CN110455704B - Method and system for detecting sulfate erosion resistance of concrete material - Google Patents
Method and system for detecting sulfate erosion resistance of concrete material Download PDFInfo
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Abstract
The invention discloses a method and a system for detecting sulfate erosion resistance of a concrete material. The detection method comprises the following steps: obtaining a plurality of samples; the plurality of samples comprise an experimental group and a control group; dividing each sample into a plurality of sound measuring surfaces; carrying out initial sound velocity test on the sound testing surface of each sample to obtain an initial sound velocity; carrying out a sulfate dry-wet cycle erosion experiment on the experimental group; carrying out multiple sound velocity tests on the experimental group which completes the erosion experiment to obtain an experimental sound velocity; performing a clear water dry-wet cycle experiment on a control group; carrying out multiple sound velocity tests on the control group subjected to the clear water dry-wet cycle experiment to obtain a control sound velocity; calculating material damage parameters of each sound measurement surface according to the initial sound velocity, the experimental sound velocity and the contrast sound velocity; and judging the damage degree of each acoustic surface according to the damage parameters, and completing the detection of the sulfate erosion resistance of the concrete material. The invention realizes the continuous repeated detection of the sulfate erosion resistance of the concrete material by utilizing the ultrasonic nondestructive detection technology.
Description
Technical Field
The invention relates to the field of concrete materials, in particular to a method and a system for detecting sulfate erosion resistance of a concrete material.
Background
In the existing technical standards of the industry at home and abroad, the existing method for detecting the erosion resistance of concrete is mainly based on the strength or deformation degree (expansion rate) of a material after an erosion process, although the method is simple and convenient to operate, and has intuitive results, the test result has no repeatability on the first time, and is not beneficial to eliminating the influence of a test piece individual, and the second time, a single parameter index cannot reflect the influence of the concrete material proportion and an internal structure on the erosion process in the erosion process, and the damage difference of a concrete structure under the erosion condition cannot be correctly known, so that the inaccurate evaluation on the erosion resistance is caused.
Disclosure of Invention
The invention aims to provide a method and a system for detecting the sulfate erosion resistance of a concrete material, which realize continuous repeated detection of the sulfate erosion resistance of the concrete material by utilizing an ultrasonic nondestructive detection technology.
In order to achieve the purpose, the invention provides the following scheme:
a method for detecting sulfate erosion resistance of a concrete material comprises the following steps:
obtaining a plurality of samples; the plurality of samples comprises an experimental group and a control group; said control group comprises at least one of said samples;
dividing each sample into a plurality of sound measuring surfaces at equal intervals;
carrying out initial sound velocity test on the sound testing surface of each sample to obtain an initial sound velocity;
carrying out a sulfate dry-wet cycle corrosion experiment on the experimental group;
carrying out multiple sound velocity tests on the experimental group which completes the erosion experiment to obtain an experimental sound velocity;
performing a clear water dry-wet cycle experiment on the control group;
carrying out multiple sound velocity tests on the control group subjected to the clear water dry-wet cycle experiment to obtain a control sound velocity;
calculating material damage parameters of each sound measurement surface according to the initial sound velocity, the experimental sound velocity and the comparison sound velocity;
judging the damage degree of each sound detection surface according to the damage parameters;
and detecting the sulfate erosion resistance of the concrete material according to the damage degree of each acoustic surface.
Optionally, the initial sound velocity test is performed on the sound test surface of each sample to obtain an initial sound velocity, and the method specifically includes:
marking a plurality of test points on each acoustic surface; the test points are spaced by 20 degrees;
carrying out initial sound velocity test on the sound testing surface through the transducer along the clockwise direction; the center of the transducer is opposite to the test point.
Optionally, the determining the damage degree of each sound measurement surface according to the damage parameter specifically includes:
acquiring a maximum damage parameter and a minimum damage parameter;
calculating damage range according to the maximum damage parameter and the minimum damage parameter;
determining a damage parameter interval according to the damage range;
and judging the damage degree of each sound detection surface according to the damage parameter interval.
