CN103698259A - Method for testing sulfate radical erosion depth of cement-based material - Google Patents
Method for testing sulfate radical erosion depth of cement-based material Download PDFInfo
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- CN103698259A CN103698259A CN201310693920.1A CN201310693920A CN103698259A CN 103698259 A CN103698259 A CN 103698259A CN 201310693920 A CN201310693920 A CN 201310693920A CN 103698259 A CN103698259 A CN 103698259A
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Abstract
The invention provides a method for testing the sulfate radical erosion depth of a cement-based material. The method is used for carrying out the full-course conservation and the sulfate radical penetration test on the cement material by a mould for the on-line test of electrochemical impedance spectroscopy during hydration of cement disclosed by the patent with the number of 'ZL201120473976.2'. The method comprises the following steps: enabling the cement material to be eroded by sulfate radical by disassembling 40mm*40mm plate electrodes from two ends of the mould when the sulfate radical penetrates, and assembling the plate electrodes onto the two ends of the mould when the electrochemical impendence spectroscopy test needs to be carried out, wherein the sulfate radical erosion depth of the cement material can be reflected and calculated through the regular change of electrochemistry parameters. The method has the advantages that the mould and cement test pieces are less prone to damage, and the test can be repeatedly carried out, has few errors, is convenient to operate, etc.
Description
Technical field
The invention belongs to cement material penetration testing method field, relate in particular to a kind of cement-based material sulfate radical depth of erosion method of testing.
Background technology
The shortcoming of the barium nitrate reagent method of existing traditional test sulfate radical length of penetration is:
(1) cement specimen in mould need to be taken apart, this is easy to cause the damage of mould, and also unusual inconvenience in actual mechanical process, and cement specimen can not repeat to accept to corrode and test.
(2) need to destroy test specimen, after testing, often will repair member, the method is to the damage of member or even can not repair sometimes.
(3) can not repeatability detect, the method can produce and destroy cement specimen, even if member is repaired, the infiltration process in its later stage also can be affected, so the length of penetration of again measuring is inaccurate.
(4) error is large, and the method when test adopts artificial gage to measure, and often occurs misoperation or visual fatigue and causes very large reading error.
(5) inconvenient operation, the workload of the method is very large, in batch detection, often needs a large amount of manpowers and time.
Summary of the invention
The object of the present invention is to provide a kind of cement-based material sulfate radical depth of erosion method of testing, be intended to solve in existing method of testing mould and cement specimen is fragile, can not repeatability detect, error is large and the problem such as inconvenient operation.
The present invention is achieved in that a kind of cement-based material sulfate radical depth of erosion method of testing, comprises the following steps:
It is that the disclosed mould of ZL201120473976.2 carries out removal both mold ends battery lead plate after cement test piece maintenance and the sulfate radical solution that mould is placed in different sulfate concentrations is permeated that composite Portland cement is injected to the patent No.;
At different time of penetration points, get the measurement of carrying out True Depth of Penetration value after part of cement test specimen splits out from mould;
After residue being split out to the good two end electrodes plate of die assembly of cement specimen of measurement, do not carry out impedance spectrum test and obtain each impedance spectrogram, described each impedance spectrogram electricity consumption chemical model is carried out to matching and obtain actual electrical chemical parameters value, according to described True Depth of Penetration value and actual electrical chemical parameters value, simulate the funtcional relationship between penetration depth value and electrochemical parameter value;
According to the water cement ratio of cement specimen and time of penetration point, calculate prediction electrochemical parameter value, and obtain predicting penetration depth value according to described funtcional relationship.
Preferably, the water cement ratio of described cement specimen is respectively 0.25,0.3,0.4 and 0.5.
Preferably, described two end electrodes plate is the battery lead plate of two ends 40mm * 40mm that in the disclosed patent document of patent No. ZL201120473976.2, the 0030th section of part of embodiment recorded.
