Standard for sand and gravel materials required by the second phase project of expressway

The second phase project of expressway requires sand and gravel standards. The grain size of sand is 4.75mm ~ 0.15mm, which is generally composed of square mesh 4.75, 2.36, 1.18, 0.6, 0.3 and 0.15mm, and there are certain requirements for the percentage of its specifications. The second phase of the expressway project mainly requires the use of machine-made sand. The machine-made sand production machinery mainly includes vertical composite crusher, vertical crusher, composite crusher, ring hammer crusher, crusher, impact crusher, double tooth roll crusher and other crushing machinery.

The research and development team of SMMVIK, in view of the vulnerability of the crushing machinery of the sand and gravel crusher required in the second phase of the project, adopted new steel materials with high compressive strength and wear resistance, which greatly improved the service life of the sand and gravel crusher required in the second phase of the expressway project, and broke the bad luck of the ultra short service life of the crushing and grinding machinery.