Shanghai sales construction aggregate colored sand.

Divided into three categories according to technical requirements:    Ⅰ, Ⅱ, Ⅲ.
 Ⅰ: for> C60 concrete

 Ⅱ: for the C30-C60 concrete

 Ⅲ: for <C30 concrete and building mortar
 Aggregate contains preventing hydration and cement corrosion, reduce the adhesion of cement and aggregates a variety of substances.
 Category: mica, clay, silt and organic matter and so on.
 Hazard: prevent the cement and aggregate bond, impact strength of concrete; increased water consumption, increased contraction; cause cement corrosion.
 Treatment: When the sand content and harmful impurities, but it must be used, to be washed with water, if it meet the requirment after washing, you can use.