Preferably, in different described sulfate radical solution, sulfate concentration is respectively 300mg/L, 3000mg/L and 6000mg/L.
Preferably, described time of penetration point is respectively 0 day, 15 days, 30 days, 60 days, 90 days, 120 days, 150 days, 210 days and 270 days.
Preferably, describedly at different time of penetration points, get the measurement of carrying out True Depth of Penetration value after part of cement test specimen splits out from mould and comprise following concrete steps:
Prepare the cement specimen of 3 the same terms maintenances, described cement specimen is taken out to cleave in two from mould, scrape off powder remaining on section, coat immediately the dilute nitric acid solution that concentration is 1mol/L, after its reaction, coat again the liquor argenti nitratis ophthalmicus of 0.05mol/L, after 30 seconds, by every 5 millimeters of measurement points, measure respectively the penetration depth value of each cement specimen two sides each point;
Described in each, 7 measurement points are got respectively in side, calculate the average penetration depth value of each each side of cement specimen, finally according to the average penetration depth value of side described in each, calculate the population mean of the penetration depth value of 3 cement specimens, choosing this population mean is True Depth of Penetration value.
Preferably, described impedance spectrogram comprises Nyquist figure and Bode figure.
Preferably, described galvanochemistry model is: R
s(Q
1(R
ct1w
1)) (Q
2(R
ct2w
2)); Wherein,
R
sfor cement sample resistance of pore solution, Q
1for the electric double layer capacitance of cement material inside solid-liquid two-phase, R
ct1for the ion transport process resistance of cement material inside, W
1for the ion diffusion process resistance of cement material inside, Q
2for the electric double layer capacitance between cement material and battery lead plate, R
ct2for the charge transfer process resistance of electrode plate surface, W
2ion diffusion process resistance for electrode plate surface.
Preferably, the funtcional relationship between described penetration depth value and electrochemical parameter value is defined as: R
ct1=aD
b; Wherein, D is penetration depth value, R
ct1for electrochemical parameter value, a, b are constant.
Preferably, described prediction electrochemical parameter value and time of penetration point are exponential function relation.
The present invention overcomes the deficiencies in the prior art, a kind of cement-based material sulfate radical depth of erosion method of testing is provided, and the method is that " ZL 2,011 2 0473976.2 ", name are called " a kind of cement hydration process electrochemical impedance spectroscopy on-line testing mould " disclosed a kind of mould for the on-line testing of cement hydration process electrochemical impedance spectroscopy cement material is carried out to omnidistance maintenance and sulfate radical penetration testing by adopting the patent No..First with this mould preparation and curing water mud material, two ends 40mm * 40mm battery lead plate is laid down in maintenance after 28 days, allow cement material accept sulfate radical and corrode, in the time of need to testing, again both mold ends is loaded onto to battery lead plate and can be carried out electrochemical impedance spectroscopy test, thus the erosion process of following the tracks of cement material.Whole process cement in mould, is not damaged always, thereby has realized non-destructive testing.Due to detachable dress of battery lead plate of both mold ends, so cement material can repeat accept to corrode and test, has realized repeated test.Removing and installing of mould also makes convenient test feasible freely.