Optionally, before dividing each of the samples into a plurality of sound measuring surfaces at equal intervals, the method further includes:
the samples were cleaned and dried.
Optionally, before performing the initial sound velocity test on the sound detection surface of each sample, the method further includes:
and uniformly coating the couplant on the sound-measuring surface.
Optionally, the detecting the sulfate erosion resistance of the concrete material according to the damage degree of each acoustic surface specifically includes:
determining the damage degree of each sample according to the damage degree of each acoustic surface;
and determining the damage degree of the concrete material according to the damage degree of each sample, and completing the detection of the sulfate corrosion resistance of the concrete material.
The invention also provides a system for detecting the sulfate erosion resistance of the concrete material, which comprises:
the acquisition module is used for acquiring a plurality of samples; the plurality of samples comprises an experimental group and a control group; said control group comprises at least one of said samples;
the dividing module is used for dividing each sample into a plurality of sound measuring surfaces at equal intervals;
the first testing module is used for carrying out initial sound velocity testing on the sound testing surface of each sample to obtain an initial sound velocity;
the first experiment module is used for carrying out a sulfate dry-wet cycle erosion experiment on the experiment group;
the second testing module is used for carrying out sound velocity testing on the experimental group which completes the erosion experiment for multiple times to obtain the experimental sound velocity;
the second experiment module is used for carrying out a clear water dry-wet circulation experiment on the control group;
the third testing module is used for carrying out multiple sound velocity tests on the control group which completes the clear water dry-wet cycle experiment to obtain a control sound velocity;
the calculation module is used for calculating material damage parameters of the sound measurement surfaces according to the initial sound velocity, the experimental sound velocity and the comparison sound velocity;
and the judging module is used for judging the damage degree of each sound measuring surface according to the damage parameters.
And a detection module. The method is used for detecting the sulfate erosion resistance of the concrete material according to the damage degree of each acoustic surface.
Optionally, the first test module specifically includes:
the marking unit is used for marking a plurality of test points on each acoustic test surface; the test points are spaced by 20 degrees;
the testing unit is used for carrying out initial sound velocity testing on the sound testing surface through the transducer along the clockwise direction; the center of the transducer is opposite to the test point.
Optionally, the determining module specifically includes:
the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring a maximum damage parameter and a minimum damage parameter;
the calculation unit is used for calculating the damage range according to the maximum damage parameter and the minimum damage parameter;
the determining unit is used for determining a damage parameter interval according to the damage range;
and the judging unit is used for judging the damage degree of each sound measuring surface according to the damage parameter interval.
Optionally, the method further includes:
a processing module for cleaning and drying each of said samples prior to equally spaced division of said samples into a plurality of acoustic surfaces.
Compared with the prior art, the invention has the following technical effects: the invention can realize continuous repeated detection in the concrete structure erosion process by utilizing the ultrasonic nondestructive detection technology, and the adopted multi-section radial test method basically covers the whole range of a detection test piece, can quantify the damage condition of the concrete in the sulfate erosion environment, can reflect different damage states of the concrete internal structure by a multi-point test method, and has certain guidance function for adjusting the concrete gradation and improving the concrete performance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flowchart of a method for detecting sulfate erosion resistance of a concrete material according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the division of the sound-measuring surface of the sample according to the embodiment of the present invention;
FIG. 3 is a schematic diagram of labeling test points according to an embodiment of the present invention;
FIG. 4 is a block diagram of a system for detecting sulfate erosion resistance of a concrete material according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method and a system for detecting the sulfate erosion resistance of a concrete material, which realize continuous repeated detection of the sulfate erosion resistance of the concrete material by utilizing an ultrasonic nondestructive detection technology.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, a method for detecting sulfate erosion resistance of a concrete material comprises:
step 101: obtaining a plurality of samples; the plurality of samples comprises an experimental group and a control group; the control group includes at least one of the samples.
Step 102: and dividing each sample into a plurality of sound measuring surfaces at equal intervals.
Step 103: and carrying out initial sound velocity test on the sound testing surface of each sample to obtain an initial sound velocity.
