CN113848185A - Sand MB value testing system and method - Google Patents
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- CN113848185A CN113848185A CN202111157260.6A CN202111157260A CN113848185A CN 113848185 A CN113848185 A CN 113848185A CN 202111157260 A CN202111157260 A CN 202111157260A CN 113848185 A CN113848185 A CN 113848185A
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- 238000012360 testing method Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000004576 sand Substances 0.000 claims abstract description 73
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 74
- 239000000243 solution Substances 0.000 claims description 68
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 claims description 54
- 229960000907 methylthioninium chloride Drugs 0.000 claims description 54
- 239000012895 dilution Substances 0.000 claims description 15
- 238000010790 dilution Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000011259 mixed solution Substances 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 description 13
- 230000009286 beneficial effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 239000010419 fine particle Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000001475 halogen functional group Chemical group 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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Abstract
The invention discloses a sand MB value testing system and a method, wherein the system comprises an MB value testing module and a result display module, and the MB value testing module is connected with the result display module; the MB value test module comprises: the device comprises a cassette, a laser emitter, a light intensity sensor, a light-transmitting container, a cassette cover and a container base; the invention aims to provide a rapid testing method for the sand MB value, which can greatly simplify the testing process of the sand MB value, shorten the testing time and avoid the need of depending on the subjective judgment of testing results by naked eyes of testing personnel.
Description
Technical Field
The invention belongs to the field of testing of concrete raw materials, and particularly relates to a sand MB value testing system and method.
Background
The sand is one of the main raw materials of the concrete, has important influence on various performances and quality of the concrete, and when the mud content in the sand is too large or the fine particles mainly comprise mud powder, the sand can greatly adsorb additives in the concrete, so that the workability of fresh concrete is seriously influenced, and in addition, the excessive mud content in the sand can also have adverse influence on the mechanical property and durability of hardened concrete. Therefore, the mud content of sand and the properties of fine particles are one of the items with the highest detection frequency in the concrete quality control link.
In engineering practice, an inspector usually determines the proportion of mud powder in fine particles in sand by using the adsorption characteristic of mud in sand to methylene blue solution. The MB value test method (called national standard method below) of the medium sand in the Standard for construction Sand (GB/T14584-2011) utilizes the principle to judge the proportion degree of the mud powder in the fine particles in the sand, and the measured MB value of the sand is the adsorption quantity of a sand sample of unit mass to methylene blue, so that a test result can be accurately obtained. However, the method is complicated in operation, the methylene blue solution needs to be added manually for multiple times, the testing time is long, the testing time needs to be increased for at least 6 minutes every time the methylene blue solution is added (namely every time the MB value of a sample to be tested is increased by 0.25), in addition, whether the testing end point is reached is judged by observing whether stable light blue color halo appears by naked eyes by a tester, for the personnel with insufficient experience, the color depth is difficult to judge by naked eyes, and because the judgment standards of different testers are inconsistent, the deviation of the testing result is easily caused.
The existing sand MB value testing method generally has the problems of complicated testing process, long testing time, difficult judgment of testing end points and the like, and a method capable of quickly, simply and accurately testing the sand MB value is urgently needed in the concrete and gravel industry.
Disclosure of Invention
Aiming at the defects in the prior art, the sand MB value testing system and method provided by the invention solve the problems that the testing process of the sand MB value is complex, the testing time is long, and the testing result needs to be subjectively judged by naked eye observation.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a sand MB value test system comprises an MB value test module and a result display module which are connected with each other; the MB value test module comprises: the device comprises a cassette, a laser emitter, a light intensity sensor and a light-transmitting container;
the light-transmitting container is fixed at the bottom of the interior of the cassette through a container base and is positioned between the laser emitter and the light intensity sensor, and a laser emitting port of the laser emitter, a laser receiving port of the light-transmitting container and a laser receiving port of the light intensity sensor are arranged on the same axis and are not in contact with each other;
the cassette is used for placing a laser emitter, a light intensity sensor and a light-transmitting container and providing an environment for acquiring light intensity readings; the laser emitter is used for emitting laser to enable the laser to penetrate through the light-transmitting container to irradiate the light intensity sensor; the light-transmitting container is used for placing a solution to be detected; the light intensity sensor is used for reading the light intensity indication of the solution to be detected.
Further: the result display module comprises a cassette wire and a display screen; the display screen is connected with the light intensity sensor through the cassette lead.
The beneficial effects of the above further scheme are: the light intensity sensor and the display screen are isolated by the cassette, so that errors in the measuring process of the light intensity sensor can be reduced.