In addition, the present invention relates to the test of cement-based material electrochemical system to the test of cement material sulfate radical length of penetration, owing to forming the parameter variation of Development pattern along with the process corroding again of the element of galvanochemistry model, the mathematical connection that exists with sulfate radical length of penetration, therefore by the galvanochemistry model with suitable, represent the cement material under erosion action, by the rule of electrochemical parameter, change to reflect and calculate the sulfate radical length of penetration of cement material, so not only avoid manually depending on reading length of penetration, producing larger reading error, and can save a large amount of test manpower and time.Electrochemical impedance spectral method can Efficient Characterization cement material micromechanism, highly sensitive, favorable repeatability, the test duration is short and be nondestructive test, is a kind of method fast and effectively of studying cement-based material structure and performance.Electrochemical impedance spectroscopy is effectively responsive for interface between the research structural change of cement-based material and slurry and aggregate, and cement, mortar, and the materials such as concrete, along with the carrying out structure and can become fine and close of ion erosion, cause that significantly changing appears in its impedance spectrogram.With a galvanochemistry equivalent-circuit model R
s(Q
1(R
ct1w
1)) (Q
2(R
ct2w
2)) can characterize the ion erosion process of cement-based material.This circuit is not used when test, while being only fitting data, uses, and be for characterizing the sulfate radical erosion process of cement-based material.This model is comprised of following parameter: R
sfor cement sample resistance of pore solution, Q
1for the electric double layer capacitance of cement material inside solid-liquid two-phase, R
ct1for the ion transport process resistance of cement material inside, W
1for the ion diffusion process resistance (Warburg resistance) of cement material inside, Q
2for the electric double layer capacitance between cement material and battery lead plate, R
ct2for the charge transfer process resistance of electrode plate surface, W
2ion diffusion process resistance (Warburg resistance) for electrode plate surface.Model R
s(Q
1(R
ct1w
1)) (Q
2(R
ct2w
2)) journey not only considers the effect of test process peripheral battery lead plate reaction, the solid-liquid of also having considered cement material inside interacts, it is the electric double layer capacitance effect between solid-liquid, ion diffusion process in hole solution and the ion transport process of sample interior, so by the effective ion erosion process of tracking and testing cement-based material of this model.
Accompanying drawing explanation
Fig. 1 is that the cement specimen of 0.3 water cement ratio in the embodiment of the present invention 1 soaks the Nyquist figure of 150 days at sulfate concentration 6000mg/L;
Fig. 2 is that the cement specimen of 0.3 water cement ratio in the embodiment of the present invention 1 soaks the Bode figure of 150 days at sulfate concentration 6000mg/L;
Fig. 3 is that the cement specimen of 0.4 water cement ratio in the embodiment of the present invention 2 soaks the Nyquist figure of 15 days at sulfate concentration 6000mg/L;
Fig. 4 is that the cement specimen that in the embodiment of the present invention 2, water cement ratio is 0.4 soaks the bode figure of 15 days at sulfate concentration 6000mg/L.
Embodiment
Technical scheme provided by the present invention is: the hardened cement material test block after corroding is carried out to impedance spectrum test, obtain impedance spectrogram; Utilize the electrochemical circuit models fitting impedance spectrogram of cement material, obtain electrochemical parameter, the then actual sulfate radical length of penetration of test water mud material; Electrochemical parameter and True Depth of Penetration are set up to funtcional relationship, then extrapolate cement material later stage length of penetration by calculating electrochemical parameter, thereby complete the test of later stage cement material length of penetration.
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Embodiment 1
A cement-based material sulfate radical depth of erosion method of testing, comprises following concrete steps:
(1) composite Portland cement being injected to the patent No. is that the disclosed mould of ZL201120473976.2 carries out removal both mold ends battery lead plate after cement test piece maintenance and the sulfate radical solution that mould is placed in different sulfate concentrations is permeated.
In step (1), it is that (refer to the 3rd page of disclosed mould for the on-line testing of cement hydration process electrochemical impedance spectroscopy of embodiment of this patent document instructions part, the model specification of this mould has specific descriptions 0030 section of embodiment to the disclosed mould of ZL201120473976.2: " base plate 1, side plate 2 and cover plate 5 materials are organic polymers of high insulation that 525 composite Portland cements that starfish little Ye field, Shenzhen Cement Co., Ltd is produced inject the patent No..The base plate 1 of high insulation organic polymer, side plate 2 and the common cavity that forms 40 millimeters * 40 millimeters * 160 millimeters of stainless steel 3, for moulding sample and on-line testing.") in; until the cement specimen in this mould, carry out 40 millimeters * 40 millimeters, the two ends battery lead plate of maintenance removal mould after 28 days; wherein; the water cement ratio of the cement specimen forming in mould is respectively 0.25,0.3,0.4 and 0.5; the cement specimen of every kind of water cement ratio is prepared 24 test specimens, and test block is of a size of 160mm * 40mm * 40mm.
