A method for detecting the strength of anti-mud sacrificial agent in inhibiting the adsorption of clay minerals

Abstract

The present invention discloses a method for detecting the strength of the anti-mud sacrificial agent in inhibiting the adsorption of clay minerals. The method comprises the following steps: S1, preparing a methylene blue solution; S2, weighing standard sand and clay minerals and mixing them evenly; S3, preparing an anti-mud sacrificial agent solution; S4, mixing the anti-mud sacrificial agent solution with standard sand and clay minerals; S5, drying the mixture to obtain pre-treated machine-made sand; S6, mixing and stirring the pre-treated machine-made sand and distilled water to prepare a suspension; S7, detecting the total amount V of the added methylene blue solution; S8, calculating the methylene blue value of the anti-mud sacrificial agent to be tested; S9, obtaining the reference methylene blue value MB2; S10, calculating the calibration value of the anti-mud sacrificial agent's ability to inhibit the adsorption of clay minerals and recording it as P. The present invention has the characteristics of simple operation, low cost and accurate results, and is suitable for evaluating the performance of anti-mud sacrificial agents in scientific research, and is also suitable for quality acceptance of anti-mud sacrificial agents in the building materials industry.

Description

Technical Field

[0001] The invention relates to the field of concrete and machine-made sand manufacturing, and in particular to a method for detecting the strength of an anti-mud sacrificial agent in inhibiting the adsorption of clay minerals. Background Art

[0002] With the rapid development of concrete technology, concrete is increasingly used in roads, bridges, dams and civil buildings. The demand for concrete in both national and civil projects is increasing year by year. However, as the country takes sustainable development as a basic national policy and pays more and more attention to ecological environmental protection, the mining of sand and gravel materials required for concrete is subject to more and more restrictions. As a result, there is a serious shortage of high-quality coarse and fine aggregates, and machine-made sand gradually enters the market, resulting in higher and higher mud content in concrete. The increase in mud content leads to the introduction of a large amount of bentonite, kaolin and other minerals that can quickly absorb polycarboxylate water reducers in a short time into the concrete, causing serious loss of fluidity, slump retention and other properties of the initial mix concrete, and loss of working performance.

[0003] In order to solve the problem of clay minerals adsorbing polycarboxylic acid water-reducing agents and causing concrete performance to decline, a solution of using anti-mud sacrificial agents to inhibit the adsorption of clay minerals has been proposed. In the national standard GB / T14684-2011 "Sand for Construction", the method of testing the methylene blue value is used as a standard for evaluating the adsorption performance of construction sand. At present, macroscopic properties such as net slurry fluidity, mortar fluidity, and concrete slump / expansion are mostly used to evaluate the performance of anti-mud sacrificial agents. However, since materials such as cement, sand, stone, and concrete admixtures are difficult to standardize, these methods can only qualitatively evaluate the relative increase in the performance of cement-based materials by one or several anti-mud sacrificial agents. There is no simple and accurate evaluation method for quantitatively evaluating the ability of one or several anti-mud sacrificial agents to inhibit the adsorption of clay minerals.

[0004] Research institutions in the existing technology usually use total organic carbon (TOC) to test the adsorption amount of anti-mud sacrificial agents on clay minerals to calibrate the performance of anti-mud sacrificial agents. This method is very accurate, but because the instruments and equipment are expensive and the experimental steps are complicated, it is difficult to widely promote to various concrete and artificial sand manufacturing companies.

[0005] The applicant has found that the prior art has at least the following technical problems:

[0006] 1. In the existing technology, there is a lack of detection methods for quantitatively evaluating the anti-mud sacrificial agent's ability to inhibit the adsorption of clay minerals in concrete and machine-made sand manufacturing companies in the building materials industry. Summary of the invention

[0007] The purpose of the present invention is to provide a method for detecting the strength of an anti-mud sacrificial agent in inhibiting the adsorption of clay minerals, so as to solve the technical problem that there is a lack of a method for quantitatively evaluating the anti-mud sacrificial agent in inhibiting the adsorption of clay minerals in concrete and machine-made sand manufacturing enterprises in the prior art.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The present invention provides a method for detecting the strength of the anti-mud sacrificial agent in inhibiting the adsorption of clay minerals, comprising the following steps:

[0010] S1. Prepare a methylene blue solution with a mass fraction of ρ of 5 to 15 g / L;

[0011] S2. Weigh standard sand and clay minerals and mix them evenly. The mass of standard sand is m1, in kg; the mass of clay minerals is m2, in g. The mass fraction of clay minerals in standard sand is expressed as the following formula (1):

[0012] S = m2 / m1 (1);

[0013] S is 2-10 g / Kg;

[0014] S3, prepare an anti-mud sacrificial agent solution with deionized water, wherein the mass of the deionized water is 8% to 20% of the mass of the standard sand, and the mass m3 of the anti-mud sacrificial agent is 10% to 90% of its saturated addition amount;

