CN113848185B - Sand MB value test system and method - Google Patents
Sand MB value test system and method Download PDFInfo
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- CN113848185B CN113848185B CN202111157260.6A CN202111157260A CN113848185B CN 113848185 B CN113848185 B CN 113848185B CN 202111157260 A CN202111157260 A CN 202111157260A CN 113848185 B CN113848185 B CN 113848185B
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- 238000012360 testing method Methods 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000004576 sand Substances 0.000 claims abstract description 68
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 69
- 239000000243 solution Substances 0.000 claims description 69
- 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 52
- 229960000907 methylthioninium chloride Drugs 0.000 claims description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000012895 dilution Substances 0.000 claims description 15
- 238000010790 dilution Methods 0.000 claims description 15
- 239000011259 mixed solution Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 4
- 238000004519 manufacturing process 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
- 239000007788 liquid Substances 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 9
- 239000010419 fine particle Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
Classifications
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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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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
Abstract
The invention discloses a sand MB value test system and a method, wherein the system comprises an MB value test module and a result display module, and the MB value test 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 a sand MB value, which can greatly simplify the testing process of the sand MB value, shorten the testing time and does not need to rely on a tester to subjectively judge the testing result by naked eyes.
Description
Technical Field
The invention belongs to the field of concrete raw material testing, and particularly relates to a sand MB value testing system and method.
Background
Sand is one of the main raw materials of concrete, has important influence on various properties and quality of the concrete, and when the mud content in the sand is too large or fine particles mainly adopt mud powder as main materials, the sand can produce larger adsorption on additives in the concrete, so that the workability of fresh concrete is seriously influenced, and in addition, too much mud in the sand can produce 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, the detection personnel usually use the adsorption property of mud in sand to methylene blue solution to judge the proportion degree of mud powder in fine particles in sand. The method for testing the MB value of the sand in the building sand (GB/T14584-2011) standard (hereinafter referred to as national standard method) utilizes the principle to judge the proportion degree of mud powder in fine particles in the sand, and the measured MB value of the sand is the adsorption quantity of a sand sample with 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 manually added for many times, the test time is long, the test time needs to be increased by at least 6 minutes every time the methylene blue solution is added (namely, the MB value of a sample to be tested is increased by 0.25), in addition, the method judges whether the test end point is reached or not by observing whether stable light blue halation appears stably with naked eyes by a tester, for people with insufficient experience, the judgment of the color depth by naked eyes is difficult, and the deviation of test results is easy to be caused because the judgment standards of different testers are inconsistent.
The existing sand MB value test method has the problems of complicated test process, long test time, difficult judgment of a test end point and the like, and the concrete and sand industries need a method capable of quickly, simply and accurately testing the sand MB value.
Disclosure of Invention
Aiming at the defects in the prior art, the sand MB value testing system and the sand MB value testing 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 subjective judgment testing result is needed to be observed by relying on naked eyes.
In order to achieve the aim of the invention, the invention adopts the following technical scheme: 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 testing module includes: the device comprises a cassette, a laser emitter, a light intensity sensor and a light-transmitting container;
the laser transmitting device comprises a light transmitting container, a laser transmitter, a light intensity sensor, a laser transmitter, a laser receiving port, a light intensity sensor, a cassette cover, a laser transmitter, a light intensity sensor and a cassette cover, wherein the cassette cover is arranged above the light transmitting container;
the cassette is used for placing the laser emitter, the light intensity sensor and the light-transmitting container and providing an environment for acquiring the light intensity indication; the laser emitter is used for emitting laser to irradiate the light intensity sensor through the light-transmitting container; the light-transmitting container is used for placing the tested solution; the light intensity sensor is used for reading the light intensity indication of the measured solution.
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 wire.
The beneficial effects of the above-mentioned 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 manufacturing material of the cassette cover is opaque resin, and the manufacturing material of the transparent container is colorless optical quartz glass or colorless acrylic.
The beneficial effects of the above-mentioned further scheme are: the choice of such a material for the light-transmitting container may improve the accuracy of the measurement result of the light intensity sensor.
A sand MB value testing method, comprising the steps of:
s1, preparing a sand MB value test system, starting a laser emitter, and obtaining a first light intensity indication I through a light intensity sensor 0 ；
S2, indicating I according to the first light intensity 0 Respectively placing a plurality of first methylene blue solutions with different concentrations into a light-transmitting container, obtaining a second light intensity indication through a light intensity sensor, and further calculating a maximum value A of the calibrated 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 factor 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 a fixed amount of clear solution to dilute the clear solution by N times, adding the clear solution into a light-transmitting container, placing the light-transmitting container into a cassette, opening a laser emitter, and obtaining a third light intensity indication 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 indication I, and finishing the sand MB value test.
