The Brief Introduction of Coarse Aggregate And Fine Aggregate

The aggregate, whose particle size is greater than 4.75mm after crusher processing (jaw breaker) is known as coarse aggregate, commonly called stones. Macadam and pebble are the frequently used ones. The gravel is made of natural rock or rock by crushing and screening, a kind of rock particles whose diameter is greater than 4.75mm. Pebbles are produced by natural weathering and water handling, a kind of rock particles whose diameter is greater than 4.75mm. The pebbles and gravel particles, whose length is 2.4 times greater than the average particle diameter belong to the needle-shaped particles; whose thickness is 0.4 times less than the average particle diameter belong to tabular grains (average particle diameter refers to the average particle diameter fractions of the upper and the lower limit). Construction pebbles and gravel should meet the technical requirements of national standards GB / T 14685-2001. The choice of materials is wide and the finished products of the general ore can meet the needs after being processed by the corresponding processing equipment (rock crusher), supplying the materials for construction.
After the primary crushing and the crushing and shaping of sand making machine, the aggregate, whose particle size is less than 4.75mm, known as fine aggregate, commonly named sand. According to the production source, the sand is divided into two categories: natural sand and artificial sand. Natural sand is made by natural weathering, water handling, sorting and stacking, whose particle size is less than 4.75mm. The sand does not include the particles of soft rock and decayed rock. Natural sand includes river sand, lake sand and mountain sand and desalinated sea sand and the artificial sand the joint name of manufactured sand and mixed sand.
As for the aggregate investment, the demand side and the projects that will use the finished aggregate is the first problem. Aggregate is primarily used to provide granulous loose material to form the skeleton and fill for the concrete and building aggregate. It is divided into coarse aggregate and fine aggregate. Coarse aggregate includes pebbles, gravel and slag and fine aggregate includes the fine sand and coal ash.

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