The mould that will unload two ends 40mm * 40mm battery lead plates immerses and corrodes in case together with the cement specimen in mould, and in this erosion case, being respectively equipped with sulfate concentration is the sulfate radical solution of 300mg/L, 3000mg/L, 6000mg/L.
(2) at different time of penetration points, get the measurement of carrying out True Depth of Penetration value after part of cement test specimen splits out from mould.
In step (2), in process of osmosis, when each time of penetration point (0 day, 15 days, 30 days, 60 days, 90 days, 120 days, 150 days, 210 days and 270 days), respectively get the test specimen of 3 the same terms maintenances, test specimen is taken out from mould, longitudinally cleave in two, scrapes off powder remaining on section, coats immediately the dilute nitric acid solution that concentration is 1mol/L, after its reaction, coat the liquor argenti nitratis ophthalmicus of 0.05mol/L.After 30 seconds, every 5 millimeters of measurement points drawing by original mark are measured respectively the length of penetration of two sides each point with vernier caliper.Every side has 7 measurement points, by following formula, averages, and is accurate to 0.01 millimeter:
Dx=(D1+D2+D3+D4+D5+D6+D7)/7
Wherein, Dx is the average length of penetration of the every side of current cement specimen, D
1to D
7for measuring point length of penetration.
Get the population mean of length of penetration of above-mentioned 3 cement specimens as the True Depth of Penetration value of a certain time of penetration point, for example, the True Depth of Penetration value of the cement specimen of 0.3 water cement ratio in 6000mg/L sulfate radical solution when time of penetration point is 0,15 and 30 day is as shown in table 1 below:
Table 1
(3) carry out impedance spectrum test after residue not being split out to the good two end electrodes plate of die assembly of cement specimen of measurement, draw each impedance spectrogram, described each impedance spectrogram electricity consumption chemical model is carried out to matching and obtain actual electrical chemical parameters value, according to described True Depth of Penetration value and actual electrical chemical parameters value, simulate the funtcional relationship between penetration depth value and electrochemical parameter value.
In step (3), when each time of penetration point (0 day, 15 days, 30 days, 60 days, 90 days, 120 days, 150 days, 210 days and 270 days), respectively getting other cement specimens that do not split out from mould carries out impedance spectrum test (carrying out before impedance spectrum test by two 40mm * 40mm battery lead plates of removal be again contained in both mold ends) and draws each impedance spectrogram, for example, as illustrated in fig. 1 and 2, Fig. 1 is that the cement specimen of 0.3 water cement ratio in the embodiment of the present invention 1 soaks the Nyquist figure of 150 days at sulfate concentration 6000mg/L; Fig. 2 is that the cement specimen of 0.3 water cement ratio in the embodiment of the present invention 1 soaks the Bode figure of 150 days at sulfate concentration 6000mg/L.In the present embodiment, the electrochemical impedance spectroscopy tester adopting is 283 constant potentials/galvanostat, 2000 type frequency response detectors, input signal Si ngle powersine, battery lead plate is Model283at address14, test frequency is 100.0mHz-1.000MHz.
By impedance spectrogram electricity consumption chemical model R described in each
s(Q
1(R
ct1w
1)) (Q
2(R
ct2w
2)) carry out matching (using software Zsimpwin to carry out matching), wherein, R
sfor cement sample resistance of pore solution, Q
1for the electric double layer capacitance of cement material inside solid-liquid two-phase, R
ct1for the ion transport process resistance of cement material inside, W
1for the ion diffusion process resistance of cement material inside, Q
2for the electric double layer capacitance between cement material and battery lead plate, R
ct2for the charge transfer process resistance of electrode plate surface, W
2ion diffusion process resistance for electrode plate surface.