[0015] S4, pouring the anti-mud sacrificial agent solution in step S3 into a mortar mixing pot, using a planetary mortar mixer for slow stirring (the mixer complies with the industry standard JC / T 681-2005), the slow stirring speed is 140±5r / min of rotation and 62±5r / min of revolution, and adding the mixture of standard sand and clay mineral in step S2 into the mortar mixing pot evenly within 30 to 60 seconds, and continuing stirring for 20 to 40 seconds to obtain a mixture;

[0016] S5, drying the mixture in step S4 to obtain pre-treated machine-made sand;

[0017] S6, mixing and stirring the pretreated machine-made sand and distilled water to prepare a suspension; the mass of the pretreated machine-made sand is m4, and the mass ratio of the pretreated machine-made sand to the distilled water is 150-250:450-550;

[0018] S7, add 4-6 ml of the methylene blue solution prepared in step S1 to the suspension in step S6 under stirring, stir for 40-60 seconds, and then use a glass rod to dip a drop of the suspension onto filter paper; if no color halo appears around the precipitate, continue to add 4-6 ml of the methylene blue solution until a color halo of 0.5-1.5 mm appears around the precipitate; after the color halo appears, continue to stir and use a glass rod to dip a drop of the suspension onto filter paper every 40-60 seconds; if the color halo disappears within 5 minutes, continue to add 1-2 ml of the methylene blue solution until a color halo that is stable and does not disappear for 5 minutes appears, and record the total amount V of the methylene blue solution added, V is measured in ml;

[0019] S8. The methylene blue value of the anti-mud sacrificial agent to be tested is calculated using the following formula (2):

[0020] MB1=ρ*V / m4 (2);

[0021] The unit of MB1 is g / Kg; it represents the mass of methylene blue consumed per kilogram of pre-treated machine-made sand in step S5 when the anti-mud sacrificial agent m3 to be tested is added under S conditions;

[0022] S9, repeating steps S1 to S8, and adding only deionized water in step S3, and obtaining a reference methylene blue value MB2, where the unit of MB2 is g / Kg; it represents the mass of methylene blue consumed per kilogram of pre-treated machine-made sand in step S5 under the S condition;

[0023] S10, the calibration value of the anti-mud sacrificial agent's ability to inhibit clay mineral adsorption is recorded as P, which is expressed by the following formula (3):

[0024] P = MB2-MB1 (3);

[0025] It indicates how much the mass of methylene blue consumed by the pre-treated machine-made sand in step S5 decreases when m3 of the anti-mud sacrificial agent to be tested is added under S conditions; the larger the P value, the better the ability of the anti-mud sacrificial agent to inhibit the adsorption of clay minerals, and the smaller the P value, the worse the ability of the anti-mud sacrificial agent to inhibit the adsorption of clay minerals.

[0026] Furthermore, in step S1, the preparation method of the methylene blue solution is: drying the methylene blue powder at 95-105° C. to constant weight, placing it in a dryer to naturally cool to room temperature, and then configuring it into a 5-15 g / L methylene blue solution.

[0027] Furthermore, in step S2, the clay mineral is montmorillonite, kaolin or illite.

[0028] Furthermore, in step S5, the drying temperature is 60-80°C, the drying time is 12-24 hours, and the dough is turned during the drying process.

[0029] Furthermore, the turning time is once within 1 to 2 hours after the start of drying, and the second turning is performed within 3 to 4 hours after the start of drying.

[0030] Furthermore, in step S6, an impeller stirrer is used for stirring at a speed of 540 to 660 rpm for 4 to 6 minutes to prepare a suspension.

[0031] Furthermore, in step S6, the mass m4 of the pre-treated machine-made sand is 150-250 g, and the mass of the distilled water is 450-550 g.

[0032] Furthermore, in step S7, stirring is performed using an impeller stirrer with a rotation speed of 360 to 440 rpm.

[0033] Based on the above technical solution, the embodiments of the present invention can at least produce the following technical effects:

[0034] (1) The present invention provides a method for detecting the strength of the anti-mud sacrificial agent in inhibiting the adsorption of clay minerals. The clay mineral, standard sand, and anti-mud sacrificial agent are pretreated so that the anti-mud sacrificial agent can fully react with the clay mineral. The pretreated standard sand is then tested for a methylene blue value. The difference between the pretreated standard sand and the reference can truly reflect the ability of the anti-mud sacrificial agent to inhibit the adsorption of clay minerals, thereby detecting the strength of the anti-mud sacrificial agent in inhibiting the adsorption of clay minerals. If the anti-mud sacrificial agent is directly added dropwise during the methylene blue value test phase without the steps described in the invention, the anti-mud sacrificial agent and the methylene blue solution will compete for adsorption on the clay mineral. The methylene blue will occupy the adsorption sites on the clay mineral, affecting the adsorption of the anti-mud sacrificial agent on the clay mineral, resulting in an inaccurate reflection of the ability of the anti-mud sacrificial agent to adsorb on the clay mineral, resulting in inaccurate experimental results. However, the detection method of the present invention can avoid the competitive adsorption of the anti-mud sacrificial agent and the methylene blue solution on the clay mineral, and can accurately reflect the ability of the anti-mud sacrificial agent to adsorb on the clay mineral, and the experimental results are highly accurate.