Marking a plurality of test points on each acoustic surface; the test points are spaced by 20 degrees;
carrying out initial sound velocity test on the sound testing surface through the transducer along the clockwise direction; the center of the transducer is opposite to the test point.
Step 104: the test groups were subjected to a sulfate dry-wet cycle erosion test.
Step 105: and carrying out multiple sound velocity tests on the experimental group which completes the erosion experiment to obtain the experimental sound velocity.
Step 106: the control group was subjected to a clean water dry-wet cycle experiment.
Step 107: and carrying out multiple sound velocity tests on the control group which completes the dry-wet cycle experiment of the clear water to obtain the control sound velocity.
Step 108: and calculating the material damage parameters of the acoustic surface according to the initial sound velocity, the experimental sound velocity and the contrast sound velocity.
Step 109: and judging the damage degree of each sound detection surface according to the damage parameters. Specifically, the method comprises the following steps:
acquiring a maximum damage parameter and a minimum damage parameter;
calculating damage range according to the maximum damage parameter and the minimum damage parameter;
determining a damage parameter interval according to the damage range;
and judging the damage degree of each sound detection surface according to the damage parameter interval.
Step 1010: and detecting the sulfate erosion resistance of the concrete material according to the damage degree of each acoustic surface. In particular
Determining the damage degree of each sample according to the damage degree of each acoustic surface;
and determining the damage degree of the concrete material according to the damage degree of each sample, and completing the detection of the sulfate corrosion resistance of the concrete material.
Before step 102, the method further comprises:
the samples were cleaned and dried.
Before step 103, the method further comprises:
uniformly coating a couplant on the sound-measuring surface; the ultrasonic transducer can be ensured to be tightly attached to the surface of the sample. The coupling agent is butter or vaseline.
The specific embodiment is as follows:
step 1: according to the test requirements, a certain designed concrete proportion with the sulfate erosion resistance strength grade of KS15 is tested, four cylindrical test samples with the diameter of 10cm and the height of 10cm are manufactured, and standard curing is carried out according to the standard GB/T50081-plus 2002 of the test method for the mechanical property of common concrete.
Step 2: and (3) taking the test concrete sample out of the curing room at the first 2d of the sample age of 28d, cleaning the moisture dirt on the surface of the concrete, drying the concrete sample in an oven at the temperature of 80 ℃ for 48h, taking out the concrete sample, and cooling the concrete sample to the room temperature to ensure that the concrete is dried and the surface is clean.
Step (ii) of3: as shown in FIG. 2, four samples, designated by the reference numerals S1, S2, S3 and S4, were arranged in the arrangement of 4 sound-measuring surfaces H at equal intervals of 2cm from the bottom end of the sample upward as shown in FIG. 21，H2，H3，H4(ii) a As shown in FIG. 3, select H1A position on the surface sample is taken as H1Acoustic surface measurement starting point M1 1And measuring points M are arranged on the circumferential direction of the side face at equal intervals at an angle of 20 degrees in the clockwise direction1 2，M1 3，…，M1 18(ii) a Marking the starting point M of the measuring surface at the same vertical position of other sound measuring surfaces2 1，M3 1，M4 1And with H1Regular arrangement of the same faces H2，H3，H4The measurement points are left and marked with a mark pen.
And 4, step 4: after marking, testing the initial sound velocity of S1, S2, S3 and S4 one by using a high-precision nonmetal ultrasonic instrument, uniformly coating the test surface with butter or vaseline as a coupling agent before testing, and performing H-shaped test1，H2，H3，H4Sound velocity test is carried out on the sound testing surface layer by layer, and during the test, the center of the transducer is required to be opposite to the test point, namely M is measuredi 1The test was started by measuring the waveform of the sound wave completely through the sample in a clockwise direction, with the transmitting transducer from Mi 1Measuring point by measuring point in clockwise direction Mi 9Moving, receiving transducers simultaneously from Mi 10Measuring point by measuring point in clockwise direction Mi 18Moving, correspondingly testing once when the two transducers move once, calculating the test sound velocity, and sequentially recording the initial sound velocity obtained by the test as Vi,0 1，…，Vi,0 9(wherein i is the test surface number, the upper label is the test point position number of the transmitting transducer, and the test line number) after the initial test is finished, a wet towel is needed to clean the residual couplant on the surface.