Further: in the step S1, a specific method for preparing the sand MB value test system is as follows:
water is added to the light-transmitting container and the light-transmitting container is secured in the cartridge by the container base.
The beneficial effects of the above-mentioned further scheme are: the container base can fix and detach the light-transmitting container, so that multiple test operations are facilitated.
Further: the step S2 specifically comprises the following steps:
respectively give the concentration of C i Is placed in a light-transmitting container, and a second light intensity indication I is obtained by a light intensity sensor i Wherein 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 concentration gradient coefficient k meeting the following formula are obtained through calculation;
wherein C is i Less than or equal to A mg/L.
The beneficial effects of the above-mentioned further scheme are: the methylene blue solution calibration concentration maximum A value and the concentration gradient coefficient k of the obtained sand MB value test system can be directly used in the subsequent test, and the operation flow is greatly simplified.
Further: in the step S3, the water is added in an amount of V w The amount of the second methylene blue solution added is such that:
wherein X is the test maximum value of the set MB value, V y Adding second methylene blue solution into sand sample to be testedC is the concentration of the second methylene blue solution.
The beneficial effects of the above-mentioned further scheme are: the larger the MB value range is, the larger the amount of the methylene blue solution is consumed, so that the test range of the MB value can be reasonably selected according to the historical quality condition of local sand, and the methylene blue solution can be efficiently utilized.
Further: in the step S4, the dilution multiple N needs to satisfy the following formula:
wherein V is w The amount of water added to the sand sample to be tested.
The beneficial effects of the above-mentioned further scheme are: too low dilution factor N can affect the calculation result of MB value of the sand sample to be measured, and the set minimum value of the dilution factor N needs to be calculated.
Further: in the step S5, the calculation formula of the MB value of the sand sample to be measured is specifically:
wherein I is 0 The first light intensity indication number is that of the third light intensity indication number, 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 s For the weight of the sand sample to be tested, X is the test maximum value for which the MB value is set.
The beneficial effects of the above-mentioned further scheme are: the MB value accuracy of the sand sample to be detected calculated by the formula is high.
The beneficial effects of the invention are as follows:
(1) The methylene blue solution is only required to be added once no matter how large the MB value of the sand sample to be tested is, so that the operation steps are greatly simplified, the test time is shortened, and the test efficiency is improved.
(2) The test result is more accurate and reliable without depending on subjective judgment of test personnel by naked eyes.
(3) In actual use, the device is calibrated before the first test to obtain the maximum value A of the methylene blue solution calibration concentration and the concentration gradient coefficient k, and the calibrated parameters are directly used in the subsequent test.
Drawings
FIG. 1 is a schematic diagram of a sand MB value test apparatus according to the present invention;
FIG. 2 is a flow chart of the present invention;
wherein: 1. cassette; 2. a laser emitter; 3. a light intensity sensor; 4. a light-transmitting container; 11. cassette cover; 31. cassette wires; 32. a display screen; 41. a container base.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate 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 all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
As shown in fig. 1, in one embodiment of the present invention, a sand MB value testing system includes an MB value testing module and a result display module that are connected to each other; the MB value test module comprises: a cassette 1, a laser emitter 2, a light intensity sensor 3, and a light-transmitting container 4;
wherein, the cassette 1 is provided with a cassette cover 11 above the transparent container 4, the laser transmitter 2 and the light intensity sensor 3 are fixed at the bottom of the interior of the cassette 1, the transparent container 4 is fixed at the bottom of the interior of the cassette 1 through the container base 41, and the positions thereof are in the middle of the laser transmitter 2 and the light intensity sensor 3, the laser transmitting port of the laser transmitter 2, the laser receiving port of the transparent container 4 and the light intensity sensor 3 are arranged on the same axis and are not contacted 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 the light intensity indication; the laser transmitter 2 is used for transmitting laser to irradiate the light intensity sensor 3 through the light-transmitting container 4; the light-transmitting container 4 is used for placing the solution to be tested; the light intensity sensor 3 is used for reading the light intensity indication of the measured solution.
The laser transmitter 2 emits laser with the wavelength range of 650-680 nanometers, and the transparent container 4 is a rectangular test tube.
