Method for rapidly measuring silt content of fine aggregate and tool for measuring silt content of fine aggregate

Abstract

The invention discloses a method and tool for rapidly measuring the silt content of fine aggregate, and belongs to the technical field of constructional engineering.The method comprises the steps that a wet fine aggregate sample with the first mass is weighed; adding a first mass of the wet fine aggregate sample and a second mass of water into the test bottle, enabling the mixture of the water and the fine aggregate to reach the marking line position of the test bottle, and weighing the total mass of the mixture before cleaning; based on the total mass of the mixture before cleaning and the linear relation between the mass change of the fine aggregate and the total mass change of the mixture, the mass of the dry fine aggregate before cleaning is calculated; filtering and cleaning the mixture for multiple times, and weighing the total mass of the cleaned mixture; calculating the mass of the cleaned dry fine aggregate based on the total mass of the cleaned mixture and the linear relationship between the mass change of the fine aggregate and the total mass change of the mixture; and calculating the silt content based on the mass of the dry fine aggregate before cleaning and the mass of the dry fine aggregate after cleaning. According to the scheme, the silt content detection time of the fine aggregate can be greatly shortened.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a quick measurement method for fine aggregate mud content and a measurement tool for the fine aggregate mud content. Background Art

[0002] Fine aggregate refers to sand particles with smaller particle size used in concrete, and its particle size is generally less than 4.75mm. The main function of fine aggregate is to fill the gaps between coarse aggregates and improve the strength and durability of concrete. The mud content of fine aggregate refers to particles smaller than 0.075mm in fine aggregate. As the mud content increases, the compressive strength of concrete will decrease and the impermeability will also deteriorate.

[0003] At present, the detection methods for the mud content of fine aggregate mainly include drying method, screening method, laser particle size analysis method, etc. For example, the detection process for the particle content of particles less than 0.075mm in the aggregate is divided into the following steps: 1. Weigh the sample after drying; 2. Place it in a container and soak it in water for 24 hours; 3. Wash the particles manually to separate the particles from the aggregate itself, suspend it in water, and slowly pour the suspension into 2.36mm, 1.18mm and 0.075mm sieves in turn for filtration; 4. Repeat step 3 until the washed water is clear; 5. Rinse the fine particles remaining on the sieve with water to fully remove particles less than 0.075mm; 6. Place it in a 105℃±5℃ oven to dry to constant weight, then take it out and cool it to room temperature, and weigh the sample mass; 7. The mass difference is the percentage of the drying mass before the test. This method takes a long time to detect in field applications, and cannot meet the needs of quickly obtaining mud content detection results, which seriously delays the progress of concrete production. Summary of the invention

[0004] In order to reduce the on-site detection time of fine aggregate mud content, this scheme proposes a rapid measurement method and a measurement tool for fine aggregate mud content. By measuring the mass change of fine aggregate before and after washing and calculating the mud content based on the linear relationship between the fine aggregate mass change and the total mass change, the test time can be greatly shortened, which is easy to implement on-site and helps to adjust the selection of building materials in time.

[0005] According to a first aspect of the present invention, there is provided a method for rapidly measuring the mud content of fine aggregate, comprising: weighing a first mass of a wet fine aggregate sample; adding the first mass of the wet fine aggregate sample and a second mass of water into a test bottle so that the mixture of water and fine aggregate reaches the mark line position of the test bottle, and weighing the total mass of the mixture before cleaning; calculating the mass of dry fine aggregate before cleaning based on the total mass of the mixture before cleaning and the linear relationship between the change in the mass of fine aggregate and the change in the total mass of the mixture; filtering and cleaning the mixture multiple times, and weighing the total mass of the washed mixture; calculating the mass of dry fine aggregate after cleaning based on the total mass of the washed mixture and the linear relationship between the change in the mass of fine aggregate and the change in the total mass of the mixture; and calculating the mud content based on the mass of dry fine aggregate before cleaning and the mass of dry fine aggregate after cleaning.

[0006] By adopting the above technical solution, based on the linear relationship between the change in fine aggregate mass and the change in total mass, the measurement accuracy can be improved and human errors can be reduced. Through direct weighing and linear relationship calculation, the results can be obtained quickly, saving measurement time, and the quality of fine aggregate can be quickly evaluated on site, which is convenient for quality control during the construction process.