Further: the material for manufacturing the cassette cover is light-tight resin, and the material for manufacturing the light-tight container is colorless optical quartz glass or colorless acrylic.
The beneficial effects of the above further scheme are: the material selected for the light-transmitting container can improve the accuracy of the measurement result of the light intensity sensor.
A sand MB value testing method comprises the following steps:
s1, preparing a sand MB value testing system, starting a laser emitter, and obtaining a first light intensity reading I through a light intensity sensor0；
S2, indicating the number I according to the first light intensity0Respectively mixing a plurality of first solutions with different concentrationsThe methylene blue solution is placed in a light-transmitting container, a second light intensity reading is obtained through a light intensity sensor, and then the maximum value A of the calibration concentration of the methylene blue solution and the concentration gradient coefficient k are calculated;
s3, adding water and a second methylene blue solution into the sand sample to be tested according to the set test maximum value of the MB value, and fully and uniformly stirring to obtain a mixed solution;
s4, calculating a dilution multiple N according to the maximum value A of the calibration concentration of the methylene blue solution, filtering the mixed solution to obtain clear liquid, taking quantitative clear liquid to dilute N times, adding the clear liquid into a light-transmitting container, placing the light-transmitting container in a dark box, turning on a laser emitter, and obtaining a third light intensity index I through a light intensity sensor;
and S5, calculating the MB value of the sand sample to be tested according to the concentration gradient coefficient k and the third light intensity index I, and completing the test of the MB value of the sand.
Further: in step S1, the specific method for preparing the sand MB value test system is as follows:
water is added into the light-transmitting container, and the light-transmitting container is fixed in the dark box through the container base.
The beneficial effects of the above further scheme are: the container base can fix and dismantle the printing opacity container, makes things convenient for experimental operation many times.
Further: the step S2 specifically includes:
respectively adding CiThe first methylene blue solution is put into a light-transmitting container, and a second light intensity reading I is obtained by a light intensity sensoriWherein i is the ordinal number of the first methylene blue solution, and the maximum value A of the calibrated concentration of the methylene blue solution and the gradient coefficient k of the concentration which satisfy the following formula are obtained through calculation;
in the formula, CiLess than or equal to A milligram/liter.
The beneficial effects of the above further scheme are: the obtained methylene blue solution of the sand MB value test system calibrates the maximum value A of the concentration and the gradient coefficient k of the concentration, and can be directly used in the subsequent test, thereby greatly simplifying the operation process.
Further: in the step S3, the amount of added water is VwAnd adding the second methylene blue solution in an amount which satisfies the following conditions:
wherein X is the test maximum value of the set MB value, VyThe amount of the second methylene blue solution added into the sand sample to be detected, and C is the concentration of the second methylene blue solution.
The beneficial effects of the above further scheme are: the larger the set MB value range is, the larger the consumed methylene blue solution amount is, so that the test range of the MB value can be reasonably selected according to the historical quality condition of the local sand, and the methylene blue solution can be efficiently utilized.
Further: in step S4, the dilution factor N needs to satisfy the following formula:
in the formula, VwThe amount of water added to the sand sample to be tested.
The beneficial effects of the above further scheme are: the excessively low dilution factor N affects the calculation result of the MB value of the sand sample to be measured, and the set lowest value of the dilution factor N needs to be calculated.
Further: in step S5, the calculation formula of the MB value of the sand sample to be measured is specifically:
in the formula I0Is the first light intensity index, I is the third light intensity index, N is the dilution multiple of the mixed solution, C is the concentration of the second methylene blue solution, k is the concentration gradient coefficient, m is the concentration gradient coefficientsX is the test maximum value of the set MB value, which is the weight of the sand sample to be tested.
The beneficial effects of the above further scheme are: the MB value of the sand sample to be detected calculated by the formula has high accuracy.
The invention has the beneficial effects that:
(1) no matter how large the MB value of the sand sample to be tested is, the methylene blue solution only needs to be added once, thereby greatly simplifying the operation steps, shortening the testing time and improving the testing efficiency.
(2) The test result is judged subjectively without depending on the naked eye of a tester, so that the test result is more accurate and reliable.
(3) In actual use, the device is calibrated before the first test to obtain the maximum value A of the calibrated concentration of the methylene blue solution and the concentration gradient coefficient k, and the calibrated parameters are directly used in the subsequent test.