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 wire 31; the cassette wire 31 is used for connecting the display screen 32 and the light intensity sensor 3, and the display screen 32 is used for displaying the light intensity indication read by the light intensity sensor 3.
The cassette cover 11 is made of opaque resin, and the light-transmitting container 4 is made of 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 test system, starting a laser emitter 2, and obtaining a first light intensity indication I through a light intensity sensor 3 0 ；
S2, indicating I according to the first light intensity 0 Respectively placing a plurality of first methylene blue solutions with different concentrations into a light-transmitting container 4, obtaining a second light intensity indication through a light intensity sensor 3, and further calculating a maximum value A of the calibrated 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 factor 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 a fixed amount of clear solution to dilute by N times, adding the clear solution into a transparent container 4, placing the transparent container 4 into a cassette 1, opening a laser emitter 2, and obtaining a third light intensity indication 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 indication I, and finishing the sand MB value test.
In the step S1, a 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 by 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 emitter 2 is a monochromatic laser modulation emitter, can directionally emit laser with the wavelength of 665nm, and has the rated emission power of 5mW; the light intensity sensor 3 has a light sensing range of 0-10mW, and is provided with an LED display screen 32 which can 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 internal dimension is 10mm multiplied by 3mm, and the thickness of the wall of the test tube is 0.2mm;
the step S2 specifically comprises the following steps:
respectively give the concentration of C i Is placed in a light-transmitting container 4 and a second indication of light intensity I is obtained by means of a light intensity sensor 3 i Wherein 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 concentration gradient coefficient k meeting the following formula are obtained through calculation;
wherein C is i Less than or equal to A mg/L.
In this example, first methylene blue solutions having concentrations 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, respectively, were placed in the light-transmitting container 4, and second light intensity indications were obtained by the light intensity sensor 3, and when the first methylene blue solution concentration was less than 7mg/L, fitting calculation was performed,i.e. k=0.15.
Wherein C is j For the concentration of the first methylene blue solution having a concentration of less than 7mg/L, j is the ordinal number of the first methylene blue solution having a concentration of less than 7 mg/L.
In the step S3 of the above-mentioned process,the amount of water added is V w The amount of the second methylene blue solution added is such that:
wherein X is the test maximum value of the set MB value, V y And adding the second methylene blue solution into the sand sample to be detected, wherein C is the concentration of the second methylene blue solution.
In this example, the maximum MB value test range of the apparatus was set to 1.5g/kg, and 0.5L of water and V were added to 0.2kg of the sand sample to be tested at a time y Second methylene blue solution with concentration of 10 g/l=1.5×0.2/10=0.03L, and stirring was carried out for 10 minutes.
In the step S4, the dilution multiple N needs to satisfy the following formula:
wherein V is w The 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=100 is set, the mixed liquid is filtered to obtain clear liquid, 1mL of clear liquid is taken to dilute 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, the liquid level of the solution in the rectangular test tube is higher than the height of the emitted laser beam, and a monochromatic laser modulation emitter is turned on to obtain a third light intensity indication I of 2.6mW.
In the step S5, the calculation formula of the MB value of the sand sample to be measured is specifically:
wherein I is 0 The first light intensity is shown in number, the third light intensity is shown in number, N is the dilution multiple of the mixed solution, C is the concentration of the second methylene blue solution, and k is the concentrationGradient coefficient, m s For the weight of the sand sample to be tested, X is the test maximum value for which the MB value is set.
In the present embodiment, the number I is shown according to the obtained first light intensity 0 Calculated by =5 mW and third intensity indication i=2.6 mW
In actual use, the device is calibrated before the first test to obtain the maximum value A of the methylene blue solution calibration concentration and the concentration gradient coefficient k, and the calibrated parameters are directly used in the subsequent test. In addition, according to a calculation formula, the larger the MB value range is selected, the larger the amount of the methylene blue solution is consumed, so that the test range of the MB value can be reasonably selected according to the historical quality condition of local sand, and the methylene blue solution can be efficiently utilized.
