Specific application of different machine-made sand grading methods

The grading of machine-made sand refers to the proportion of sand particles of different sizes. Different machine-made sand grading methods have different application scenarios and advantages. Let's take a look at several common machine-made sand grading methods and their specific applications.

Application of different grading methods

Single grading

Single grading refers to the use of sand of a single particle size to prepare concrete. This grading method has the advantage of being simple and easy to implement, but it is easy to cause the gaps between the sand to be too large, affecting the density and strength of the concrete. Therefore, single grading is suitable for projects that do not require high concrete strength.

Double grading

Double grading refers to the use of two different particle sizes of sand to prepare concrete. This grading method can increase the density of concrete, improve its strength and durability. Therefore, double grading can meet the requirements of different projects for concrete performance and is a more commonly used grading method.

Three-gradation

Three-gradation refers to the use of three different particle sizes of sand to prepare concrete. This grading method can further increase the density of concrete and improve its strength and durability. Therefore, three-gradation is widely used in some high-strength and high-durability projects.

Mixed gradation

Mixed gradation refers to the mixing of natural sand and gravel of different particle sizes and artificially graded machine-made sand. The mixed-graded machine-made sand has better permeability and bearing capacity, and can also improve the strength and stability of the structure. Therefore, this method is widely used in some special projects, such as hydraulic structures, airport runways and other projects with extremely high strength and stability requirements.

Take double-gradation and three-gradation as examples. Although both can significantly improve the strength and durability of concrete, they will also increase the brittleness of concrete to a certain extent. Therefore, in the specific machine-made sand production process, it is necessary to select appropriate production processes and grading methods according to the specific construction project requirements and concrete performance requirements to achieve the best engineering effect. At the same time, it is also necessary to strengthen the quality control and management of the machine-made sand production process to ensure that its quality and stability meet the construction requirements.

Reasonable grading standard recommendations

Commonly used machine-made sand grading standards include: Chinese standard, European standard, American standard and Japanese standard, etc. In order to meet the requirements of machine-made sand in different fields, different grading standards are recommended. For example, machine-made sand in the fields of construction, bridges, roads, etc. can adopt European standards or American standards; for high-quality machine-made sand required for the manufacture of high-quality concrete, which has special needs, the more stringent particle size distribution requirements of European standards can be adopted; for some low-quality construction fields, Chinese standard can be adopted to meet basic waterproofing and anti-seepage requirements.

In addition, in the preparation of high-strength concrete, the amount of machine-made sand should be controlled within an appropriate range. Generally speaking, the amount of machine-made sand should be controlled between 20%-30% of the total mix. If the amount is too much, the strength of the concrete will be lower than the design requirements, and if the amount is too little, the working performance of the concrete will be poor, easy to crack and easy to deform.

About machine-made sand equipment

Xin Gaonai Heavy Industry has been engaged in the mining crushing industry for many years. It not only has VSI series vertical shaft sand making machine, roller sand making machine, single rotor reversible sand making machine, double rotor sand making machine, cone crusher and other types of fixed machine-made sand production line equipment, but also new mobile sand making machine, which integrates feeding, crushing, screening and transportation. It can be produced on site and is convenient for changing production sites. The finished sand produced by them has reasonable grading and rounded particles, which can meet the standards of fine sand. As for how to choose, you can make a comprehensive consideration based on your actual production situation, site, funds and other aspects, or you can contact us, and we will arrange technical personnel to connect with you and give you professional reference suggestions.

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