[0035] (2) The present invention provides a method for detecting the strength of the anti-mud sacrificial agent in inhibiting the adsorption of clay minerals. The reagents and instruments used are all common items in the field of building materials. The test operation is simple and the test cost is low. Therefore, the test method of the present invention has the characteristics of simple operation, low cost and accurate results. It is suitable for evaluating the performance of anti-mud sacrificial agents in scientific research and is also suitable for quality acceptance of anti-mud sacrificial agents by concrete and machine-made sand manufacturers in the building materials industry. DETAILED DESCRIPTION

[0036] 1. Anti-mud sacrificial agent

[0037] The anti-mud sacrificial agent used in the following test examples is a new product developed by Meishan Conch New Material Technology Co., Ltd. The preparation of SCA-1, SCA-2 and SCA-3 is as follows:

[0038] 1. The preparation of anti-mud sacrificial agent SCA-1 includes the following steps:

[0039] S1: Fix a 1000mL three-necked flask with an iron stand, immerse its bottom in a constant temperature water bath, adjust the water bath temperature to 15°C, and install a temperature sensor, an electric stirrer, and a rubber stopper with a tube for titration solution B on the three-necked flask;

[0040] S2: Weigh 60 parts by weight of ethylene glycol monovinyl polyglycol ether and 220 parts by weight of deionized water into a three-necked flask and start stirring;

[0041] S3: Weigh 13 parts by weight of methacryloyloxyethyl trimethyl ammonium chloride, 11 parts by weight of diallyl dimethyl ammonium chloride, 3 parts by weight of styrene, 1 part by weight of ammonium persulfate, 1 part by weight of sodium hypophosphite, and 150 parts by weight of deionized water to prepare solution A, stir well, and add to a three-necked flask;

[0042] S4: Weigh 1 part by weight of ascorbic acid and 40 parts by weight of deionized water to prepare liquid B and stir evenly. When the temperature sensor stably displays the temperature at 15±1°C, start dripping liquid B for 150 minutes;

[0043] S5: After the addition of liquid B is completed, the mixture is kept warm and stirred for 60 minutes. After cooling to room temperature, the sample is separated using 3000 and 8000 cellulose dialysis bags to obtain an anti-mud sacrificial agent, which is numbered SCA-1.

[0044] 2. The preparation of anti-mud sacrificial agent SCA-2 includes the following steps:

[0045] S1: Fix a 1000mL three-necked flask with an iron stand, immerse its bottom in a constant temperature water bath, adjust the water bath temperature to 15°C, and install a temperature sensor, an electric stirrer, and a rubber stopper with a tube for titration solution B on the three-necked flask;

[0046] S2: Weigh 80 parts by weight of methyl allyl polyoxyethylene ether and 200 parts by weight of deionized water into a three-necked flask and start stirring;

[0047] S3: Weigh 12 parts by weight of methacryloyloxyethyl trimethyl ammonium chloride, 10 parts by weight of diallyl dimethyl ammonium chloride, 5 parts by weight of styrene, 1 part by weight of ammonium persulfate, 1 part by weight of sodium hypophosphite, and 150 parts by weight of deionized water to prepare solution A, stir well, and add to a three-necked flask;

[0048] S4: Weigh 1 part by weight of ascorbic acid and 40 parts by weight of deionized water to prepare liquid B and stir evenly. When the temperature sensor stably displays the temperature at 15±1°C, start dripping liquid B for 150 minutes;

[0049] S5: After the addition of liquid B is completed, the mixture is kept warm and stirred for 60 minutes. After cooling to room temperature, the sample is separated using 3000 and 8000 cellulose dialysis bags to obtain an anti-mud sacrificial agent, which is numbered SCA-2.

[0050] 3. The preparation of anti-mud sacrificial agent SCA-3 includes the following steps:

[0051] S1: Fix a 1000mL three-necked flask with an iron stand, immerse its bottom in a constant temperature water bath, adjust the water bath temperature to 15°C, and install a temperature sensor, an electric stirrer, and a rubber stopper with a tube for titration solution B on the three-necked flask;

[0052] S2: Weigh 100 parts by weight of 4-hydroxybutyl vinyl polyoxyethylene ether and 180 parts by weight of deionized water into a three-necked flask and start stirring;

[0053] S3: Weigh 11 parts by weight of methacryloyloxyethyl trimethyl ammonium chloride, 9 parts by weight of diallyl dimethyl ammonium chloride, 7 parts by weight of styrene, 1 part by weight of ammonium persulfate, 1 part by weight of sodium hypophosphite, and 150 parts by weight of deionized water to prepare solution A, stir well, and add to a three-necked flask;

[0054] S4: Weigh 1 part by weight of ascorbic acid and 40 parts by weight of deionized water to prepare liquid B and stir evenly. When the temperature sensor stably displays the temperature at 15±1°C, start dripping liquid B for 150 minutes;

[0055] S5: After the addition of liquid B is completed, the mixture is kept warm and stirred for 60 minutes. After cooling to room temperature, the sample is separated using 3000 and 8000 cellulose dialysis bags to obtain an anti-mud sacrificial agent, which is numbered SCA-3.