[0007] Optionally, in the rapid measurement method for the mud content of fine aggregate provided by the present invention, water with a volume of 1 / 3 of the bottle volume is added to the test bottle, and then a first mass of wet fine aggregate sample is added; the test bottle is rotated or shaken and water is continued to be added to the mark line position of the test bottle, and the total mass of the water and fine aggregate mixture is weighed.

[0008] By adopting the above technical solution, the water level is controlled by the marking line to avoid changes in the quality of the mixture caused by excessive addition of water. It does not require complicated equipment and operations, and is convenient for rapid on-site testing.

[0009] Optionally, in the rapid measurement method for fine aggregate mud content provided by the present invention, the temperature change of water before and after the test does not exceed 2°C.

[0010] In the above technical solution, temperature control helps to maintain consistency in test conditions and reduces the impact of changes in water density on quality measurement.

[0011] Optionally, in the rapid measurement method for the mud content of fine aggregate provided by the present invention, a linear relationship between the change in the mass of fine aggregate and the change in the total mass of the mixture is fitted before the test; based on the total mass of the mixture before cleaning and the intercept and slope of the linear relationship, the mass of dry fine aggregate before cleaning is calculated.

[0012] According to the above technical scheme, the mass of dry fine aggregate can be quickly derived through linear relationship fitting, which reduces the complexity of direct measurement and maximizes the validity of the data by utilizing the relationship between the total mass of the mixture and the mass of fine aggregate.

[0013] Optionally, in the rapid measurement method for the mud content of fine aggregate provided by the present invention, a volumetric flask is selected, and the mass of water is weighed when the water is filled to the mark line of the volumetric flask, and the volume of water is calculated based on the mass and relative density of water. At this time, the volume of water is the total volume of the mixture, and the volumetric flask and the test bottle are the same container; three masses of dry fine aggregate samples are set, and the volumes of the three samples are respectively calculated based on the mass and apparent density of the dry fine aggregate samples; based on the total volume of the mixture and the volumes of the three samples, the volume and mass of water in the mixture are respectively calculated; the calculated mass of water and the mass of the three samples are respectively summed to calculate the total mass of the mixture of the three samples and water; With the total mass of the mixture as the x-axis and the mass of the dry fine aggregate sample as the y-axis, the linear relationship between the mass of the mixture and the mass of the dry fine aggregate is obtained: y=ax+b, where y is the mass of the dry fine aggregate sample, x is the total mass of the mixture, a is the slope, and b is the intercept.

[0014] Optionally, in the rapid measurement method for the mud content of fine aggregate provided by the present invention, the first mass is taken as the reference mass and is gradually reduced by 20 g to obtain three masses of dry fine aggregate samples.

[0015] Optionally, in the rapid measurement method for the mud content of fine aggregate provided by the present invention, the mixture in the volumetric flask or the stirring bottle is shaken or rotated to separate the dust, silt, clay and sand in the fine aggregate and suspend them in water to form a turbid liquid; the turbid liquid is poured into a sieve with a minimum sieve hole diameter equal to 0.075 mm for filtration; the steps of adding water, separation and filtration are repeated until the mixture is clean, the sand in the sieve is re-washed and added to the test bottle, and the amount of water in the test bottle is adjusted to the mark line position, and the total mass of the washed mixture is weighed.

[0016] Optionally, in the rapid measurement method for the mud content of fine aggregate provided by the present invention, the mass of dry fine aggregate before cleaning is y1: y1= ax1+ b, and the mass of dry fine aggregate after cleaning is y2: y2= ax2+ b, wherein a and b are the slope and intercept of the linear relationship, respectively, x1 is the total mass of the mixture before cleaning, and x2 is the total mass of the mixture after cleaning.

[0017] Optionally, in the rapid measurement method for fine aggregate mud content provided by the present invention, the formula S is used. n = (y1-y2) / y1× 100% Calculate the mud content, where y1 is the mass of dry fine aggregate before cleaning and y2 is the mass of dry fine aggregate after cleaning.

