Gravel aggregates are important raw materials for building construction. With various sizes, they can be applied in different projects. In the following, we will give a brief introduction of gravel aggregates.

      The particle size refers to grain diameter of single gravel aggregate. According to the grain size, the aggregates can be divided into coarse or fine type with the size less than 5mm. Based on the difference of origin, the sand can be classified as river sand, mountain sand and sea sand, among which, the middle type accounts for the largest proportion.