Concrete, as the most widely used building material, occupies a core position in China’s infrastructure field.
In 2021, China’s concrete production reached a peak of 3.
3 billion cubic meters, of which fine aggregates accounted for over one-third.
However, as a traditional fine aggregate, natural river sand is a non renewable resource, and its mining not only incurs high costs, but also faces the problem of increasingly depleted resources.
In this context, mechanism sand has become an ideal alternative material due to its abundant resources, simple preparation process, and economic advantages.
However, its inherent problems such as strong particle angularity, poor gradation continuity, and high stone powder content limit its application in high-grade concrete structures such as bridges.
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