[0056] 2. Detection Example:

[0057] (I) Group 1:

[0058] Example 1

[0059] Testing the ability of the anti-mud sacrificial agent SCA-1 to inhibit the adsorption of clay minerals includes the following steps:

[0060] S1, drying the methylene blue powder at 100°C to constant weight, placing it in a desiccator and naturally cooling it to room temperature, and then preparing a methylene blue solution with a mass fraction ρ of 10 g / L;

[0061] S2, weigh standard sand and clay mineral and mix them evenly, the clay mineral is montmorillonite; the mass m1 of standard sand is 1 kg; the mass m2 of clay mineral is 5 g; the mass fraction of clay mineral in standard sand is expressed as: S = 5 / 1; that is, S is 5 g / kg;

[0062] S3, 1g of the anti-mud sacrificial agent SCA-1 to be tested is mixed with 100g of deionized water to prepare an anti-mud sacrificial agent solution, wherein the mass of the deionized water is 10% of the mass of the standard sand;

[0063] S4, pouring the anti-mud sacrificial agent solution in step S3 into a mortar mixing pot, using a planetary mortar mixer for slow stirring (the mixer complies with the industry standard JC / T 681-2005), the slow stirring speed is 140r / min for rotation and 62r / min for revolution, and adding the mixture of standard sand and clay mineral in step S2 evenly into the mortar mixing pot within 30 to 40s, and continuing stirring for 30s to obtain a mixture;

[0064] S5, drying the mixture in step S4, the drying temperature is 60 ° C, the drying time is 12 hours, and the mixture is turned over during the drying process; the turning time is once every 1 hour after the start of drying, and the second turning is performed 3 hours after the start of drying, and the pre-treated machine-made sand is obtained after drying;

[0065] S6. Weigh the pre-treated machine-made sand and distilled water, the mass m4 of the pre-treated machine-made sand is 200 g, and the mass of the distilled water is 500 g; mix and stir the pre-treated machine-made sand and distilled water, using an impeller stirrer to stir at a speed of 600 rpm for 5 minutes to form a suspension; and then continue to stir at a speed of 400 rpm;

[0066] S7, keeping the stirring speed at 400rpm, adding 5ml of the methylene blue solution prepared in step S1 to the suspension in step S6, stirring for 60 seconds, and then using a glass rod to dip a drop of the suspension onto filter paper; if no color halo appears around the precipitate, continue to add 5ml of methylene blue solution until a color halo of 0.5-1.5mm appears around the precipitate; after the color halo appears, continue to stir and use a glass rod to dip a drop of the suspension onto filter paper every 60 seconds; if the color halo disappears within 5min, continue to add 2ml of methylene blue solution until a color halo that is stable and does not disappear for 5min appears, and record the total amount V1 of the methylene blue solution added, V1 is measured in ml;

[0067] S8. Calculate the methylene blue value of the anti-mud sacrificial agent to be tested: MB1 A-(SCA-1) =ρ*V1 / m4=10*V1 / 200=V1 / 20;

[0068] MB1 A-(SCA-1)The unit is g / Kg; it represents the mass of methylene blue consumed per kilogram of pre-treated machine-made sand in step S5 when m3 of the anti-mud sacrificial agent to be tested is added when S is 5g / Kg;

[0069] S9, repeat steps S1 to S8, and in step S3, only add deionized water, and record the total amount of methylene blue solution added V A , V A In ml; and obtain the reference methyl blue value MB2, MB2 A =ρ*V A / m4=10*V A / 200 = V A / 20,MB2 A The unit is g / Kg; it represents the mass of methylene blue consumed per kilogram of pre-treated machine-made sand in step S5 when S is 5g / Kg;

[0070] S10, the calibration value of the anti-mud sacrificial agent's ability to inhibit the adsorption of clay minerals is recorded as P1, expressed as: P1 = MB2 A -MB1 A-(SCA-1) ;

[0071] It indicates how much the mass of methylene blue consumed in the pre-treated machine-made sand in step S5 decreases when m3 of the anti-mud sacrificial agent to be tested is added when S is 5g / Kg.

[0072] Embodiment 2:

[0073] Detect the strength of the anti-mud sacrificial agent SCA-2 in inhibiting the adsorption of clay minerals:

[0074] Replace the anti-mud sacrificial agent SCA-1 with the anti-mud sacrificial agent SCA-2, repeat steps S1 to S8 in Example 1, and record the total amount V2 of the added methylene blue solution, V2 is measured in ml;

[0075] Calculate the methylene blue value of the anti-mud sacrificial agent to be tested: MB1 A-(SCA-2) =ρ*V2 / m4=10*V2 / 200=V2 / 20;

[0076] In this embodiment, the reference methyl blue value MB2 in step S9 A The acquisition is the same as in Example 1 and will not be repeated;

[0077] Repeat step S10 in Example 1, and the calibration value of the anti-mud sacrificial agent's ability to inhibit clay mineral adsorption is recorded as P2, expressed as: P2 = MB2 A -MB1 A-(SCA-2) .