Drawings
FIG. 1 is a schematic structural diagram of a sand MB value testing device according to the present invention;
FIG. 2 is a flow chart of the present invention;
wherein: 1. a cassette; 2. a laser transmitter; 3. a light intensity sensor; 4. a light-transmissive container; 11. a cassette cover; 31. a cassette wire; 32. a display screen; 41. a container base.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, in an embodiment of the present invention, a sand MB value testing system includes an MB value testing module and a result displaying module connected to each other; the MB value test module comprises: the device comprises a cassette 1, a laser emitter 2, a light intensity sensor 3 and a light-transmitting container 4;
the cassette 1 is provided with a cassette cover 11 above a light-transmitting container 4, the laser emitter 2 and the light intensity sensor 3 are both fixed at the bottom inside the cassette 1, the light-transmitting container 4 is fixed at the bottom inside the cassette 1 through a container base 41 and is positioned between the laser emitter 2 and the light intensity sensor 3, and a laser emitting port of the laser emitter 2, a laser receiving port of the light-transmitting container 4 and a laser receiving port of the light intensity sensor 3 are arranged on the same axis and are not in contact with each other;
the cassette 1 is used for placing a laser emitter 2, a light intensity sensor 3 and a light-transmitting container 4 and providing an environment for acquiring light intensity readings; the laser emitter 2 is used for emitting laser which penetrates through the light-transmitting container 4 to irradiate the light intensity sensor 3; the light-transmitting container 4 is used for placing a solution to be detected; the light intensity sensor 3 is used for reading the light intensity indication of the solution to be measured.
The laser emitter 2 has a wavelength range of 650-680 nm, and the light-transmitting container 4 is a rectangular test tube.
The result display module includes cassette wires 31 and a display screen 32; the display screen 32 is connected with the light intensity sensor 3 through the cassette wire 31; the cassette wire 31 is used to connect the display screen 32 and the light intensity sensor 3, and the display screen 32 is used to display the light intensity readings read by the light intensity sensor 3.
The material for making the cassette cover 11 is opaque resin, and the material for making the light-transmitting container 4 is colorless optical quartz glass or colorless acrylic.
In this embodiment, as shown in fig. 2, a sand MB value testing method includes the following steps:
s1, preparing a sand MB value testing system, starting the laser emitter 2, and obtaining a first light intensity reading I through the light intensity sensor 30；
S2, indicating the number I according to the first light intensity0Respectively placing a plurality of first methylene blue solutions with different concentrations in a light-transmitting container 4, obtaining a second light intensity reading through a light intensity sensor 3, and further calculating a maximum value A of the calibration concentration of the methylene blue solution and a concentration gradient coefficient k;
s3, adding water and a second methylene blue solution into the sand sample to be tested according to the set test maximum value of the MB value, and fully and uniformly stirring to obtain a mixed solution;
s4, calculating a dilution multiple N according to the maximum value A of the calibrated concentration of the methylene blue solution, filtering the mixed solution to obtain clear solution, taking quantitative clear solution to dilute N times, adding the clear solution into a light-transmitting container 4, placing the light-transmitting container 4 in a dark box 1, turning on a laser emitter 2, and obtaining a third light intensity index I through a light intensity sensor 3;
and S5, calculating the MB value of the sand sample to be tested according to the concentration gradient coefficient k and the third light intensity index I, and completing the test of the MB value of the sand.
In step S1, the specific method for preparing the sand MB value test system is as follows:
water is added to the light-transmitting container 4, and the light-transmitting container 4 is fixed in the cassette 1 through the container base 41.
In the present embodiment, the cassette 1 and the cassette cover 11 are made of a resin material that is opaque to light; the laser transmitter 2 is a monochromatic laser modulation transmitter, can directionally transmit laser with the wavelength of 665nm, and has the rated transmitting power of 5 mW; the light sensing range of the light intensity sensor 3 is 0-10mW, and an LED display screen 32 is arranged to display the light intensity irradiated on the sensor in real time; the light-transmitting container 4 is a rectangular test tube made of colorless optical quartz glass, the inner dimension of the light-transmitting container is 10mm multiplied by 3mm, and the thickness of the test tube wall is 0.2 mm;
the step S2 specifically includes:
respectively adding CiThe first methylene blue solution is put into a light-transmitting container 4, and a second light intensity reading I is obtained by a light intensity sensor 3iWherein i is the ordinal number of the first methylene blue solution, and the maximum value A of the calibrated concentration of the methylene blue solution and the gradient coefficient k of the concentration which satisfy the following formula are obtained through calculation;
in the formula, CiLess than or equal to A milligram/liter.
