What do you know about the type of sand aggregate?

　　Gravel aggregate is a granular loose material that ACTS as a skeleton or filling in concrete. Application of aggregate in civil engineering: cement concrete, asphalt concrete, road foundation, railway track slag, mortar, etc. Use about 2 billion tons a year.

　　How many types of aggregate are there?

　　(1) it can be divided into:

　　Natural rock aggregate: aggregate composed of natural rocks, such as sand, pebbles, gravel, etc.;

　　Artificial aggregate: hot processed aggregate include expanded shale, expanded vermiculite, etc. The by-products of industry include slag, iron slag, powder slag, etc.

　　Recycled aggregate: broken concrete, broken clay bricks, etc.

　　(2) it is divided into:

　　Coarse aggregate: rock particles with a diameter greater than 4.75mm, such as pebbles, gravel, etc.;

　　Fine aggregate: rock particles with a diameter less than 4.75mm, such as river sand, mountain sand, sea sand, etc.

　　(3) it is divided into:

　　Ordinary aggregate: the density is 2500-2700kg /m cubed;

　　Light aggregate: the density is 0~1000kg/m cubed, such as ceramic granule, calcined shale, expanded vermiculite, expanded perlite, foam plastic granule, etc.

　　Heavy aggregate: the density is 3500-4000kg /m cubed, such as iron ore, barite, etc.

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