Sand and gravel aggregate is the granular loose material that plays the role of skeleton or filling in the concrete. Application of aggregates in Civil Engineering: cement concrete, asphalt concrete, road foundation, railway ballast, mortar, etc. The annual consumption is about 2billion tons.
How many types of aggregates can be divided?
1.According to the source of aggregate.
Natural rock aggregate: aggregate composed of natural rock, such as sand, pebble, gravel, etc;
Artificial aggregate: thermal processed aggregate includes expanded shale, expanded vermiculite, etc; Industrial by-products include slag, iron slag, powder slag, etc;
Recycled aggregate: broken concrete, broken clay brick, etc.
2.According to the particle size of aggregate.
Coarse aggregate: rock particles with particle size larger than 4.75mm, such as pebbles and crushed stones;
Fine aggregate: rock particles with particle size less than 4.75mm, such as river sand, mountain sand, sea sand, etc.
3. According to the density of aggregate, it is divided into.
Ordinary aggregate: the density is 2500-2700kg/m ³;
Lightweight aggregate: density 0~1000kg/m ³, Such as ceramsite, calcined shale, expanded vermiculite, expanded perlite, foamed plastic particles, etc;
Heavy aggregate: density 3500-4000kg/m ³,Such as iron ore, barite, etc.
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