In this example, the first methylene was added at a concentration of 0.5mg/L, 1mg/L, 1.5mg/L, 2mg/L, 2.5mg/L, 3mg/L, 3.5mg/L, 4mg/L, 4.5mg/L, 5mg/L, 5.5mg/L, 6mg/L, 6.5mg/L, 7mg/L, 7.5mg/L, 8mg/L, 8.5mg/L, 9mg/L, 9.5mg/L and 10mg/L, respectivelyThe blue solution is placed in a light-transmitting container 4, a second light intensity reading is obtained through a light intensity sensor 3, when the concentration of the first methylene blue solution is less than 7mg/L through fitting calculation,
i.e., k is 0.15.
Wherein, CjIs the concentration of the first methylene blue solution with the concentration less than 7mg/L, and j is the ordinal number of the first methylene blue solution with the concentration less than 7 mg/L.
In the step S3, the amount of added water is VwAnd adding the second methylene blue solution in an amount which satisfies the following conditions:
wherein X is the test maximum value of the set MB value, VyThe amount of the second methylene blue solution added into the sand sample to be detected, and C is the concentration of the second methylene blue solution.
In this example, the maximum test range of the MB value of the device is set to 1.5g/kg, and 0.5L of water and V are added to 0.2kg of the sand sample to be tested at one timey0.03L of a second methylene blue solution having a concentration of 10g/L was added thereto under stirring for 10 minutes.
In step S4, the dilution factor N needs to satisfy the following formula:
in the formula, VwThe amount of water added to the sand sample to be tested.
In this embodiment, a small amount of clear liquid is filtered out by a needle filter, the dilution factor N of the clear liquid is calculated to be not less than 81 times, the dilution factor N is set to 100, the mixed liquid is filtered to obtain the clear liquid, 1mL of the clear liquid is diluted by 100 times, the clear liquid is added into a rectangular test tube, the rectangular test tube is placed into a cassette 1 and fixed by a container base 41, wherein the liquid level of the solution in the rectangular test tube is higher than the height for emitting a laser beam, and a monochromatic laser modulation emitter is turned on to obtain a third light intensity reading I of 2.6 mW.
In step S5, the calculation formula of the MB value of the sand sample to be measured is specifically:
in the formula I0Is the first light intensity index, I is the third light intensity index, N is the dilution multiple of the mixed solution, C is the concentration of the second methylene blue solution, k is the concentration gradient coefficient, m is the concentration gradient coefficientsX is the test maximum value of the set MB value, which is the weight of the sand sample to be tested.
In this embodiment, the first light intensity indication I is obtained0Calculated 5mW and third light intensity reading I2.6 mW
In actual use, the device is calibrated before the first test to obtain the maximum value A of the calibrated concentration of the methylene blue solution and the concentration gradient coefficient k, and calibrated parameters are directly used in the subsequent test. In addition, the calculation formula shows that the larger the selected MB value range is, the larger the consumed methylene blue solution amount is, so that the test range of the MB value can be reasonably selected according to the historical quality condition of the local sand, and the methylene blue solution can be effectively utilized.
The system of the invention has the working process that: preparing a sand MB value testing system, adding clear water into a light-transmitting container 4, putting the light-transmitting container into a cassette 1, opening a laser emitter 2, and obtaining a first light intensity reading I through a light intensity sensor 30(ii) a Respectively placing a plurality of first methylene blue solutions with different concentrations in a light-transmitting container 4, obtaining a second light intensity reading through a light intensity sensor 3, and obtaining a maximum value A of the calibrated concentration of the methylene blue solution and a concentration gradient coefficient k by adopting fitting calculation; setting a test maximum X of MB values according to
Calculate the volume of the second methylene blue solution addedProduct VyAdding V into the sand sample to be measuredwWater and amount of VyThe second methylene blue solution is fully and uniformly stirred to obtain a mixed solution; according to
Calculating the minimum value of the dilution multiple N, further setting the size of the dilution multiple N, filtering the mixed solution to obtain clear liquid, taking quantitative clear liquid to dilute N times, adding the clear liquid into a light-transmitting container 4, placing the light-transmitting container 4 in a dark box 1, fixing the light-transmitting container 4 by using a container base 41, opening a laser emitter 2, and obtaining a third light intensity index I through a light intensity sensor 3; based on the obtained third light intensity indication I, by
And calculating the MB value of the sand sample to be tested, and completing the test of the MB value of the sand.
The invention has the beneficial effects that: no matter how large the MB value of the sand sample to be tested is, the methylene blue solution only needs to be added once, thereby greatly simplifying the operation steps, shortening the testing time and improving the testing efficiency;
the test result is judged subjectively by naked eyes without depending on testers, so that the test result is more accurate and reliable;
in the description of the present invention, it is to be understood that the terms "center", "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "radial", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or an implicit indication of the number of technical features. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features.