After matching, obtain the actual electrical chemical parameters value R of 0 day, 15 days, 30 days, 60 days, 90 days, 120 days, 150 days, 210 days and 270 days
ct1value, for example, the cement specimen of 0.3 water cement ratio in 6000mg/L sulfate radical solution is at the actual electrical chemical parameters value R of 0 day, 15 days and 30 days
ct1value as shown in table 2:
Table 2
The funtcional relationship simulating between penetration depth value and electrochemical parameter value according to the actual electrical chemical parameters value obtaining in the True Depth of Penetration value obtaining in step (2) and step (3) is matching sulfate radical length of penetration D and parameters R
ct1the relation of value, for example, for the cement specimen of water cement ratio 0.3, the funtcional relationship between penetration depth value and electrochemical parameter value is defined as: R
ct1=aD
b(constant a, b and soaking solution sulfate concentration, water cement ratio, curing age, cement type is relevant).
(4) according to the water cement ratio of cement specimen and time of penetration point, calculate prediction electrochemical parameter value, and obtain predicting penetration depth value according to described funtcional relationship.
In step (4), due to parameters R
ct1value and in time T meet exponential function relation, and for the cement specimen of water cement ratio 0.3, its funtcional relationship is:
For example, calculate thus 150 days and parameters R that 270 days sulfate radicals corrode
ct1be worth as shown in table 3:
Table 3
Calculating prediction electrochemical parameter R
ct1value, just can pass through function R
ct1=aD
bcalculate the prediction penetration depth value D of sulfate radical in the cement specimen also not splitting out in mould, thereby realize the non-destructive testing of length of penetration, result of calculation is as shown in table 4 below:
Table 4
| Corrode number of days | Prediction penetration depth value (mm) |
| (my god) | 0.3 water cement ratio |
| 150 | 20 |
| 270 | 22 |
Embodiment 2
A cement-based material sulfate radical depth of erosion method of testing, comprises following concrete steps:
(1) composite Portland cement being injected to the patent No. is that the disclosed mould of ZL 201120473976.2 carries out removal both mold ends battery lead plate after cement test piece maintenance and the sulfate radical solution that mould is placed in different sulfate concentrations is permeated.
In step (1), it is that (refer to the 3rd page of disclosed mould for the on-line testing of cement hydration process electrochemical impedance spectroscopy of embodiment of this patent document instructions part, the model specification of this mould has specific descriptions 0030 section of embodiment to the disclosed mould of ZL 201120473976.2: " base plate 1, side plate 2 and cover plate 5 materials are organic polymers of high insulation that 525 composite Portland cements that starfish little Ye field, Shenzhen Cement Co., Ltd is produced inject the patent No..The base plate 1 of high insulation organic polymer, side plate 2 and the common cavity that forms 40 millimeters * 40 millimeters * 160 millimeters of stainless steel 3, for moulding sample and on-line testing.") in; until the cement specimen in this mould, carry out 40 millimeters * 40 millimeters, the two ends battery lead plate of maintenance removal mould after 28 days; wherein; the water cement ratio of the cement specimen forming in mould is respectively 0.25,0.3,0.4 and 0.5; the cement specimen of every kind of water cement ratio is prepared 24 test specimens, and test block is of a size of 160mm * 40mm * 40mm.
The mould that will unload two ends 40mm * 40mm battery lead plates immerses and corrodes in case together with the cement specimen in mould, and in this erosion case, being respectively equipped with sulfate concentration is the sulfate radical solution of 300mg/L, 3000mg/L, 6000mg/L.
(2) at different time of penetration points, get the measurement of carrying out True Depth of Penetration value after part of cement test specimen splits out from mould.
