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河砂是短时期内不可再生的天然资源,市场供不应求,且砂子偏细。机制砂(Manufactured sand)是经除土处理,由机械破碎、筛分制成的,粒径小于4.75mm的岩石、矿山尾矿或工业废渣颗粒,但不包括软质、风化的颗粒,俗称人工砂。机制砂在生产过程中不可避免地产生一些粒径小于0.075mm的石粉颗粒,约占机制砂总量的10%~15%。
River sand is a non-renewable natural resources within a short period of time, the market in short supply, and the fine sand. Manufactured sand is manufactured by mechanical removal and sieving of demineralized, sized, less than 4.75mm rock, mine tailings or industrial waste particles, but excluding soft, weathered particles, commonly known as artificial sand. Mechanism sand in the production process will inevitably produce some particle size less than 0.075mm stone powder particles, accounting for about 10% to 15% of the total amount of sand.