The standard of machine-made sand is the standard of construction sand, which is generally divided into natural sand and artificial sand. Rock particles with particle size less than 5mm formed by natural conditions of natural sand. Artificial sand, namely machine-made sand, refers to rock particles with a particle size less than 4.75mm that are mechanically broken and screened after soil removal. Sand specifications are divided into coarse, medium and fine according to fineness modulus.
The grain size distribution of sand refers to the proportion of sand size particles. If the sand is of the same thickness, the gap is larger. If the sand with two particle sizes is matched, the gap will be reduced. If the sand with three particle sizes is matched, the gap will be smaller. It can be seen that the porosity of sand depends on the matching degree of each particle size of sand. The sand provided can not only save cement, but also improve the compactness and strength of concrete and mortar.
The sand making machine series products developed and produced by SMMVIK Machinery are high-performance sand making machines that are more suitable for the requirements of building sand based on the in-depth study of the actual production situation of the sand yard. After years of development, a variety of models of sand making machines have been formed with vertical impact sand making machines, 6X series sand making machines, etc. as the core, and are welcomed by many sand yard customers.
The sand machine of SMMVIK Machinery has the characteristics of reasonable structure, low operation cost, high crushing rate, energy conservation and environmental protection, excellent grain shape of finished products, low iron pollution, low noise, less dust pollution, etc., and the fineness modulus can be adjusted. The sand and stone materials produced by the machine are reasonably proportioned, which widely adapt to the sand and stone aggregate standards required for high-speed railway, expressway, hydropower port construction, concrete mixing station, etc, and strengthen the quality of infrastructure projects.
1. The demand of the mine configuration for the particle size of crushed materials is fine. Needle and flaky materials enter the mill and are easier to be ground. The demand for crushed stone is contrary to the above, and the demand for its particle type and size is also strict. The reason is that the cubic sand has an edge angle, so there is a mutual locking effect between its particles.
2. Specification of machine-made sand: the specification of sand is divided into coarse, medium and fine according to fineness modulus. The fineness modulus of coarse sand is 3.7~3.1, that of medium sand is 3.3~3.0, and that of fine sand is 2.2~1.6.
3. According to the definition of machine-made sand: rock particles with particle size less than 4.75mm are mechanically broken and sieved after soil removal. However, it does not include particles of soft rock and weathered rock.
4. Materials for machine-made sand: generally, the materials for sand making include granite, basalt, natural river pebbles, andesite, rhyolite, diabase, diorite, sandstone, limestone, etc. The sand made of it has different strengths and uses according to the different types of rocks, and different sand making machines are selected.