In step (2), in process of osmosis, when each time of penetration point (0 day, 15 days, 30 days, 60 days, 90 days, 120 days, 150 days, 210 days and 270 days), respectively get the test specimen of 3 the same terms maintenances, test specimen is taken out from mould, longitudinally cleave in two, scrapes off powder remaining on section, coats immediately the dilute nitric acid solution that concentration is 1mol/L, after its reaction, coat the liquor argenti nitratis ophthalmicus of 0.05mol/L.After 30 seconds, every 5 millimeters of measurement points drawing by original mark are measured respectively the length of penetration of two sides each point with vernier caliper.Every side has 7 measurement points, by following formula, averages, and is accurate to 0.01 millimeter:
Dx=(D1+D2+D3+D4+D5+D6+D7)/7
Wherein, Dx is the average length of penetration of the every side of current cement specimen, D
1to D
7for measuring point length of penetration.
Get the population mean of length of penetration of above-mentioned 3 cement specimens as the True Depth of Penetration value of a certain time of penetration point, for example, the True Depth of Penetration value of the cement specimen of 0.4 water cement ratio in 6000mg/L sulfate radical solution when time of penetration point is 0,15 and 30 day is as shown in table 5 below:
Table 5
(3) carry out impedance spectrum test after residue not being split out to the good two end electrodes plate of die assembly of cement specimen of measurement, draw each impedance spectrogram, described each impedance spectrogram electricity consumption chemical model is carried out to matching and obtain actual electrical chemical parameters value, according to described True Depth of Penetration value and actual electrical chemical parameters value, simulate the funtcional relationship between penetration depth value and electrochemical parameter value.
In step (3), when each time of penetration point (0 day, 15 days, 30 days, 60 days, 90 days, 120 days, 150 days, 210 days and 270 days), respectively getting other cement specimens that do not split out from mould carries out impedance spectrum test (carrying out before impedance spectrum test by two 40mm * 40mm battery lead plates of removal be again contained in both mold ends) and draws each impedance spectrogram, as shown in Figures 3 and 4, wherein, Fig. 3 is that the cement specimen of 0.4 water cement ratio in the embodiment of the present invention 2 soaks the Nyquist figure of 15 days at sulfate concentration 6000mg/L; Fig. 4 is that the cement specimen that in the embodiment of the present invention 2, water cement ratio is 0.4 soaks the bode figure of 15 days at sulfate concentration 6000mg/L.In the present embodiment, the electrochemical impedance spectroscopy tester adopting is 283 constant potentials/galvanostat, 2000 type frequency response detectors, input signal Si ngle powersine, battery lead plate is Model283at address14, test frequency is 100.0mHz-1.000MHz.
By impedance spectrogram electricity consumption chemical model R described in each
s(Q
1(R
ct1w
1)) (Q
2(R
ct2w
2)) carry out matching (using software Zsimpwin to carry out matching), wherein, R
sfor cement sample resistance of pore solution, Q
1for the electric double layer capacitance of cement material inside solid-liquid two-phase, R
ct1for the ion transport process resistance of cement material inside, W
1for the ion diffusion process resistance of cement material inside, Q
2for the electric double layer capacitance between cement material and battery lead plate, R
ct2for the charge transfer process resistance of electrode plate surface, W
2ion diffusion process resistance for electrode plate surface.
After matching, obtain the actual electrical chemical parameters value R of 0 day, 15 days, 30 days, 60 days, 90 days, 120 days, 150 days, 210 days and 270 days
ct1value, for example, the cement specimen of 0.4 water cement ratio in 6000mg/L sulfate radical solution is at the actual electrical chemical parameters value R of 0 day, 15 days and 30 days
ct1value as shown in table 6:
Table 6
The funtcional relationship simulating between penetration depth value and electrochemical parameter value according to the actual electrical chemical parameters value obtaining in the True Depth of Penetration value obtaining in step (2) and step (3) is matching sulfate radical length of penetration D and parameters R
ct1the relation of value, for example, for the cement specimen of water cement ratio 0.4, the funtcional relationship between penetration depth value and electrochemical parameter value is defined as: R
ct1=aD
b(constant a, b and soaking solution sulfate concentration, water cement ratio, curing age, cement type is relevant).
