With the continuous expansion of infrastructure, the demand for raw materials for concrete is also increasing.
As one of the six major components of concrete, fine aggregate is in short supply.
However, in recent years, due to the scarcity of natural sand resources and environmental restrictions, its usage cost has become increasingly expensive.
Therefore, machine-made sand has been widely used, especially in Chongqing, where limestone resources are abundant.
Almost all commercial concrete mixing plants in the region are using machine-made sand for concrete production.
Mechanized sand is produced through mechanical crushing, with a controllable production process and minimal environmental pollution, while also protecting natural resources.
However, the quality of mechanism sand has many influencing factors on the production quality of concrete, such as fineness modulus, stone powder content, MB value, etc.
In the technical management process of commercial concrete mixing plants, it was found that the stone powder content and MB value fluctuated greatly, which had a significant impact on production quality control.
Therefore, it is necessary to study the influence of sand and gravel powder content and MB value on the performance of concrete.
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