SBM sand making machine's six requirements for sand and gravel
VSI sand making machine is a kind of widely used mechanical equipment, which plays an important role in the sand making, crushing and rough grinding industries, but the most used one is the sand making industry. Since the companies that produce the equipment are mostly mining machinery manufacturers, there are certain requirements for sand and gravel.
1. The particle requirements for the broken material are fine. In general, the requirements for the needle shape are not strict. The reason for the strict grain size and grain size of the ore is that the cubic sand is the best for concrete and asphalt. The machine-made sand not only increases the strength of the concrete, but also reduces the amount of cement. Secondly, the cubic sand has an interlocking effect on the particles due to the angular edges.
2. According to the definition of the mechanism sand, the rock particles with a particle size of less than 4.75 mm, which are made by mechanical crushing and sieving, are not included in the soft rock and weathered rock.
3. The specifications of sand are divided into coarse, medium and fine according to the fineness modulus. The fineness modulus of the coarse sand is 3.7~3.1, the fineness modulus of the medium sand is 3.0~3.3, and the fineness modulus of the fine sand is 2.2~1.6.
4. The grade of sand is divided into three grades according to its technical requirements: I, II and III. Class I sand is suitable for concrete with strength grade greater than C60, Class II sand is suitable for concrete with grades C30~C60 and anti-freeze, impermeability or other requirements, and type III sand is suitable for concrete with less than C30 strength and construction. mortar.
5, the particle size of sand is between 4.75 ~ 0.15mm, and the stone powder less than 0.075mm should have a certain limit, its particle size is 4.75, 2.36, 1.17, 0.60, 0.30, 0.15, preferably continuous, and each There must be a certain percentage of a grade, and the particle size is preferably a cube, and there are certain requirements for the amount of the needle.
6. sand making machine rocks generally include granite, basalt, natural river pebble, andesite, rhyolite, diabase, sandstone, limestone, etc. The sand produced by the sand has different strengths and different requirements depending on the rock type.
3. The specifications of sand are divided into coarse, medium and fine according to the fineness modulus. The fineness modulus of the coarse sand is 3.7~3.1, the fineness modulus of the medium sand is 3.0~3.3, and the fineness modulus of the fine sand is 2.2~1.6.
4. The grade of sand is divided into three grades according to its technical requirements: I, II and III. Class I sand is suitable for concrete with strength grade greater than C60, Class II sand is suitable for concrete with grades C30~C60 and anti-freeze, impermeability or other requirements, and type III sand is suitable for concrete with less than C30 strength and construction. mortar.
5, the particle size of sand is between 4.75 ~ 0.15mm, and the stone powder less than 0.075mm should have a certain limit, its particle size is 4.75, 2.36, 1.17, 0.60, 0.30, 0.15, preferably continuous, and each There must be a certain percentage of a grade, and the particle size is preferably a cube, and there are certain requirements for the amount of the needle.
6. sand making machine rocks generally include granite, basalt, natural river pebble, andesite, rhyolite, diabase, sandstone, limestone, etc. The sand produced by the sand has different strengths and different requirements depending on the rock type.
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