[0078] Embodiment 3:

[0079] Detect the strength of the anti-mud sacrificial agent SCA-3 in inhibiting the adsorption of clay minerals:

[0080] Replace the anti-mud sacrificial agent SCA-1 with the anti-mud sacrificial agent SCA-3, repeat steps S1 to S8 in Example 1, and record the total amount V3 of the added methylene blue solution, V3 in ml;

[0081] Calculate the methylene blue value of the anti-mud sacrificial agent to be tested: MB1 SCA-3 (g / Kg)=ρ*V3 / m4=10*V3 / 200=V3 / 20;

[0082] In this embodiment, the reference methyl blue value MB2 in step S9 A The acquisition is the same as in Example 1 and will not be repeated;

[0083] Repeat step S10 in Example 1, and the calibration value of the anti-mud sacrificial agent's ability to inhibit clay mineral adsorption is recorded as P3, expressed as: P3 = MB2 A -MB1 A-(SCA-3) .

[0084] (ii) Group 2:

[0085] Embodiment 4:

[0086] Testing the ability of the anti-mud sacrificial agent SCA-1 to inhibit the adsorption of clay minerals includes the following steps:

[0087] S1, drying the methylene blue powder at 105°C to constant weight, placing it in a desiccator to naturally cool to room temperature, and then preparing a methylene blue solution with a mass fraction ρ of 15 g / L;

[0088] S2, weigh standard sand and clay mineral and mix them evenly, the clay mineral is kaolin; the mass m1 of standard sand is 1 kg; the mass m2 of clay mineral is 10 g; the mass fraction of clay mineral in standard sand is expressed as: S = m2 / m1; that is, S is 10 g / kg;

[0089] S3, 1g of the anti-mud sacrificial agent SCA-1 to be tested is mixed with 200g of deionized water to prepare an anti-mud sacrificial agent solution, wherein the mass of the deionized water is 20% of the mass of the standard sand;

[0090] S4, pouring the anti-mud sacrificial agent solution in step S3 into a mortar mixing pot, using a planetary mortar mixer for slow stirring (the mixer complies with the industry standard JC / T 681-2005), the slow stirring speed is 145r / min of rotation and 67r / min of revolution, and the mixture of standard sand and clay mineral in step S2 is evenly added into the mortar mixing pot within 50 to 60s, and stirring is continued for 40s to obtain a mixture;

[0091] S5, drying the mixture in step S4 at a drying temperature of 80°C for 18 hours, and turning it during the drying process; turning it once every 1.5 hours after the start of drying, and turning it a second time 3.5 hours after the start of drying, and obtaining pre-treated machine-made sand after drying;

[0092] S6. Weigh pretreated machine-made sand and distilled water, the mass m4 of the pretreated machine-made sand is 250 g, and the mass of the distilled water is 550 g; mix and stir the pretreated machine-made sand and distilled water, using an impeller stirrer, stirring at a speed of 660 rpm for 4 minutes to prepare a suspension; and then continue stirring at a speed of 440 rpm;

[0093] S7, keeping the stirring speed at 440rpm, add 6ml of the methylene blue solution prepared in step S1 to the suspension in step S6, stir for 50 seconds, take a drop of the suspension with a glass rod and drop it on the filter paper; if no color halo appears around the precipitate, continue to add 6ml of methylene blue solution until a color halo of 0.5-1.5mm appears around the precipitate; after the color halo appears, continue to stir and take a drop of the suspension with a glass rod every 50 seconds and drop it on the filter paper; if the color halo disappears within 5min, continue to add 1ml of methylene blue solution until a color halo that is stable and does not disappear for 5min appears, and record the total amount V4 of the methylene blue solution added, V4 is measured in ml;

[0094] S8. Calculate the methylene blue value of the anti-mud sacrificial agent to be tested: MB1 B-(SCA-1) =ρ*V4 / m4=15*V4 / m4;

[0095] MB1 B-(SCA-1) The unit is g / Kg; it represents the mass of methylene blue consumed per kilogram of pre-treated machine-made sand in step S5 when m3 of the anti-mud sacrificial agent to be tested is added when S is 10g / Kg;

[0096] S9, repeat steps S1 to S8, and in step S3, only add deionized water, and record the total amount of methylene blue solution added V B , V B In ml; and obtain the reference methyl blue value MB2 B , MB2 B =ρ*V B / m4=15*V B / 250,MB2 B The unit is g / Kg; it represents the mass of methylene blue consumed per kilogram of pre-treated machine-made sand in step S5 when S is 10g / Kg;

[0097] S10, the calibration value of the anti-mud sacrificial agent's ability to inhibit the adsorption of clay minerals is recorded as P4, expressed as: P4 = MB2 B -MB1 B-(SCA-1) ;

[0098] It indicates how much the mass of methylene blue consumed in the pre-treated machine-made sand in step S5 decreases when m3 of the anti-mud sacrificial agent to be tested is added when S is 2g / Kg.

