Requirements for Raw Materials in Manufactured Sand Production

Raw materials are a critical factor directly impacting the quality of sand and gravel products. The inherent properties and structure of the raw materials, along with factors that cause them to exhibit different characteristics under varying environmental conditions, can potentially lead to quality incidents if handled carelessly. Therefore, raw materials must be treated with utmost care and rigor to ensure the quality of the final product.

Not all materials are suitable for manufactured sand production. Specific requirements exist for raw materials, such as:

1. Raw materials used for manufactured sand production should have a compressive strength no lower than 80 MPa. Materials should not exhibit potential alkali-aggregate reaction activity. Clean, hard raw materials free of weak particles are preferable.

2. When selecting quarries, avoid sites with thick overburden layers, high clay content in interlayers, or poor-quality rock with layered, sheet-like structures.

3. Choose raw materials with exposed bedrock. If overburden or weathered layers are present, they should be promptly removed.

Common raw materials suitable for manufactured sand production include sandstone, quartz sandstone, river pebbles, construction waste, limestone, basalt, and granite.

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