Why is the siphon method suitable for determining the mud content of extra fine sand?

The siphon method is suitable for the determination of the mud content in the sand, especially for the determination of the mud content in extra-fine sand. By precipitating the siphon, no fine particles will flow out. The standard method is suitable for determining the mud content of coarse, medium and fine sand!

One. The drying temperature range for sand and stone is (105 5).

Two. The effects of the mud content of crushed stone on concrete are:

1. Workability: The sludge content of aggregates with high mud content will adsorb water and admixtures, affecting fluidity and cohesion. The semi-finished concrete is not good looking and not easy to use, and the slump loss will be faster than that of the lower mud content.

2. Strength: Because the mud of the aggregate will adsorb water and admixtures. Therefore, water and admixtures do not react with the cementitious material with the heat of hydration at maximum efficiency, which directly leads to a decrease in strength.

For example, if you use glue to stick two things, and there is more dust on them, then the effect of cohesion is not so good. This is an indirect reason for the low strength of concrete due to the high mud content of the aggregate. The higher the strength grade of concrete, the higher the mud content, and the more obvious the impact on strength.

3. The impact of molding: First of all, it is easy to crack, which is similar to the meaning of glue sticking to things just now. Secondly, the higher the mud content of the aggregate, the stronger the shrinkage of the concrete. The higher the mud content, the worse the concrete's carbonization resistance will be, which will affect the durability of the concrete.

4. Others, a small amount of mud in the aggregate, such as 1%, has no effect on the impermeability of concrete. However, if the mud content exceeds 10%, the impermeability is significantly reduced. If the mud content is 1%, the frost resistance is slightly reduced, and if it exceeds 5%, the frost resistance is significantly reduced.

3. To determine the mud content of sand, please refer to the "Standard for Quality and Inspection Methods of Sand and Stone for Ordinary Concrete" JGJ 52-2006: mud content test of sand (standard method), mud content test of sand (siphon method), mud content test of sand, mud content test of sand. The above is very detailed, among which the siphon method is a common method for detecting the mud content of sand in China, and the standard law is internationally applicable.

Fourth, the flake gravel first affects the pumpability of the concrete, and the needle flake rolling is not good, and it is not easy to flow with the concrete in the tube, which increases the pressure of the pump and aggravates the friction of the pump pipe, which affects the pumping performance. The second is strength, needles and flake gravel have a great impact on strength. Needle flake gravel has an impact on the crushing value index of the crushed stone itself, and the strength of the aggregate is not good, which directly affects the strength of the concrete.

Fifth, there is no rigid regulation on the grading of sand particles and the strength grade of concrete. If a class of sand is selected, the sand rate should be increased, and sufficient cement dosage should be maintained to meet the workability of concrete. Class I sand can be used for concrete of any strength grade.

In practice, a class of sand is suitable for cushions, floors, karst caves, non-impermeable felling floors and other construction parts.

Summary. A variety of methods can be used to determine the sludge content, among which the siphon method is a commonly used method. The siphon method is suitable for the determination of solutions or suspensions with a lower sludge content.

The basic principle is that a long tube (siphon) is used to quickly aspirate the sample in the vertical direction, and the particulate matter (such as sediment) in the sample is adsorbed on the inner wall of the siphon as the siphon rises to form a highly measurable column. The advantages of the siphon method are that it is simple to operate, does not require special instruments and equipment, and at the same time the measurement results are highly accurate. In addition, the siphon method is also suitable for samples containing a large amount of precipitate, which can be removed from the sample to improve the accuracy of the test.

It should be noted that the accuracy of the siphon method for determining the mud content is affected by a variety of factors, such as the viscosity of the sample, the surface tension and the density of suspended particles. Therefore, when performing the siphon method to determine the mud content, it is necessary to repeat the measurements of each sample several times, and the average value is taken as the final result.

Fellow, I really didn't understand, I can be more specific.

A variety of methods can be used to determine the sludge content, among which the siphon method is a commonly used method. The siphon method is suitable for the determination of solutions or suspensions with a lower sludge content. The basic principle is to quickly aspirate the sample in the vertical direction through a long tube (siphon), and the particulate matter (such as sediment) in the sample is adsorbed on the inner wall of the siphon as the siphon rises to form a highly measurable column.

The advantages of the siphon method are that it is simple to operate, does not require special instruments and equipment, and at the same time the measurement results are highly accurate. In addition, the siphon method is also suitable for samples containing a large amount of precipitate, which can be removed from the sample to improve the accuracy of the test. It should be noted that the accuracy of the siphon method for determining the mud content is affected by many factors, such as the nuclear viscosity of the sample, the surface tension and the density of suspended particles.

Therefore, when the siphon method is used to determine the mud content, it is necessary to perform multiple repeated measurements for each sample, and the average value is taken as the final result.