Shanghai Xuanshi Machinery Co.,Ltd.



Crushing Mining Solution

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Coarse aggregate (stone) classification: pebble, . Building pebbles and gravels new national standard makes the classification, specification, type and use clear. Both the building pebbles and gravels have three categories, which are used concrete in each level(Less than C30 level or more than C60 level). For alkali aggregate problems of sand and stone, the new standard all make provisions.

1、Harmful impurities: clay, silt, fine powder, sulfate, sulfide and organic impurity, which are in compliance with regulations.

2、The particle shape and surface features: Gravels have rough surface and air voids and the gravels can bond with the cement in a well condition, but the workability is not so good. Pebbles bond with the cement in a bad condition but the mixture workability is very well. The coarse aggregate whose width and length and height are nearly same is the most suitable material. Needle-shape or sheet-shape grains under stress are easily broken, which will increase voidage, so that the workability will be bad. for these reasons, the materials selection is very important.

3、Maximum size and particle grading
If the grain size is increased, the specific surface area will be decreased so the cement quantity can also be decreased. For this reason, the grain size should be large as much as possible. But the size should not be too large for the size is restricted by measurement and reinforcement so the grains with large size (over 40mm) is not so good. Maximum grain size must not be more than 1/4 of the minimum side length of structure section and not be more than 3/4 of the rebar smallest interval. For solid sheet, the grain size can reach the 1/2 of the plate thickness but should not be more that 50mm.

XSM Machinery crusher device

Crusher and sand making machine can form the sand producing line. When stone crushing, the primary crushing device mainly is crusher and adjustment can be done according to the particle size of materials.

XSM Machinery crusher devices mainly conclude , impact crusher, hammer crusher and cone crusher, etc. The coarse aggregate is the crushed aggregate whose grain size is more that 4.75mm, called aggregated rock. The common used aggregates are gravels and pebbles, gravels are the natural rocks or rocks that come through mechanical crushing and screening, whose grain size is over 4.75mm. Pebbles are formed by natural weathering, water flow handling and separation and accumulation and the grain size is also more than 4.75mm. XSM Machinery crusher devices can produce the building pebbles and gravels, which can meet technical requirements of the national standard GB/T 14685-2001 << "building pebbles and gravels" >>. The choice range of materials is very wide. Ordinary ores can be processed by corresponding processing equipments. Finished products can meet the demands and can used for buildings.

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