[0099] Embodiment 5:

[0100] Detect the strength of the anti-mud sacrificial agent SCA-2 in inhibiting the adsorption of clay minerals:

[0101] Replace the anti-mud sacrificial agent SCA-1 with the anti-mud sacrificial agent SCA-2, repeat steps S1 to S8 in Example 4, and record the total amount V5 of the added methylene blue solution, V5 in ml;

[0102] Calculate the methylene blue value of the anti-mud sacrificial agent to be tested: MB1 B-(SCA-2) (g / Kg)=ρ*V5 / m4=15*V5 / 250;

[0103] In this embodiment, the reference methyl blue value MB2 in step S9 B The acquisition is the same as in Example 4 and will not be repeated;

[0104] Repeat step S10 in Example 4, and the calibration value of the anti-mud sacrificial agent's ability to inhibit clay mineral adsorption is recorded as P5, expressed as: P5 = MB2 B -MB1 B-(SCA-2) .

[0105] Embodiment 6:

[0106] Detect the strength of the anti-mud sacrificial agent SCA-3 in inhibiting the adsorption of clay minerals:

[0107] Replace the anti-mud sacrificial agent SCA-1 with the anti-mud sacrificial agent SCA-3, repeat steps S1 to S8 in Example 4, and record the total amount V6 of the added methylene blue solution, V6 in ml;

[0108] Calculate the methylene blue value of the anti-mud sacrificial agent to be tested: MB1 B-(SCA-3) (g / Kg)=ρ*V6 / m4=15*V6 / 250;

[0109] In this embodiment, the reference methyl blue value MB2 in step S9 B The acquisition is the same as in Example 4 and will not be repeated;

[0110] Repeat step S10 in Example 4, and the calibration value of the anti-mud sacrificial agent's ability to inhibit clay mineral adsorption is recorded as P6, expressed as: P6 = MB2 B -MB1 B-(SCA-3) .

[0111] (III) Group 3:

[0112] Embodiment 7:

[0113] Testing the ability of the anti-mud sacrificial agent SCA-1 to inhibit the adsorption of clay minerals includes the following steps:

[0114] S1, drying the methylene blue powder at 95°C to constant weight, placing it in a desiccator to naturally cool to room temperature, and then preparing a methylene blue solution with a mass fraction ρ of 5 g / L;

[0115] S2, weigh standard sand and clay mineral and mix them evenly, the clay mineral is illite; the mass m1 of standard sand is 1 kg; the mass m2 of clay mineral is 2 g; the mass fraction of clay mineral in standard sand is expressed as: S = m2 / m1; that is, S is 2 g / kg;

[0116] S3, 1g of the anti-mud sacrificial agent SCA-1 to be tested is mixed with 80g of deionized water to prepare an anti-mud sacrificial agent solution, wherein the mass of the deionized water is 8% of the mass of the standard sand;

[0117] S4, pouring the anti-mud sacrificial agent solution in step S3 into a mortar mixing pot, using a planetary mortar mixer for slow stirring (the mixer complies with the industry standard JC / T 681-2005), the slow stirring speed is 135r / min for rotation and 57r / min for revolution, and the mixture of standard sand and clay mineral in step S2 is evenly added into the mortar mixing pot within 40-50s, and stirring is continued for 20s to obtain a mixture;

[0118] S5, drying the mixture in step S4, the drying temperature is 60 ° C, the drying time is 24h, and the mixture is turned over during the drying process; the turning time is 2h after the start of drying, and the second turning is performed 4h after the start of drying, and the pre-treated machine-made sand is obtained after drying;

[0119] S6. Weigh the pretreated machine-made sand and distilled water. The mass m4 of the pretreated machine-made sand is 150 g, and the mass of the distilled water is 450 g. Mix and stir the pretreated machine-made sand and the distilled water. The stirring is carried out using an impeller stirrer at a speed of 540 rpm for 6 minutes to prepare a suspension. The mass of the pretreated machine-made sand is m4, and the mass ratio of the pretreated machine-made sand to the distilled water is 150-250:450-550. Then continue stirring at a speed of 360 rpm.

[0120] S7, keeping the stirring speed at 360rpm, add 4ml of the methylene blue solution prepared in step S1 to the suspension in step S6, stir for 40 seconds, take a drop of the suspension with a glass rod and drop it on the filter paper; if no color halo appears around the precipitate, continue to add 4ml of methylene blue solution until a color halo of 0.5-1.5mm appears around the precipitate; after the color halo appears, continue to stir and take a drop of the suspension with a glass rod and drop it on the filter paper every 40-60 seconds; if the color halo disappears within 5min, continue to add 2ml of methylene blue solution until a color halo that is stable and does not disappear for 5min appears, and record the total amount of methylene blue solution added V7, V7 is measured in ml;

[0121] S8. Calculate the methylene blue value of the anti-mud sacrificial agent to be tested, expressed as: MB1 C-(SCA-1) =ρ*V7 / m4=5*V7 / 150;