[0018] According to a second aspect of the present invention, there is provided a measuring tool for the mud content of fine aggregate, comprising: an electronic balance, a volumetric flask, a set of sieves and a computing device; the weighing of the electronic balance is not less than 2000g, and the accuracy is at least 0.05g; the volumetric flask has a capacity of 1000mL and is provided with scale lines; the set of sieves comprises a plurality of sieves with different apertures, and the minimum sieve aperture diameter is 0.075mm; the computing device is used to fit the linear relationship between the change in the mass of fine aggregate and the change in the total mass of the mixture, and based on the linear relationship, respectively calculate the mass of the dry fine aggregate before and after cleaning, and calculate the mud content of the fine aggregate The measuring tools used in this scheme not only improve the accuracy of measuring the mud content of fine aggregate, but also enhance the convenience and effectiveness of the experiment.

[0019] The rapid measurement method and measurement tool for fine aggregate mud content provided by the present invention can at least achieve the following beneficial effects: The test time is greatly shortened, and the purpose of inspecting fine aggregate at any time when it arrives on site is achieved. It is simpler and more convenient than the methods and test tools in the current standards, and is conducive to on-site operation. It not only improves the measurement accuracy of fine aggregate mud content, but also improves the convenience and effectiveness of the test.

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 A linear relationship curve diagram showing the change in mass of fine aggregate and the change in total mass of the mixture according to one embodiment of the present invention; Figure 2 A schematic flow chart of a method 200 for quickly measuring the mud content of fine aggregate according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0022] In cement concrete mixing plants, the mud content of fine aggregate is directly related to the strength, durability and overall performance of concrete, so accurate and timely detection of mud content is particularly important. In order to provide reliable mud content data in a shorter time, this scheme proposes a rapid measurement method for fine aggregate mud content. By changing the mass of fine aggregate, the linear relationship between it and the total mass of the mixture is explored, and the mass of dry fine aggregate samples before and after cleaning is calculated based on the linear relationship, so as to quickly calculate the fine aggregate mud content.

[0023] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0024] When the densities of the two substances are known and the volume of the mixture remains unchanged, two equations can be established based on the volume of the mixture and the density of each component to calculate the total mass of the mixture. For example, if the density of water is P1, the density of fine aggregate is P2, the mass of fine aggregate is m2, and the total volume of the two substances is V, the total mass M can be calculated using the following two linear equations: m1 / P1+m2 / P2=V M=m1+m2 By ensuring that the total volume remains unchanged, changing the mass of one substance, and calculating the total mass of the mixture, we can fit the linear relationship between the change in the mass of the substance and the change in the total mass of the mixture.

[0025] Specifically, select a volumetric flask, weigh the mass of the water when it is filled to the mark on the volumetric flask, calculate the volume of the water based on the mass and relative density of the water, and the volume of the water at this time is the total volume of the mixture. The volumetric flask and the test bottle used for subsequent measurements are the same container.

[0026] Set three masses of dry fine aggregate samples, and calculate the volumes of the three samples based on the mass and apparent density of the dry fine aggregate samples. Calculate the volume and mass of water in the mixture based on the total volume of the mixture and the volume of the three samples. Sum the calculated mass of water and the mass of the three samples to calculate the total mass of the mixture of the three samples and water.

[0027] With the total mass of the mixture as the x-axis and the mass of the dry fine aggregate sample as the y-axis, the linear relationship between the mass of the mixture and the mass of the dry fine aggregate is obtained: y=ax+b, where y is the mass of the dry fine aggregate sample, x is the total mass of the mixture, a is the slope, and b is the intercept.

[0028] In one embodiment of the present invention, the linear relationship equation between the mass of the fine aggregate dry sample and the total mass of the mixture can be fitted according to the following steps: 1) According to the method specified in the aggregate test procedure, measure the apparent density P of the sample to be tested. s According to the water temperature, the relative density of water P is obtained by looking up the table in the specification. W .

[0029] 2) Select a volumetric flask, weigh the bottle and record the weight, then return the reading to zero, add water to the flask to the mark, and weigh the mass of the water after subtracting the mass of the bottle (m w ), accurate to 0.01g, and calculate the volume of water using the following formula, which is the total volume of the mixture (V 总 ): V 总 =m w / P W , where m w is the mass of water, P W is the relative density of the test water; 3) Prepare three different masses of dry fine aggregate samples, with 400 g as the base mass and 20 g as the decreasing mass, and the masses are m s1 =400g, m s2 =380g and m s3 =360g, for each mass of the sample, calculate the volume of the sample using the following formula: V s =m s / P s , where V s is the sample volume, m s is the sample mass, P s is the apparent density of the sample. The volumes of the three samples are V s1 、V s2 、V s3 .

