How to detect the mud content in machine made sand and gravel powder

The stone powder in the machine-made sand is a particle size smaller than the particles, if the machine-made sand contains an appropriate amount of stone powder, it is beneficial for its use, but there are strict requirements for the content of the stone powder, and the general standard for the content of the stone powder is sand-like, sand-like, sand-like.

When it is used to pump concrete, it must contain a certain amount of stone powder to achieve good workability, and generally speaking, the stone powder content is suitable at 10% to 14%.

Precautions for raw materials of machine-made sand and gravel.

When the user is producing, he should also choose the sand making machine according to the size of the sand making production line. Generally speaking, when sand making machines and other large crushers are reinstalled, most of them are installed on cement-based piles.

On the premise of considering the control of the number of machine-made sand fineness molds, if the working site of the production line is not fixed, it is necessary to choose those equipment that can be moved during production, such as mobile sand making machine, which will be more convenient to use.

Machine-made sand inevitably produces a part of stone powder in the production process, and the stone powder content of raw sand is generally as high as 10%-20%.In this paper, the effects of different stone powder contents %) on the working performance, compressive strength, water pressure impermeability and chloride diffusion coefficient of C30 pumped concrete were studied. The test results show that the stone powder content in the machine-made sand can be relaxed from the limit of 7% to 10%-15% in the preparation of C30 pumped machine-made sand concrete

The national standard stipulates that when the MB value is less than 10%, the stone powder can be less than 10%! Because stone powder has an impact on the strength and workability of concrete, each company controls it according to its own situation, and some 15% can also be used! It is recommended to check on the Internet: such as the machine-made sand and gravel equipment network, concrete forum, etc.**.

Summary. There are two methods for the mud content test of sand: standard method and siphon method, which are described in detail below

1. Standard Law.

1. Sampling. 1) Sampling method: When sampling on the stockpile, the sampling parts should be evenly distributed. Before sampling, the surface layer of the sampling site was removed, and then 8 parts of sand with approximately the same amount were randomly selected from different parts to form a group of samples.

2) Number of samples: When determining the mud content, the minimum number of samples is kg.

3) Sample treatment: put the sample on the plate, mix evenly in a wet state, and pile into a round cake with a thickness of about 20 mm, and then divide the round cake into roughly equal parts along the two diameters perpendicular to each other, take two of the diagonal parts and mix them again, and then pile them into round cakes. Repeat the process until the sample is reduced to the amount required for the test.

2. Shrink the above sample to about 1100 g, dry it in a drying oven under (105 5) to a constant amount, and after cooling to room temperature, divide it into roughly equal parts for later use.

3. Weigh 500 g of the sample, accurate to g. Pour the sample into the washing container, inject clean water, make the water surface about 150 mm higher than the sample surface, mix well, soak for 2h, and then wash the sample in the water by hand to sink the chips.

How to test the mud content of sand.

Hello, it's a pleasure to serve you.

There are two methods for the mud content test of sand: standard method and siphon method, which are described in detail below: 1. Standard method 1, sampling (1) Sampling method: When sampling on the stockpile, the sampling parts should be evenly distributed.

Before sampling, the surface layer of the sampling site was removed, and then 8 parts of sand with approximately the same amount were randomly selected from different parts to form a group of samples. 2) Number of samples: When determining the mud content, the minimum number of samples is kg.

3) Trapped sample treatment: put the sample on the plate, mix evenly in the wet state, and Wang Yuxiang stacked into a round cake with a thickness of about 20 mm, and then divide the round cake into roughly equal parts along the two diameters perpendicular to each other, take two of the diagonal parts and mix well, and then pile them into round cakes. Repeat the process until the sample is reduced to the amount required for the test.

2. Shrink the above sample to about 1100 g, dry it in a drying oven under (105 5) to a constant amount, and after cooling to room temperature, divide it into roughly equal parts for later use. 3. Weigh 500 g of the sample, accurate to g. Pour the sample into the elution container, inject clean water, make the water surface about 150 mm higher than the sample surface, mix well, soak for 2h, and then wash the sample in the water quietly by hand to make the chips sink.