And 5: after the initial test is finished, sulfate dry-wet cycle corrosion tests are carried out on S1, S2 and S3 according to a concrete sulfate corrosion resistance test method in the test method Standard for the Long-term Performance and durability of ordinary concrete GB/T50082-one 2009, S4 is set as a control group, Na2SO4 corrosion solution in the tests is replaced by clear water, the same dry-wet cycle test process is carried out with the test group, and 15 times of dry-wet cycle tests are carried out according to the requirements of the test method Standard for the Long-term Performance and durability of ordinary concrete GB/T50082-one 2009.
Step 6: after the sample drying and cooling operations of the 5 th, 10 th and 15 th dry-wet cycles are completed from the start of the erosion test, ultrasonic testing is sequentially performed on the sample layer by layer in the same operation as in the step 4, and the sound velocity is calculated. For convenience of description, the experimental sound velocities obtained by the n-th i-test surface test are sequentially recorded as Vi,n 1，…，Vi,n 9。
Note that in this step, after one ultrasonic test is completed, before the dry-wet cycle process is performed, the test piece surface couplant is wiped off by using a wet cloth, and the test piece is cleaned with an etching solution (control group) so as to prevent the couplant from affecting the test process.
To express aspects, the control group S4 test data is expressed as vi,n 1，…，vi,n 9And (4) showing.
And 7: calculating several main detection parameters
Defining Material Damage D of measurement Pointi,n jThe following formula (in the notation, i represents the number of the measuring surface, n times number, j is the number of the measuring line)
And calculating and counting the material damage parameters of each test surface according to the test result.
The following table is H in the S1 sample1The results of the area test were obtained,
in the table, the test sound speed results are in units of m/s.
And 8: and drawing a material damage parameter change time course curve of each measuring surface according to the calculation result, defining a damage area according to a final damage parameter result, when the damage parameter range of each measuring line of the same measuring surface exceeds 0.1, trisecting the damage parameter range into a heavy damage range, a medium damage range and a light damage range according to the damage parameter size, when the damage parameter range of each measuring line of the same measuring surface exceeds 0.03 and is less than 0.1, bisecting the damage parameter range into a heavy damage range and a light damage range, and when the damage parameter range of each measuring line of the same measuring surface is less than 0.03, judging that the side damage degrees are approximately consistent.
H at S11For example, the maximum damage is 0.1793, the minimum damage is 0.0907, and the damage tolerance is 0.0886, so the damage degree of the measuring surface is divided into a heavy damage area and a light damage area, and the damage parameter interval of the measuring line material of the light damage area is [0.0907, 0.135 ]]The damage parameter interval of the measuring line material in the heavier damage area is [0.135,0.1793 ]]。
And step 9: then according to the division result, the measuring lines 5, 6 and 7 are located in the light damage interval, the measuring lines 1, 2, 3, 4, 8 and 9 are located in the heavy damage interval, the measuring lines are used as the central axis of the area, and the damage area range of each measuring surface is divided according to the interval where the damage parameters obtained by calculating the measuring lines are located.
The reasonable degree of the sulfate corrosion resistance and the concrete gradation of the concrete is determined by combining the material damage degree and the damage area distribution of each measuring surface and combining the appearance of the concrete.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention can realize continuous repeated detection in the concrete structure erosion process by utilizing the ultrasonic nondestructive detection technology, and the adopted multi-section radial test method basically covers the whole range of a detection test piece, can quantify the damage condition of the concrete in the sulfate erosion environment, can reflect different damage states of the concrete internal structure by a multi-point test method, and has certain guidance function for adjusting the concrete gradation and improving the concrete performance.
As shown in fig. 4, the present invention further provides a system for detecting sulfate erosion resistance of a concrete material, wherein the system comprises:
an obtaining module 401, configured to obtain a plurality of samples; the plurality of samples comprises an experimental group and a control group; the control group includes at least one of the samples.