[0122] MB1 C-(SCA-1) The unit is g / Kg; it represents the mass of methylene blue consumed per kilogram of pre-treated machine-made sand in step S5 when m3 of the anti-mud sacrificial agent to be tested is added when S is 2g / Kg;

[0123] S9, repeat steps S1 to S8, and in step S3, only add deionized water, and record the total amount of methylene blue solution added V C , V C In ml; and obtain the reference methyl blue value MB2 C , MB2 C =ρ*V C / m4=5*V C / 150,MB2 C The unit is g / Kg; it represents the mass of methylene blue consumed per kilogram of pre-treated machine-made sand in step S5 when S is 2g / Kg;

[0124] S10, the calibration value of the anti-mud sacrificial agent's ability to inhibit the adsorption of clay minerals is recorded as P7, expressed as: P7 = MB2 C -MB1 C-(SCA-1) ;

[0125] It indicates how much the mass of methylene blue consumed in the pre-treated machine-made sand in step S5 decreases when m3 of the anti-mud sacrificial agent to be tested is added when S is 2g / Kg.

[0126] Embodiment 8:

[0127] Detect the strength of the anti-mud sacrificial agent SCA-2 in inhibiting the adsorption of clay minerals:

[0128] Replace the anti-mud sacrificial agent SCA-1 with the anti-mud sacrificial agent SCA-2, repeat steps S1 to S8 in Example 7, and record the total amount V8 of the added methylene blue solution, V8 in ml;

[0129] Calculate the methylene blue value of the anti-mud sacrificial agent to be tested: MB1 C-(SCA-2) (g / Kg)=ρ*V8 / m4=5*V8 / 150;

[0130] In this embodiment, the reference methyl blue value MB2 in step S9 C The acquisition is the same as in Example 7 and will not be repeated;

[0131] Repeat step S10 in Example 7, and the calibration value of the anti-mud sacrificial agent's ability to inhibit clay mineral adsorption is recorded as P8, expressed as: P8 = MB2 C -MB1 C-(SCA-2) .

[0132] Embodiment 9:

[0133] Detect the strength of the anti-mud sacrificial agent SCA-3 in inhibiting the adsorption of clay minerals:

[0134] Replace the anti-mud sacrificial agent SCA-1 with the anti-mud sacrificial agent SCA-3, repeat steps S1 to S8 in Example 7, and record the total amount V9 of the added methylene blue solution, V9 in ml;

[0135] Calculate the methylene blue value of the anti-mud sacrificial agent to be tested: MB1 C-(SCA-3) (g / Kg)=ρ*V9 / m4=5*V9 / 150;

[0136] In this embodiment, the reference methyl blue value MB2 in step S9 B The acquisition is the same as in Example 7 and will not be repeated;

[0137] Repeat step S10 in Example 7, and the calibration value of the anti-mud sacrificial agent's ability to inhibit clay mineral adsorption is recorded as P9, expressed as: P9 = MB2 C -MB1 C-(SCA-3) .

[0138] At the same time, the samples without anti-mud sacrificial agent were used as reference samples (in step S4, the sacrificial agent solution was replaced with an equal volume of deionized water). The detection method of the first group of reference samples was the same as that of Example 1; the detection method of the second group of reference samples was the same as that of Example 4; the detection method of the third group of reference samples was the same as that of Example 7. The test results of the anti-mud sacrificial agent performance of the reference samples and Examples 1-9 are shown in Table 1 below:

[0139] Table 1 Anti-mud sacrificial agent performance test results

[0140]

[0141] 3. Experimental Examples

[0142] According to GBT8077-2012 "Test Methods for Concrete Admixtures", the SCA-1, SCA-2 and SCA-3 agents were tested for their pure paste fluidity. The reference sample was the one without adding anti-mud sacrifice. The cement used was Conch Cement P·O42.5 cement, with a water-cement ratio of 0.29. Each sample was prepared as a 5% mass fraction solution and 6g was added. The amount of bentonite added was 1% of the weight of the cement, that is, 297g cement + 3g bentonite. The test results of cement pure paste fluidity are shown in Table 2.

[0143] Table 2 Test results of fluidity of anti-mud sacrificial agent mortar

[0144]

[0145] It can be seen from Table 1 and Table 2 that the P value indicates the ability of each anti-mud sacrificial agent to inhibit the adsorption of clay minerals, which is consistent with the test of macroscopic performance. Both tests show that the inhibition ability of the three anti-mud sacrificial agent samples is SCA-3>SCA-2>SCA-1. At the same time, the fluidity of the mortar can only show the relative strength of the inhibition ability of the three anti-mud sacrificial agents, and it is impossible to show the absolute size of their inhibition ability from the data. Using the method of the present invention, the absolute value of two or more anti-mud sacrificial agents can be explained by comparing the size of the P value, which is more conducive to R&D personnel to study the essential law of the inhibition performance of anti-mud sacrificial agents.

