Acceptance standard for sand and gravel materials of expressway

The acceptance standard of sand and gravel for expressway is relatively strict, and there are strict regulations on particle type, particle size, hardness, water content and other aspects. Most of the highway sand and gravel use machine-made sand, because the particles of machine-made sand are cubes with edges and corners, and most of the natural sand particles have been rounded. The machine-made sand has a larger specific surface area than the natural sand, so the concrete prepared with machine-made sand has higher strength. For asphalt concrete, the edges and corners of machine-made sand are also interlocked to make asphalt concrete more firm and stable. The production of machine-made sand can be combined with the production process of building stone (coarse aggregate), which is conducive to the comprehensive utilization of good mineral resources, reducing pollution, and greatly reducing the production cost of machine-made sand.

While SMMVIK products are saving energy, SMMVIK is also constantly increasing its control over product quality. Our products should not only save energy, but also strictly control the quality. Through the application of new technologies, SMMVIK crushing equipment is in the forefront of the crusher industry.