The working process of the system of the invention is as follows: preparing a sand MB value test system, adding clear water into a light-transmitting container 4, putting the clear water into a cassette 1, turning on a laser emitter 2, and obtaining a first light intensity indication I through a light intensity sensor 3 0 The method comprises the steps of carrying out a first treatment on the surface of the Respectively placing a plurality of first methylene blue solutions with different concentrations into a light-transmitting container 4, obtaining a second light intensity indication through a light intensity sensor 3, and obtaining a methylene blue solution calibration concentration maximum value A and a concentration gradient coefficient k by fitting calculation; setting the test maximum value X of MB value according toCalculating the volume V of the added second methylene blue solution y Adding the sand sample to be measured with the addition amount V w The water sum of (2) is V y The second methylene blue solution is fully and uniformly stirred to obtain a mixed solution; according to->Calculating the minimum value of the dilution factor N, setting the size of the dilution factor N, filtering the mixed solution to obtain clear liquid, taking a certain amount of clear liquid to dilute by N times, adding the clear liquid into the transparent container 4, placing the transparent container 4 into the cassette 1, fixing the transparent container with the container base 41,turning on the laser emitter 2 to obtain a third light intensity indication I through the light intensity sensor 3; by reading I according to the obtained third light intensityAnd calculating the MB value of the sand sample to be tested, and completing the sand MB value test.
The beneficial effects of the invention are as follows: no matter how large the MB value of the sand sample to be tested is, the methylene blue solution is only required to be added at one time, so that the operation steps are greatly simplified, the test time is shortened, and the test efficiency is improved;
the test result is more accurate and reliable without depending on subjective judgment of test personnel by naked eyes;
in the description of the present invention, it should be understood that the terms "center," "thickness," "upper," "lower," "horizontal," "top," "bottom," "inner," "outer," "radial," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not 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 interpreted as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defined as "first," "second," "third," or the like, may explicitly or implicitly include one or more such feature.
Claims (1)
1. The sand MB value testing method is applied to a sand MB value testing system, and the system comprises an MB value testing module and a result display module which are connected with each other; the MB value testing module includes: the device comprises a cassette (1), a laser emitter (2), a light intensity sensor (3) and a light-transmitting container (4);
the light-transmitting container (4) is fixed at the bottom of the inside of the cassette (1) through a container base (41), the light-transmitting container (4) is positioned in the middle of the laser transmitter (2) and the light intensity sensor (3), and a laser transmitting port of the laser transmitter (2), a laser receiving port of the light-transmitting container (4) and the light intensity sensor (3) are arranged on the same axis and are not contacted 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 irradiate the light intensity sensor (3) through the light-transmitting container (4); the light-transmitting container (4) is used for placing the tested solution; the light intensity sensor (3) is used for reading the light intensity indication of the measured solution;
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 wire (31);
the manufacturing material of the cassette cover (11) is opaque resin, and the manufacturing material of the transparent container (4) is colorless optical quartz glass or colorless acrylic;
the method is characterized by comprising the following steps of:
s1, preparing a sand MB value test system, starting a laser emitter (2), and obtaining a first light intensity indication I through a light intensity sensor (3) 0 ；
S2, indicating I according to the first light intensity 0 Respectively placing a plurality of first methylene blue solutions with different concentrations into a light-transmitting container (4), obtaining a second light intensity indication through a light intensity sensor (3), and further calculating a maximum value A of the calibrated 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 a fixed amount of clear solution to dilute the clear solution by N times, adding the clear solution into a light-transmitting container (4), placing the light-transmitting container (4) into a cassette (1), opening a laser emitter (2), and obtaining a third light intensity indication I through a light intensity sensor (3);
s5, calculating an MB value of the sand sample to be tested according to the concentration gradient coefficient k and the third light intensity indication I, and finishing the sand MB value test;
in the step S1, a specific method for preparing the sand MB value test system is as follows:
adding water into the light-transmitting container (4), and fixing the light-transmitting container (4) in the cassette (1) through the container base (41);
the step S2 specifically comprises the following steps:
respectively give the concentration of C i Is placed in a light-transmitting container (4) and a second light intensity indication I is obtained by a light intensity sensor (3) i Wherein 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 concentration gradient coefficient k meeting the following formula are obtained through calculation;
wherein C is i Less than or equal to A mg/L;
in the step S3, the water is added in an amount of V w The amount of the second methylene blue solution added is such that:
wherein X is the test maximum value of the set MB value, V y Adding the second methylene blue solution into the sand sample to be detected, wherein C is the concentration of the second methylene blue solution;
in the step S4, the dilution multiple N needs to satisfy the following formula:
wherein V is w Adding water into the sand sample to be detected;
in the step S5, the calculation formula of the MB value of the sand sample to be measured is specifically:
wherein I is 0 The first light intensity indication number is that of the third light intensity indication number, 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 s For the weight of the sand sample to be tested, X is the test maximum value for which the MB value is set.
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