Claims (9)
1. A sand MB value test system is characterized by comprising an MB value test module and a result display module which are connected with each other; the MB value test module comprises: the device comprises a cassette (1), a laser emitter (2), a light intensity sensor (3) and a light-transmitting container (4);
the cassette (1) is provided with a cassette cover (11) above the light-transmitting container (4), the laser emitter (2) and the light intensity sensor (3) are both fixed at the bottom inside the cassette (1), the light-transmitting container (4) is fixed at the bottom inside the cassette (1) through a container base (41) and is positioned between the laser emitter (2) and the light intensity sensor (3), and a laser emitting port of the laser emitter (2), a laser receiving port of the light-transmitting container (4) and a laser receiving port of the light intensity sensor (3) are arranged on the same axis and are not in contact with each other;
the cassette (1) is used for placing the laser emitter (2), the light intensity sensor (3) and the light-transmitting container (4) and providing an environment for acquiring light intensity readings; the laser emitter (2) is used for emitting laser to penetrate through the light-transmitting container (4) to irradiate the light intensity sensor (3); the light-transmitting container (4) is used for placing a solution to be detected; the light intensity sensor (3) is used for reading the light intensity indication of the solution to be detected.
2. The sand MB value testing system according to claim 1, wherein the result display module comprises a cassette wire (31) and a display screen (32); the display screen (32) is connected with the light intensity sensor (3) through the cassette lead (31).
3. The sand MB value test system according to claim 1, wherein the cassette cover (11) is made of a light-tight resin, and the light-tight container (4) is made of a colorless optical quartz glass or a colorless acrylic.
4. A sand MB value testing method is characterized by comprising the following steps:
s1, preparing a sand MB value testing system, and turning on a laserA transmitter (2) for obtaining a first light intensity indication I by a light intensity sensor (3)0；
S2, indicating the number I according to the first light intensity0Respectively placing a plurality of first methylene blue solutions with different concentrations in a light-transmitting container (4), obtaining a second light intensity reading through a light intensity sensor (3), and further calculating a maximum value A of the calibration concentration of the methylene blue solution and a concentration gradient coefficient k;
s3, adding water and a second methylene blue solution into the sand sample to be tested according to the set test maximum value of the MB value, and fully and uniformly stirring to obtain a mixed solution;
s4, calculating a dilution multiple N according to the maximum value A of the calibrated concentration of the methylene blue solution, filtering the mixed solution to obtain clear solution, taking quantitative clear solution to dilute N times, adding the clear solution into a light-transmitting container (4), placing the light-transmitting container (4) in a dark box (1), turning on a laser emitter (2), and obtaining a third light intensity index I through a light intensity sensor (3);
and S5, calculating the MB value of the sand sample to be tested according to the concentration gradient coefficient k and the third light intensity index I, and completing the test of the MB value of the sand.
5. The sand MB value testing method according to claim 4, wherein in the step S1, the specific method for preparing the sand MB value testing system is as follows:
water is added into the light-transmitting container (4), and the light-transmitting container (4) is fixed in the cassette (1) through the container base (41).
6. The sand MB value testing method according to claim 4, wherein the step S2 is specifically:
respectively adding CiThe first methylene blue solution is put into a light-transmitting container (4), and a second light intensity indication I is obtained by a light intensity sensor (3)iWherein i is the ordinal number of the first methylene blue solution, and the maximum value A of the calibrated concentration of the methylene blue solution and the gradient coefficient k of the concentration which satisfy the following formula are obtained through calculation;
in the formula, CiLess than or equal to A milligram/liter.
7. The sand MB value test method according to claim 4, wherein in the step S3, water is added in an amount of VwAnd adding the second methylene blue solution in an amount which satisfies the following conditions:
wherein X is the test maximum value of the set MB value, VyThe amount of the second methylene blue solution added into the sand sample to be detected, and C is the concentration of the second methylene blue solution.
8. The sand MB value test method according to claim 7, wherein in the step S4, the dilution factor N is required to satisfy the following formula:
in the formula, VwThe amount of water added to the sand sample to be tested.
9. The sand MB value testing method according to claim 8, wherein in the step S5, the computing formula of the MB value of the sand sample to be tested is specifically:
in the formula I0Is the first light intensity index, I is the third light intensity index, N is the dilution multiple of the mixed solution, C is the concentration of the second methylene blue solution, k is the concentration gradient coefficient, m is the concentration gradient coefficientsX is the test maximum value of the set MB value, which is the weight of the sand sample to be tested.
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