[0030] 4) Calculate the volume of water in the mixture (V w ) and the mass of water (m w ): For each sample, calculate the volume of water in the mixture: V w =V 总 -V s , the volume of water is V w1 、V w2 、V w3 .

[0031] Then, use the relative density of water to calculate the mass of water: m w =Vw *P W , the mass of water is m w1 、m w2 、m w3 .

[0032] 5) For each sample, calculate the total mass m of the mixture (water and sample) 总 : m 总 =m s +m w , and the three masses are m 总1 = m s1 +m w1 , m 总2 = m s2 +m w2 , m 总3 = m s3 +m w3 .

[0033] 6) The total mass of the mixture (water and sample) is m 总 is the x-axis, the mass of fine aggregate dry sample m s As the y-axis, draw a linear relationship curve between the change in fine aggregate mass and the change in the total mass of the mixture, and obtain the linear formula: y=ax+b, y is the mass of the dry sample, x is the total mass of water and sample, a is the slope of this fine aggregate, and b is the intercept of this fine aggregate.

[0034] Figure 1 FIG. 4 shows a linear relationship curve between the change in mass of fine aggregate and the change in total mass of the mixture according to an embodiment of the present invention. Figure 1 As shown, the total mass of the mixture (water and sample) is m 总 is the x-axis, the mass of the fine aggregate dry sample is the y-axis, y=ax+b, y is the mass of the dry sample, x is the total mass of water and sample, a is the slope of this fine aggregate, and b is the intercept of this fine aggregate.

[0035] Before the test, prepare an electronic balance with a weighing capacity of not less than 2000g and a sensitivity (accuracy) of at least 0.05g. Make sure the electronic balance has been calibrated before starting the test, and keep the balance on a stable, vibration-free tabletop to avoid direct sunlight and strong wind. The volume of the test bottle or volumetric flask is 1000mL and is set with scale lines. Make sure the test bottle is clean and free of residue. To ensure accurate data, the mud content test bottle used is the same container as the volumetric flask used when calculating the linear relationship curve. The sieve is composed of multiple sieves with different apertures stacked together, which is used to separate and screen granular materials. The minimum sieve hole diameter is 0.075mm. By pouring the material into the top sieve, larger particles will remain on it, while smaller particles will pass through the sieve and be screened layer by layer.

[0036] The computing device is used to fit the linear relationship between the change in mass of fine aggregate and the change in the total mass of the mixture, and based on the linear relationship, the mass of dry fine aggregate before and after cleaning is calculated, and the mud content of the fine aggregate is calculated.

[0037] Figure 2 FIG. 2 is a schematic flow chart of a method 200 for quickly measuring the mud content of fine aggregate according to an embodiment of the present invention. Figure 2 As shown, in step S210, for the fine aggregate containing water on site, a first mass of wet fine aggregate sample can be weighed, for example, 400 g ± 0.05 g of wet fine aggregate can be accurately weighed.

[0038] Then in step S220, a first mass of wet fine aggregate and a second mass of water are added to the test bottle so that the mixture of water and fine aggregate reaches the mark line position of the test bottle, and the total mass of the mixture is weighed.

[0039] For example, weigh and zero the test bottle, add about one-third of water to the test bottle, and then add all the wet fine aggregate sample weighed into the bottle. If the aggregate is too wet, rinse it with a small amount of water to help transfer all the sample into the bottle, but the water used for rinsing should not exceed one-third of the volume of the test bottle to avoid affecting the final measurement results.

[0040] Gently shake or rotate the test bottle to remove air and continue to add water to the mark on the test bottle. Then weigh the total mass of the water and fine aggregate sample in the test bottle (called x1) with an accuracy of 0.01 grams. Control the change in water temperature before and after the test within ±2°C to prevent temperature from affecting density and readings.

[0041] Next, in step S230, the mass of the dry fine aggregate before cleaning is calculated based on the total mass of the mixture and the linear relationship between the change in the mass of the fine aggregate and the change in the total mass of the mixture.

