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Production of Cube-shaped Crushed Stone

Aspects of Cube-shaped Crushed Stone Production


Aspects of Cube-shaped Crushed Stone Production

The quality and value of the obtained concrete and asphalt composition is largely dependent on the properties of aggregates used, namely crushed stones. An increase in bulk density and decrease in cavitation allows obtaining asphalt concretes with a more compact structure and lower discharge. It is necessary to note a number of technological aspects of exploitation of cube-shaped gravel for road construction: firstly it is a tangible reduction in consumption of asphalt binders during production of asphalt concrete (according to ROSDORNII Sverdlovsk center) this reduction can be up to 15% from the binder weight; less number of roller passages to achieve the required density of asphalt pavement because of the higher density of bituminous mixture itself, etc.

The quality of crushed stone used in concrete production and road construction is to a large extent determined by the shape of its grains. Grain shape of crushed stone depends on two main factors: the structure of the rock and the type of crushing equipment.

Possible solution to the problem of obtaining high-quality aggregates is the use of modern and highly efficient equipment in crushing and screening complexes.

Analysis of the crushed stone production technology, the effects of material processing stages and equipment used on the quality and cost of the final product show that:
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    • the basic cost of producing crushed stone is formed in the early stages of crushing, screening and transporting of materials. This applies to both the initial cost of equipment (depreciation) and to the costs of maintenance, repairs, spare parts, etc.
    • product quality of the whole processing line is defined by the crushing equipment installed at the last stage of crushing.

 

In course of design of new lines for crushed stone processing or upgrading of the existing crushed stone, special attention should be paid to the drilling equipment at the last stage and its impact on the economic and qualitative characteristics of the line.

The research carried out by our company and experience of commercial operation of crushers shows that the use of crushers DC at the last stage of crushing can put product quality of all the lines in line with modern requirements for aggregates. For example, if we install DC into a current line of crushed stone processing of groups 4-5 in form of grain, you may receive the crushed stone groups 1-2 (GOST-8267-93).

The traditional widely used jaw and cone crushers allow to obtain crushed stone with poor content of bladed form (in fact > 20%).
DC installation in a processing line at the last stage of crushing can significantly improve the quality of the product and bring it in line with modern requirements for aggregates.

The operation experience has shown that the crushed stone obtained as a result of the use of crushers DC is characterized by dramatically improving performance.


A typical characteristic of the crushing product DC: grain shape

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    • grain form - refers to a cube-shaped grain, the yield of such grain is no less than 88% even in fractions of 5-10 mm. This is due to the fact that the nature of the movement of said crushed material in crusher leads to the effective destruction of bladed and needle-shaped grains present in the source material, and a corresponding increase in the number of cube-shaped grains.
    • change in the grain form in the resulting material is naturally accompanied by an increase in the strength of crushed stone (depending on the properties of the rock increases from 15 to 30%), the average change in performance, and a bulk density of emptiness.

An example of obtaining high-quality aggregates required in today's road construction may be the use of centrifugal crushers DC. Today this crushing equipment is the most popular in the road construction industry because it allows getting first category crushed stones of most types of rocks. The equipment for many years has been used by many companies in the sector of road construction: OAO Avtodorstroy, OAO Severavtodor, OAO KraiDEO, OAO Russian Railways, SUE Chelyabinsk Highway Administration, the largest suppliers of cube-shaped crushed stone for construction of roads and motorways of OAO Orskoe karieroupravlenie, OAO Ural Asbestos, etc.

 

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