A dividing module 402, configured to divide each of the samples into a plurality of sound-measuring surfaces at equal intervals.
The first testing module 403 is configured to perform an initial sound velocity test on the sound test surface of each sample to obtain an initial sound velocity.
The first test module 403 specifically includes:
the marking unit is used for marking a plurality of test points on each acoustic test surface; the test points are spaced by 20 degrees;
the testing unit is used for carrying out initial sound velocity testing on the sound testing surface through the transducer along the clockwise direction; the center of the transducer is opposite to the test point.
A first experiment module 404, configured to perform a sulfate dry-wet cycle erosion experiment on the experimental group.
And a second testing module 405, configured to perform multiple sound velocity tests on the experimental group that completes the erosion experiment, so as to obtain an experimental sound velocity.
And a second experiment module 406, configured to perform a dry-wet cycle experiment on the control group.
And a third testing module 407, configured to perform multiple sound velocity tests on the control group that completes the dry-wet cycle experiment of the clear water, so as to obtain a control sound velocity.
A calculating module 408, configured to calculate a material damage parameter of each acoustic surface according to the initial sound velocity, the experimental sound velocity, and the reference sound velocity.
And the judging module 409 is used for judging the damage degree of each acoustic surface according to the damage parameters to finish the detection of the sulfate erosion resistance of the concrete material.
The determining module 409 specifically includes:
the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring a maximum damage parameter and a minimum damage parameter;
the calculation unit is used for calculating the damage range according to the maximum damage parameter and the minimum damage parameter;
the determining unit is used for determining a damage parameter interval according to the damage range;
and the judging unit is used for judging the damage degree of each sound measuring surface according to the damage parameter interval.
And the detection module 4010 is configured to detect the sulfate erosion resistance of the concrete material according to the damage degree of each acoustic surface. The method specifically comprises the following steps:
a sample damage degree determination unit for determining the damage degree of each sample according to the damage degree of each sound detection surface;
and the detection unit is used for determining the damage degree of the concrete material according to the damage degree of each sample and completing the detection of the sulfate erosion resistance of the concrete material.
The system further comprises:
a processing module for cleaning and drying each of said samples prior to equally spaced division of said samples into a plurality of acoustic surfaces.
The smearing module is used for smearing the couplant on the sound testing surfaces uniformly before the initial sound velocity test is carried out on the sound testing surfaces of the samples; the coupling agent is butter or vaseline.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A method for detecting sulfate erosion resistance of a concrete material is characterized by comprising the following steps:
obtaining a plurality of samples; the plurality of samples comprises an experimental group and a control group; said control group comprises at least one of said samples;
dividing each sample into a plurality of sound measuring surfaces at equal intervals;
carrying out initial sound velocity test on the sound testing surface of each sample to obtain initial velocity;
carrying out a sulfate dry-wet cycle corrosion experiment on the experimental group;
carrying out multiple sound velocity tests on the experimental group which completes the erosion experiment to obtain an experimental speed;
performing a clear water dry-wet cycle experiment on the control group;
carrying out multiple sound velocity tests on the control group subjected to the clear water dry-wet cycle experiment to obtain a control sound velocity;
calculating material damage parameters of each sound measurement surface according to the initial sound velocity, the experimental sound velocity and the comparison sound velocity;
judging the damage degree of each sound detection surface according to the damage parameters;
detecting the sulfate erosion resistance of the concrete material according to the damage degree of each acoustic surface;
judging the damage degree of each sound detection surface according to the damage parameters, which specifically comprises the following steps:
acquiring a maximum damage parameter and a minimum damage parameter;
calculating damage range according to the maximum damage parameter and the minimum damage parameter; determining a damage parameter interval according to the damage range;
and judging the damage degree of each sound detection surface according to the damage parameter interval.
2. The method for detecting the sulfate erosion resistance of the concrete material according to claim 1, wherein the step of performing an initial sound velocity test on the sound detection surface of each sample to obtain an initial sound velocity specifically comprises the following steps:
marking a plurality of test points on each acoustic surface; the test points are spaced by 20 degrees;
carrying out initial sound velocity test on the sound testing surface through the transducer along the clockwise direction; the center of the transducer is opposite to the test point.