(4) according to the water cement ratio of cement specimen and time of penetration point, calculate prediction electrochemical parameter value, and obtain predicting penetration depth value according to described funtcional relationship.
In step (4), due to parameters R
ct1value and in time T meet exponential function relation, and for the cement specimen of water cement ratio 0.4, its funtcional relationship is:
For example, calculate thus 150 days and parameters R that 270 days sulfate radicals corrode
ct1be worth as shown in table 7:
Table 7
Calculating prediction electrochemical parameter R
ct1value, just can pass through function R
ct1=aD
bcalculate the prediction penetration depth value D of sulfate radical in the cement specimen also not splitting out in mould, thereby realize the non-destructive testing of length of penetration, result of calculation is as shown in table 8 below:
Table 8
Compare the shortcoming and defect with prior art, the present invention has following beneficial effect:
(1) sulfate radical length of penetration test of the present invention can retain the integrality of cement specimen, is a kind of Non-Destructive Testing.
(2) method of testing of the present invention can realize the continuous real-time testing to sulfate radical length of penetration, can carry out repeated tracking detect infiltration process.
(3) the present invention utilizes the mathematical relation between electrochemical parameter and time, sulfate radical length of penetration, by the electrochemical parameter after test erosion action, calculate length of penetration, thereby can avoid the error of artificial reading, resulting data are more accurately and reliably.
(4) the present invention only need apply at test specimen two ends to the test of sulfate radical length of penetration the erosion process that electrode just can tracking and testing cement material, easy to operate.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a cement-based material sulfate radical depth of erosion method of testing, is characterized in that comprising the following steps:
It is that the disclosed mould of ZL201120473976.2 carries out removal both mold ends battery lead plate after cement test piece maintenance and the sulfate radical solution that mould is placed in different sulfate concentrations is permeated that composite Portland cement is injected to the patent No.;
At different time of penetration points, get the measurement of carrying out True Depth of Penetration value after part of cement test specimen splits out from mould;
After residue being split out to the good two end electrodes plate of die assembly of cement specimen of measurement, do not carry out impedance spectrum test and obtain each impedance spectrogram, described each impedance spectrogram electricity consumption chemical model is carried out to matching and obtain actual electrical chemical parameters value, according to described True Depth of Penetration value and actual electrical chemical parameters value, simulate the funtcional relationship between penetration depth value and electrochemical parameter value;
According to the water cement ratio of cement specimen and time of penetration point, calculate prediction electrochemical parameter value, and obtain predicting penetration depth value according to described funtcional relationship.
2. cement-based material sulfate radical depth of erosion method of testing as claimed in claim 1, is characterized in that, the water cement ratio of described cement specimen is respectively 0.25,0.3,0.4 and 0.5.
3. cement-based material sulfate radical depth of erosion method of testing as claimed in claim 2, it is characterized in that, described two end electrodes plate is the battery lead plate of two ends 40mm * 40mm that in the disclosed patent document of patent No. ZL201120473976.2, the 0030th section of part of embodiment recorded.
4. cement-based material sulfate radical depth of erosion method of testing as claimed in claim 3, is characterized in that, in different described sulfate radical solution, sulfate concentration is respectively 300mg/L, 3000mg/L and 6000mg/L.
5. cement-based material sulfate radical depth of erosion method of testing as claimed in claim 4, is characterized in that, described time of penetration point is respectively 0 day, 15 days, 30 days, 60 days, 90 days, 120 days, 150 days, 210 days and 270 days.