Claims

1. A method for detecting the strength of an anti-mud sacrificial agent in inhibiting the adsorption of clay minerals, characterized in that: The steps include: S1. Prepare a methylene blue solution with a mass fraction of ρ of 5 to 15 g / L; S2. Weigh standard sand and clay minerals and mix them evenly. The mass of standard sand is m1, in kg; the mass of clay minerals is m2, in g. The mass fraction of clay minerals in standard sand is expressed as the following formula (1): S=m2 / m1 (1); S is 2-10 g / Kg; S3, prepare an anti-mud sacrificial agent solution with deionized water, wherein the mass of the deionized water is 8% to 20% of the mass of the standard sand, and the mass m3 of the anti-mud sacrificial agent is 10% to 90% of its saturated addition amount; S4, pouring the anti-mud sacrificial agent solution in step S3 into a mortar stirring pot, stirring slowly, adding the mixture of standard sand and clay mineral in step S2 evenly into the mortar stirring pot within 30 to 60 seconds, and continuing to stir for 20 to 40 seconds to obtain a mixture; S5, drying the mixture in step S4 to obtain pre-treated machine-made sand; S6, mixing and stirring the pretreated machine-made sand and distilled water to prepare a suspension; The mass of pre-treated machine-made sand is m4, and the mass ratio of pre-treated machine-made sand to distilled water is 150-250:450-550; S7, add 4-6 ml of the methylene blue solution prepared in step S1 to the suspension in step S6 under stirring, stir for 40-60 seconds, and then use a glass rod to dip a drop of the suspension onto filter paper; if no color halo appears around the precipitate, continue to add 4-6 ml of the methylene blue solution until a color halo of 0.5-1.5 mm appears around the precipitate; after the color halo appears, continue to stir and use a glass rod to dip a drop of the suspension onto filter paper every 40-60 seconds; if the color halo disappears within 5 minutes, continue to add 1-2 ml of the methylene blue solution until a color halo that is stable and does not disappear for 5 minutes appears, and record the total amount V of the methylene blue solution added, V is measured in ml; S8. Calculate the methylene blue value of the anti-mud sacrificial agent to be tested using the following formula (2): MB1=ρ*V / m4 (2); The unit of MB1 is g / Kg; it represents the mass of methylene blue consumed per kilogram of pre-treated machine-made sand in step S5 when the anti-mud sacrificial agent m3 to be tested is added under S conditions; S9, repeating steps S1 to S8, and adding only deionized water in step S3, and obtaining a reference methylene blue value MB2, where the unit of MB2 is g / Kg; it represents the mass of methylene blue consumed per kilogram of pre-treated machine-made sand in step S5 under the S condition; S10, the calibration value of the anti-mud sacrificial agent's ability to inhibit clay mineral adsorption is recorded as P, which is expressed by the following formula (3): P = MB2-MB1 (3); It indicates how much the mass of methylene blue consumed by the pre-treated machine-made sand in step S5 decreases when m3 of the anti-mud sacrificial agent to be tested is added under S conditions; the larger the P value, the better the ability of the anti-mud sacrificial agent to inhibit the adsorption of clay minerals, and the smaller the P value, the worse the ability of the anti-mud sacrificial agent to inhibit the adsorption of clay minerals.

2. The method for detecting the strength of the anti-mud sacrificial agent in inhibiting the adsorption of clay minerals according to claim 1, characterized in that: In step S1, the methylene blue solution is prepared by drying the methylene blue powder at 95-105° C. to a constant weight, placing the powder in a dryer to naturally cool to room temperature, and then preparing a 5-15 g / L methylene blue solution.

3. The method for detecting the strength of the anti-mud sacrificial agent in inhibiting the adsorption of clay minerals according to claim 1, characterized in that: In the step S2, the clay mineral is montmorillonite, kaolin or illite.

4. The method for detecting the strength of the anti-mud sacrificial agent in inhibiting the adsorption of clay minerals according to claim 1, characterized in that: In step S5, the drying temperature is 60-80° C., the drying time is 12-24 hours, and the dough is turned during the drying process.

5. The method for detecting the strength of the anti-mud sacrificial agent in inhibiting the adsorption of clay minerals according to claim 4, characterized in that: The turning time is once within 1 to 2 hours after the start of drying, and the second turning is done within 3 to 4 hours after the start of drying.

6. The method for detecting the strength of the anti-mud sacrificial agent in inhibiting the adsorption of clay minerals according to claim 1, characterized in that: In the step S6, an impeller stirrer is used for stirring at a rotation speed of 540 to 660 rpm for 4 to 6 minutes to prepare a suspension.

7. The method for detecting the strength of the anti-mud sacrificial agent in inhibiting the adsorption of clay minerals according to claim 1, characterized in that: In the step S6, the mass m4 of the pre-treated machine-made sand is 150-250 g, and the mass of the distilled water is 450-550 g.

8. The method for detecting the strength of the anti-mud sacrificial agent in inhibiting the adsorption of clay minerals according to claim 7, characterized in that: In step S7, an impeller stirrer is used for stirring at a rotation speed of 360 to 440 rpm.

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