 2, ultrasonic tesint is carried out to test specimen, obtains the acoustic velocity value of test specimen；
Step 3, the partial carbonization zone depth of test specimen is measured using thermogravimetry；
Step 4, the acoustic velocity value to acquisition and partial carbonization zone depth value are fitted analysis, draw acoustic velocity value and partial carbonization zone
Relation between depth, the partial carbonization zone depth of corresponding concrete is obtained subsequently through the acoustic velocity value of test test specimen.
2. the method for testing of concrete parts carbonizing zone according to claim 1, it is characterised in that in step 1, after shaping
Test specimen be stripped after 24h is conserved in the environment of temperature is 20 DEG C, relative humidity is 70%, temperature is put into after the demoulding as 20 ± 3
DEG C, relative humidity be 90% fog room in continue conserve 28d.
3. the method for testing of concrete parts carbonizing zone according to claim 1, it is characterised in that in step 1, will conserve
Test specimen afterwards is put into carbonization case and carries out carbonization test, and the distance between each test specimen in case that is carbonized is not less than 50mm.
4. the method for testing of concrete parts carbonizing zone according to claim 3, it is characterised in that the carbonization test is opened
To temperature, humidity and the CO in carbonization case after beginning2Concentration results of regular determination and adjust in time, make in carbonization case environment satisfaction with
Lower requirement：Temperature is 5~40 DEG C, and relative humidity is 25~75%, CO2Concentration is 0.03%~100%.
5. the method for testing of concrete parts carbonizing zone according to claim 3, it is characterised in that the carbonization test is opened
After beginning, temperature, humidity and CO in a case are determined every 2h within first 2 days2Concentration, later measure every 4h once.
6. the method for testing of concrete parts carbonizing zone according to claim 1, it is characterised in that described super in step 2
Sound test comprises the steps：Ultrasonic measuring point is indicated on test specimen and measures supersonic sounding, is then tested ultrasonic at each measuring point
Ripple passes through the time of test specimen, the acoustic velocity value of calculation testing piece；Wherein, the ultrasonic measuring point is evenly distributed on the test surfaces of test specimen.
7. the method for testing of concrete parts carbonizing zone according to claim 6, it is characterised in that the velocity of sound of the test specimen
It is worth the bulk sound velocity value for different measuring points, the value determines according to following formula：
<mrow>
<mi>v</mi>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mi>n</mi>
</mfrac>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>n</mi>
</munderover>
<mfrac>
<msub>
<mi>l</mi>
<mi>i</mi>
</msub>
<mrow>
<msub>
<mi>t</mi>
<mi>i</mi>
</msub>
<mo>-</mo>
<msub>
<mi>t</mi>
<mn>0</mn>
</msub>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
In formula：V be test specimen acoustic velocity value, liFor the supersonic sounding of i-th of measuring point, i=1,2 ... n, n >=3；ti-t0For i-th
Measuring point ultrasonic wave by time of test specimen, wherein, tiFor reading, t during sound in i-th of measuring point concrete0For sound when initial reading.
8. the method for testing of concrete parts carbonizing zone according to claim 7, it is characterised in that i-th of measuring point
Supersonic sounding value liTake at least 3 points near the measuring point of average value.
9. the method for testing of concrete parts carbonizing zone according to claim 1, it is characterised in that described to adopt in step 3
Comprised the steps with thermogravimetry part of detecting carbonizing zone depth：Test specimen is broken into type, takes the sample of different depth that powder is made
Its composition is tested at end, according to test result calculations partial carbonization zone depth.
10. the method for testing of concrete parts carbonizing zone according to claim 9, it is characterised in that the test specimen breaks type
It is that type is broken since test specimen one end by dry sawing, takes a sample that powder test is made every 5mm on test specimen depth direction
Composition.
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Cited By (4)
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|---|---|---|---|---|
| CN111398347A (en) * | 2020-03-02 | 2020-07-10 | 武汉理工大学 | Device and method for measuring temperature rise of carbonization reaction |
| CN111398428A (en) * | 2020-03-02 | 2020-07-10 | 武汉理工大学 | Testing method and device for in-situ monitoring of strength development of carbonized product |
| CN112213362A (en) * | 2020-09-22 | 2021-01-12 | 东南大学 | Cement solidified soil carbonization depth testing method based on resistivity method |
| CN113916874A (en) * | 2021-09-29 | 2022-01-11 | 西安理工大学 | High-precision measuring method for concrete dam carbonization depth full life cycle |
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| CN113916874B (en) * | 2021-09-29 | 2023-10-03 | 西安理工大学 | High-precision measuring method for full life cycle of concrete dam carbonization depth |
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