6. cement-based material sulfate radical depth of erosion method of testing as claimed in claim 5, is characterized in that, describedly at different time of penetration points, gets the measurement of carrying out True Depth of Penetration value after part of cement test specimen splits out from mould and comprises following concrete steps:
Prepare the cement specimen of 3 the same terms maintenances, described cement specimen is taken out to cleave in two from mould, scrape off powder remaining on section, coat immediately the dilute nitric acid solution that concentration is 1mol/L, after its reaction, coat again the liquor argenti nitratis ophthalmicus of 0.05mol/L, after 30 seconds, by every 5 millimeters of measurement points, measure respectively the penetration depth value of each cement specimen two sides each point;
Described in each, 7 measurement points are got respectively in side, calculate the average penetration depth value of each each side of cement specimen, finally according to the average penetration depth value of side described in each, calculate the population mean of the penetration depth value of 3 cement specimens, choosing this population mean is True Depth of Penetration value.
7. cement-based material sulfate radical depth of erosion method of testing as claimed in claim 6, is characterized in that, described impedance spectrogram comprises Nyquist figure and Bode figure.
8. cement-based material sulfate radical depth of erosion method of testing as claimed in claim 7, is characterized in that, described galvanochemistry model is: R
s(Q
1(R
ct1w
1)) (Q
2(R
ct2w
2)); Wherein,
R
sfor cement sample resistance of pore solution, Q
1for the electric double layer capacitance of cement material inside solid-liquid two-phase, R
ct1for the ion transport process resistance of cement material inside, W
1for the ion diffusion process resistance of cement material inside, Q
2for the electric double layer capacitance between cement material and battery lead plate, R
ct2for the charge transfer process resistance of electrode plate surface, W
2ion diffusion process resistance for electrode plate surface.
9. cement-based material sulfate radical depth of erosion method of testing as claimed in claim 8, is characterized in that, the funtcional relationship between described penetration depth value and electrochemical parameter value is defined as: R
ct1=aD
b; Wherein, D is penetration depth value, R
ct1for electrochemical parameter value, a, b are constant.
10. cement-based material sulfate radical depth of erosion method of testing as claimed in claim 9, is characterized in that, described prediction electrochemical parameter value and time of penetration point are exponential function relation.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907463A (en) * | 2017-11-07 | 2018-04-13 | 河海大学 | The assay method of chromate ion penetration depth in a kind of cement-based material |
| CN109655399A (en) * | 2019-01-15 | 2019-04-19 | 深圳大学 | A kind of rapid detection method of cement-based material by sulfate attack |
| CN111537401A (en) * | 2020-05-19 | 2020-08-14 | 北京林业大学 | Method for measuring fractal dimension of particulate matter |
| CN113552039A (en) * | 2021-07-22 | 2021-10-26 | 西南石油大学 | High-temperature high-pressure water-liquid sulfur two-phase infiltration testing method |
| CN117420177A (en) * | 2023-12-14 | 2024-01-19 | 山东黄河顺成水利水电工程有限公司 | Method, equipment and medium for monitoring water erosion state of earth and rockfill embankment structure |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907463A (en) * | 2017-11-07 | 2018-04-13 | 河海大学 | The assay method of chromate ion penetration depth in a kind of cement-based material |
| CN109655399A (en) * | 2019-01-15 | 2019-04-19 | 深圳大学 | A kind of rapid detection method of cement-based material by sulfate attack |
| CN111537401A (en) * | 2020-05-19 | 2020-08-14 | 北京林业大学 | Method for measuring fractal dimension of particulate matter |
| CN113552039A (en) * | 2021-07-22 | 2021-10-26 | 西南石油大学 | High-temperature high-pressure water-liquid sulfur two-phase infiltration testing method |
| CN117420177A (en) * | 2023-12-14 | 2024-01-19 | 山东黄河顺成水利水电工程有限公司 | Method, equipment and medium for monitoring water erosion state of earth and rockfill embankment structure |
| CN117420177B (en) * | 2023-12-14 | 2024-03-05 | 山东黄河顺成水利水电工程有限公司 | Method, equipment and medium for monitoring water erosion state of earth and rockfill embankment structure |
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