The stone powder content grade of manufactured sand is respectively %, which is relatively relaxed by 2% compared with the mud content of natural sand. In order to prevent the machine-made sand from being mixed with excessive amount of soil due to various factors in the mining and processing process, the machine-made sand used in the construction sand must pass the inspection of methylene blue MB value, and strict inspection and testing must be carried out at the factory (field) and construction site of the sand material.

The content of qualified machine-made sand and gravel powder that has passed the methylene blue MB value test is controlled and used according to %. For the inspection and testing results of methylene blue value, the stone powder content of unqualified machine-made sand is strictly controlled and used according to %, so as to avoid the adverse effects on concrete due to the high stone powder content of machine-made sand.

The influence of the powder content of manufactured sand on the MB value, can the MB value be reduced by reducing the powder content?

According to the "Highway Asphalt Pavement Design Code", the quality requirements of fine aggregate for asphalt mixture for high-speed high-speed roads and first-class highways: mud content is not more than 3%, and sand equivalent is not less than 60%. The cleanliness of fine aggregates, natural sand is expressed in terms of mud content, and machine-made sand is expressed in sand equivalent.

The requirement of stone powder content in machine-made sand is to determine the sand equivalent of machine-made sand, and there is no need to measure the mud content, which is also reflected in the "Highway Engineering Aggregate Test Regulations" (fine aggregate mud content test (screening method) is not suitable for fine aggregates with more mineral powder components such as artificial sand and stone chips). Therefore, in the actual mix ratio design of machine-made sand, the sand equivalent of high-speed first-class highway is required to be not less than 60%, and the methylene blue value is not more than 25.

Kiss, <>

I am glad to answer for you the mud content test method of sand: take some sand, generally weighing more than 500 grams of sand, put it in the oven, adjust the temperature to 105 degrees and dry it to a dry state. Remove and let cool.

Weigh 500 grams, pour into a container and start washing. Wash several times, and filter through an 80 micron sieve until the water is clear. The remaining sand is then placed in the oven to dry again.

After drying, subtract the weight of the dried sand from 500 grams and divide it by 500 grams, multiply by 100%, and the final result is the mud content of the sand. Extended information 1, grab a handful of sand with your hands, hold it hard, and then loosen it, if the sand is in the hands of the ball, it means that the mud content is too large, and the dirty hands must contain a large amount of clear potato puree. 2. Drop the clear water, grab a handful of sand, and drop the old and old water, the water is turbid, indicating that the mud content is large, and the color change of the water is not much, indicating that the mud content is small.

Hope mine can help you! <>

The detection method of sand mud content is as follows:

Measure the mud content of sand: dissolution method, weigh a certain amount of mud-containing sand (such as 100g), add water and stir to completely dissolve the soil, and then weigh the weight of the remaining sand to measure the mud content. Weighing method, weigh the weight of the same volume of soil, sand, and sediment containing mud as x, y, z, and set the mud content to n, then xn+y(1-n)=z, and find n.

Muddy content and mud content regulations:

Powdery materials such as clay, silt, and stone chips with a particle size smaller than are collectively referred to as mud. Lumpy clay and silt are collectively referred to as mud blocks or clay blocks (for fine aggregates, they refer to particles that are larger in size and become small after washing hands with water; For coarse aggregates, it refers to particles that are larger in size and become smaller after being washed and pinched with water).

The mud is often wrapped on the surface of the sand particles, so it will greatly reduce the interfacial adhesion between the sand and the cement stone, so that the strength of the concrete is reduced, and the specific surface area of the mud is large, and the fluidity of the concrete mixture will be reduced when the content is large, or the mixing water and cement consumption and the dry shrinkage and creep of the concrete will be increased, and the durability of the concrete will be reduced.

The effect of mud on the properties of concrete is basically the same as that of mud, but it is more harmful.

The mud content has a great influence on the performance of the molding sand, such as reducing air permeability, refractoriness, and improving the wet strength, so it is one of the quality indicators of the raw sand, so the mud content of the raw sand or old sand must be known in production.