Natural gravel or sand are usually dredged or
Fine aggregate refers to the gravel or crushed stone material whose stone size is less than 5MM used for preparing the concrete. Fine aggregate is also divided into coarse sand, medium sand, fine sand and finer sand, whose fineness modulus is of 3.7 ~ 3.1, 3.0 ~ 2.3, 2.2 ~ 1. 6 and 1.5 ~ 0.7. According to production sources and materials, fine aggregate can be divided into ordinary river sand, mountain sand, sea sand, artificial crushed sand (stone chips), and waste sand.
Concrete fine aggregates generally uses clean river sand, suitable for the medium and coarse sand. Coarse aggregate should appropriately use gravel, crushed stone or crushed gravel based on local resources and material supplying conditions, combined with engineering and technical requirements. The maximum size of coarse aggregate should be decided according to the structure, steel spacing and construction methods, equipment and other selected conditions.
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