wholesale jewelry suppliers hiring distributors Is the sand and sandwood below the paddling channel better or coarse sand

anna wholesale jewelry and accessoried coarse sand.
The thick sand is suitable for large -volume concrete. Zhongsha is used in ash or bricks, and fine sand is used for sliding seams. As long as there is no mud, the sand used in good sand concrete should be used in Zhongsha. The sand can be divided into one, two, and three -level distribution areas by the size of the particle size, which is usually referred to as fine sand, medium sand, and coarse sand.