[0042] The dry fine aggregate mass y1 before cleaning was calculated by fitting the linear relationship between the change in fine aggregate mass and the change in the total mass of the mixture obtained before the test (the slope and intercept of the linear relationship) and the total mass of the mixture before cleaning x1: y1=ax1+ b.

[0043] In step S240, the mixture is filtered and washed multiple times, and the total mass of the washed mixture is weighed.

[0044] By shaking and rotating the mixture in the volumetric flask or stirring bottle, fine sand, mud and clay are separated from the sand particles and suspended in water to form a turbid liquid. Then the turbid liquid is poured into a sieve with a minimum mesh diameter of 0.075 mm for filtration to remove particles smaller than 0.075 mm. During the entire test process, both sides of the sieve can be wetted to avoid sand loss.

[0045] Repeat the above cleaning (adding water to separate, filtering) steps until the mixture is clean, re-clean the sand in the sieve and add it to the test bottle, adjust the water level in the test bottle to the marked line, and weigh the total mass of the cleaned mixture (called x2).

[0046] Furthermore, in step S250, the mass of the cleaned dry fine aggregate is calculated based on the total mass of the cleaned mixture and the linear relationship between the change in the mass of the fine aggregate and the change in the total mass of the mixture.

[0047] That is, calculate the mass of dry fine aggregate y2 after washing: y2= ax2+ b.

[0048] Finally, in step S260, the mud content is calculated based on the mass of dry fine aggregate before cleaning and the mass of dry fine aggregate after cleaning.

[0049] Using formula S n = (y1- y2) / y1× 100% Calculate the mud content, where y1 is the mass of the dry sample before washing and y2 is the mass of the dry sample after washing.

[0050] This scheme ensures the test error requirements specified in the current standards, while greatly shortening the test time, reducing the rapid test time of mud content in the current standards from 24 hours to 15 to 30 minutes, achieving the purpose of inspecting fine aggregate at any time upon arrival. It has very good application value, improves the detection time efficiency by more than 95%, and is simpler and more convenient than the methods and test tools in the current standards, which is conducive to on-site operations.

[0051] In summary, the present invention can at least achieve the following technical effects: The test time is greatly shortened, and the purpose of testing fine aggregate at any time is achieved. It is simpler and more convenient than the methods and test tools in the current standards, and is conducive to on-site operation. It not only improves the measurement accuracy of fine aggregate mud content, but also improves the convenience and effectiveness of the test.

[0052] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0053] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the following intention: that the claimed invention requires more features than the features explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0054] Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in the devices described in the embodiment, or alternatively may be located in one or more devices different from the devices in the examples. The modules in the foregoing examples may be combined into one module or may be divided into multiple submodules.

[0055] Although the present invention has been described according to a limited number of embodiments, it will be apparent to those skilled in the art, with the benefit of the above description, that other embodiments may be envisioned within the scope of the invention thus described. In addition, it should be noted that the language used in this specification is selected primarily for readability and teaching purposes, rather than for explaining or defining the subject matter of the present invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is illustrative and not restrictive with respect to the scope of the present invention, and the scope of the present invention is defined by the appended claims.

Claims

1. A method for quickly measuring the mud content of fine aggregate, characterized in that: include: Weigh the first mass of wet fine aggregate sample; Add the first mass of wet fine aggregate sample and the second mass of water into the test bottle, so that the mixture of water and fine aggregate reaches the mark line position of the test bottle, and weigh the total mass of the mixture before cleaning; The mass of the dry fine aggregate before cleaning is calculated based on the total mass of the mixture before cleaning and the linear relationship between the change in the mass of the fine aggregate and the change in the total mass of the mixture; Filtering and washing the mixture multiple times, and weighing the total mass of the washed mixture; The mass of the cleaned dry fine aggregate is calculated based on the total mass of the cleaned mixture and the linear relationship between the change in the mass of the fine aggregate and the change in the total mass of the mixture; The mud content is calculated based on the mass of the dry fine aggregate before cleaning and the mass of the dry fine aggregate after cleaning.

2. The rapid measurement method of fine aggregate mud content according to claim 1 is characterized in that: The step of adding the first mass of wet fine aggregate sample and the second mass of water into a test bottle so that the mixture of water and fine aggregate reaches the mark line position of the test bottle, and weighing the total mass of the mixture before cleaning comprises: Add water with a volume of 1 / 3 of the volume of the bottle into the test bottle, and then add the first mass of wet fine aggregate sample; Rotate or shake the test bottle and continue to add water to the mark on the test bottle, and weigh the total mass of the water and fine aggregate mixture.

