Release time: 17:24, October 31, 2020 Publisher: Dongmeng Road & Bridge Machinery Co., Ltd.
How to express the particle size of stone and sand used in construction? To understand the terms of the lower sandstone circle
In sand and stone processing, we often hear customers mention 1-2, 1-3 stones, 3.0 sand, etc., so what size does it represent? Today, let's learn how to express the grain size of stone and sand for construction.
The size of stones is not uniform. After being crushed in the production line, different ranges need to be screened and graded by vibrating screen. The range of 1-2, 1-3 and 2-4 refers to this range, and the unit is cm, that is, cm.
The stone grain size is usually between 5mm and 31.5mm, and the specific classification is as follows
5-1 stone represents 5-10 mm gravel;
1-2 stones represent 10-20 mm gravel;
1-3 stones represent 16-31.5mm gravel;
2-4 stones represent two or four points, and the international standard is 1 / 4-1 / 2 inch, representing 10-15mm gravel;
4-6 stones represent four or six points, and the international standard is 1 / 2-3 / 4 inch, which means 15-20 mm gravel.
Let's take a look at the grain shape standard of sand (machine-made sand).
Refer to the standard of construction sand in China: sand refers to the rock debris with particle size less than 5mm formed and accumulated in natural conditions such as lake, sea, river and mountain. It can also be the construction particle with particle size less than 4.75mm which is processed by mining machinery. According to the fineness modulus, the sand can be divided into four grades
Coarse sand: fineness modulus is 3.7-3.1, average particle size is more than 0.5mm.
Medium sand: fineness modulus is 3.0-2.3, average particle size is 0.5-0.35mm.
Fine sand: fineness modulus is 2.2-1.6, average particle size is 0.35-0.25mm.
Ultra fine sand: fineness modulus is 1.5-0.7, average particle size is less than 0.25 mm.
In addition to the grain size and size specifications, the construction projects also have corresponding requirements for the needle and flake particles, mud content, mud block content, stone powder content and firmness of sand and stone materials. Therefore, the requirements should be specified in advance when the production line is configured, so as to avoid affecting the quality and sales of finished materials.
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