3. The method for detecting the sulfate erosion resistance of the concrete material according to claim 1, wherein before dividing each of the samples into a plurality of sound-measuring surfaces at equal intervals, the method further comprises:
the samples were cleaned and dried.
4. The method for detecting sulfate erosion resistance of concrete material according to claim 1, further comprising, before performing the initial sound velocity test on the sound-measuring surface of each of the samples:
and uniformly coating the couplant on the sound-measuring surface.
5. The method for detecting the sulfate erosion resistance of the concrete material according to claim 1, wherein the step of detecting the sulfate erosion resistance of the concrete material according to the damage degree of each acoustic surface specifically comprises the following steps:
determining the damage degree of each sample according to the damage degree of each acoustic surface;
and determining the damage degree of the concrete material according to the damage degree of each sample, and completing the detection of the sulfate corrosion resistance of the concrete material.
6. A concrete material sulfate erosion resistance detection system, characterized in that, the detection system includes:
the acquisition module is used for acquiring a plurality of samples; the plurality of samples comprises an experimental group and a control group; said control group comprises at least one of said samples;
the dividing module is used for dividing each sample into a plurality of sound measuring surfaces at equal intervals;
the first testing module is used for carrying out initial sound velocity testing on the sound testing surface of each sample to obtain an initial sound velocity;
the first experiment module is used for carrying out a sulfate dry-wet cycle erosion experiment on the experiment group;
the second testing module is used for carrying out sound velocity testing on the experimental group which completes the erosion experiment for multiple times to obtain the experimental sound velocity;
the second experiment module is used for carrying out a clear water dry-wet circulation experiment on the control group;
the third testing module is used for carrying out multiple sound velocity tests on the control group which completes the clear water dry-wet cycle experiment to obtain a control sound velocity;
the calculation module is used for calculating material damage parameters of the sound measurement surfaces according to the initial sound velocity, the experimental sound velocity and the comparison sound velocity;
the judging module is used for judging the damage degree of each sound measuring surface according to the damage parameters;
and the detection module is used for detecting the sulfate erosion resistance of the concrete material according to the damage degree of each acoustic surface.
7. The system for detecting sulfate erosion resistance of concrete material according to claim 6, wherein the first testing module specifically comprises:
the marking unit is used for marking a plurality of test points on each acoustic test surface; the test points are spaced by 20 degrees;
the testing unit is used for carrying out initial sound velocity testing on the sound testing surface through the transducer along the clockwise direction; the center of the transducer is opposite to the test point.
8. The system for detecting sulfate erosion resistance of concrete material according to claim 6, wherein the judging module specifically comprises:
the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring a maximum damage parameter and a minimum damage parameter;
the calculation unit is used for calculating the damage range according to the maximum damage parameter and the minimum damage parameter;
the determining unit is used for determining a damage parameter interval according to the damage range;
and the judging unit is used for judging the damage degree of each sound measuring surface according to the damage parameter interval.
9. The system for detecting sulfate attack resistance of a concrete material according to claim 6, further comprising:
a processing module for cleaning and drying each of said samples prior to equally spaced division of said samples into a plurality of acoustic surfaces.
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| CN110954533B (en) * | 2019-12-13 | 2023-05-02 | 郑州大学 | Method for quantitatively detecting ettringite content in sulfate-corroded concrete |
| CN112540104B (en) * | 2020-12-17 | 2024-05-14 | 成都龙之泉科技股份有限公司 | Concrete matrix corrosion control quality detection method |
| CN113310882A (en) * | 2021-05-22 | 2021-08-27 | 重庆大学 | Method for evaluating low-temperature sulfate erosion resistance of cement concrete |
| CN113390970B (en) * | 2021-06-07 | 2022-05-17 | 中南大学 | Ultrasonic sound velocity detection method and system for detecting concrete performance |
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| CN110455704A (en) | 2019-11-15 |
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