3. The rapid measurement method of fine aggregate mud content according to claim 2 is characterized in that: The temperature change of the water before and after the test does not exceed 2°C.

4. The method for rapid measurement of fine aggregate mud content according to claim 1, characterized in that: The step of calculating the mass of the fine aggregate before cleaning based on the total mass of the mixture before cleaning and the linear relationship between the change in the mass of the fine aggregate and the change in the total mass of the mixture comprises: The linear relationship between the change in mass of fine aggregate and the change in total mass of the mixture was obtained by fitting before the test; The mass of dry fine aggregate before cleaning is calculated based on the total mass of the mixture before cleaning and the intercept and slope of the linear relationship.

5. The method for rapid measurement of fine aggregate mud content according to claim 4, characterized in that: The step of fitting the linear relationship between the change in mass of fine aggregate and the change in total mass of the mixture before the test comprises: When the water is filled to the mark on the volumetric flask, the mass of the water is weighed, and the volume of the water is calculated based on the mass and relative density of the water. The volume of the water at this time is the total volume of the mixture, and the volumetric flask and the test bottle are the same container; Three masses of dry fine aggregate samples are set, and the volumes of the three samples are calculated based on the mass and apparent density of the dry fine aggregate samples; Based on the total volume of the mixture and the volumes of the three test samples, the volume and mass of water in the mixture are calculated respectively; Sum the calculated mass of water and the mass of the three samples respectively to calculate the total mass of the mixture of the three samples and water; With the total mass of the mixture as the x-axis and the mass of the dry fine aggregate sample as the y-axis, the linear relationship between the mass of the mixture and the mass of the dry fine aggregate is obtained: y=ax+b, where y is the mass of the dry fine aggregate sample, x is the total mass of the mixture, a is the slope, and b is the intercept.

6. The method for rapid measurement of fine aggregate mud content according to claim 5, characterized in that: Taking the first mass as the reference mass, the mass is gradually reduced by 20 g to obtain three masses of dry fine aggregate samples.

7. The method for rapid measurement of fine aggregate mud content according to claim 4, characterized in that: The step of filtering and washing the mixture multiple times and weighing the total mass of the washed mixture comprises: Shake or rotate the mixture in the volumetric flask or stirring bottle to separate the dust, silt, clay and sand in the fine aggregate and suspend them in the water to form a turbid liquid; The turbid liquid is poured into a sieve with a minimum mesh diameter of 0.075 mm for filtration; Repeat the steps of adding water, separating and filtering until the mixture is clean, re-wash the sand in the sieve and add it into the test bottle, adjust the amount of water in the test bottle to the position of the mark line, and weigh the total mass of the washed mixture.

8. The method for rapid measurement of fine aggregate mud content according to claim 5, characterized in that: The mass of the dry fine aggregate before cleaning is y1: y1 = ax1 + b, and the mass of the dry fine aggregate after cleaning is y2: y2 = ax2 + b, wherein a and b are the slope and intercept of the linear relationship, respectively, x1 is the total mass of the mixture before cleaning, and x2 is the total mass of the mixture after cleaning.

9. The method for rapid measurement of fine aggregate mud content according to claim 8, characterized in that: The mud content is calculated using the formula S n = (y1- y2) / y1 × 100% calculation, where y1 is the mass of dry fine aggregate before washing and y2 is the mass of dry fine aggregate after washing.

10. A measuring tool for fine aggregate mud content, characterized in that: include: An electronic balance, a volumetric flask, a set of sieves and a computing device; the weighing capacity of the electronic balance is not less than 2000g, and the accuracy is at least 0.05g; the volumetric flask has a capacity of 1000mL and is provided with scale lines; the set of sieves includes a plurality of sieves with different apertures, and the minimum sieve aperture diameter is 0.075mm; the computing device is used to fit the linear relationship between the change in the mass of fine aggregate and the change in the total mass of the mixture, and based on the linear relationship, respectively calculate the mass of dry fine aggregate before and after cleaning, and calculate the mud content of the fine aggregate.

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