iver sand is rock particles naturally formed by natural stones under the action of water, undergoing repeated collision and friction over a long period of time. It is also formed by siliceous rocks through weathering, abrasion, mechanical impact, and other natural processes over hundreds of millions of years, featuring a natural continuous gradation. In contrast, manufactured sand is produced by mechanical crushing and has a naturally discontinuous gradation. Sand-making processes are divided into dry method and wet method:
The dry sand-making process is not restricted by water resources and can be carried out even in water-scarce areas. However, dry sand-making often generates a large amount of fine powder and soil, which affects the workability of concrete. The gradation of manufactured sand produced by this method usually presents a dumbbell-shaped distribution, requiring gradation optimization through screening.
Wet sand-making removes soil through water washing, producing relatively clean sand and gravel particles. Nevertheless, it tends to wash away some fine particles, resulting in poor gradation. In addition, wet sand-making requires a large amount of water resources. When recycling water, flocculants need to be added, and these flocculants may remain in the sand and gravel, affecting the performance of concrete. Shibang Group holds the view that both dry and wet sand-making methods have their own advantages and disadvantages. Enterprises should select the appropriate process according to specific circumstances, and improve the quality and performance of manufactured sand through equipment optimization and process improvement.
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