There are several types of stone sizes There are several specifications of stone sizes

3 types.

The more commonly used are pebbles, gravel, and pebbles.

The diameter of pebble particles should be greater than 100 mm of rock particles, which is made of natural weathering, flowing water transportation and accumulation, and the diameter of gravel particles should also be greater than 100 mm of rock particles, which is made of rocks, pebbles or mine gravel through mechanical manufacturing and screening, and the diameter of pebbles particles should be greater than 10 cm.

Precautions for the use of sand and gravel.

The factory quality certificate and test report of sand and gravel should be consistent with the physical evidence between the physical objects. The factory quality certificate must be stamped by the manufacturer's quality inspection department, and the test report must be signed by the relevant personnel of the testing unit and stamped by the unit.

The user must carefully check whether the measured values in the factory quality certificate and test report are in line with the standards specified in the specification. The test number should be included in the test report to facilitate verification and verification of the relevant information of the laboratory. There should be a clear conclusion in the test report, and the signature and seal should be complete.

Construction stones (stones) are divided into pebbles, gravel, and pebbles.

Pebbles: Rock particles larger than the particle size formed by natural weathering, water transport, sorting, and accumulation.

Crushed stone: natural rock, pebbles or mine waste rock made by mechanical crushing and screening, and the particle size is larger than the rock particles. ·

Natural pebbles 10cm can be used for building filling, paving, cobblestone wall decoration, etc.

For detailed specifications of stones, please refer to the relevant standards of GB T14685 for pebbles and gravel for construction.

Concrete requires cement, sand, stones, etc., and the stones in this case are crushed stones.

There are several types of crushed stone specifications:

1. According to different uses, there are many specifications and models of gravel. If used in construction or paving roads, gravel specifications are common in these types, usually used 05 stones, referring to the particle size control between 0-5mm.

2. If the stone is 12, the particle size is between 10-20mm, which belongs to the single grade of gravel. 13 stones, its particle size represents 16-30mm, 24 stones particle size is between 10-15mm.

3. In addition, there are 46 and other specifications, and the use is also different, which can be used for the configuration of building aggregates, and can also be used in various fields such as pouring steel bars or laying railways.

Particle size control of finished stone products:

1. It can be directly through the crusher to break large stones into stones, which is a commonly used equipment, and it has different types and specifications, different types, and the size of the material is also different.

2. Preliminary control is carried out according to the discharging strength of the crusher, for example, there is a kind of impact crusher or hammer crusher, and the control mode is also different. There is a late one is a counterattack to break the friend Li crusher, it belongs to the neutral crusher, the finished product strength is very good, adjust the speed. If the gap between them increases, the particle size will also increase.

3. There are certain standards for stones or sand, such as gravel is divided into 5-10mm or 10-20mm. <

The size of 15 stones is 20 cm. Stone generally refers to the small rock mass that falls off by the external force of the large rock mass, mostly attached to the surface of the large rock mass, generally into a block or oval, the appearance is rough, some are smooth, the texture is firm, brittle and hard. It can be used to make stone tools and collect stone mines.

Thousands of years ago, our ancestors used stones to make fires. Stones are generally composed of calcium carbonate and silicon dioxide.

Stone particle size standard.

Stone powder particle size: rock particles with particle size less than mm, coarse sand particle size: 2 medium sand particle size: ; Fine sand particle size: Stone particle size: 5-40mm Sheet stone particle size: more than 80mm.

The classification of stones is divided according to the size of the particle size, we usually use inches to say that 1 3 points is a specification line, 4 9 points a specification line, and the manufacturer is divided into "of." It can also be divided into pebbles and gravel, and then there are stone chips that are also very fine small stone pieces; Stone and flake stones belong to stone, and stone chips and stone powder are formed by stone crushing.

There are three types of construction stones, as follows.

1. It should be used for concrete with a strength grade greater than C60;

2. It is suitable for concrete with strength grade C30 C60 and frost resistance, impermeability or other requirements;

3. The class should be used for concrete with a strength grade less than C30.

Construction stones are divided into pebbles, pebbles, and gravel. Pebbles and gravel are divided into classes, classes and classes according to technical requirements. Specifications:

According to the size of pebbles and gravel, it is divided into single grain grade and continuous grain size. It can also be mixed into pebbles and gravel of special grain sizes according to the needs of different single grain grades.

Pebbles or gravel are required to be classified by millimeter, millimeter, millimeter, millimeter, millimeter, millimeter, milli

The cumulative sieve allowance of each sieve reaches the specified particle gradation of a certain continuous particle size. It is also possible to screen out pebbles and gravel required for the gradation of single grain fractions. Pebbles and crushed stones of a single grain size are generally used to combine them into a continuous grain fraction with the required gradation; It can also be mixed with continuous fractions of pebbles or gravel to improve their gradation or to create continuous fractions with larger particle sizes.