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Description
Owing to high consumer properties of the crushed rock obtained through impact-centrifugal crushers, its cubiform shape as well as the advanced surface activity of the particles, its application at concrete production, highway engineering, at manufacture of building constructions makes it possible to reduce significantly material and technical resources, to increase the quality of the articles produced.

Technology Type
Process

Technology Benefits
At road construction[br][/br][br][/br]In road surface building of great and special importance is a shape of pebbles 2-5, 5-10, 10-15 mm in size which is used for an upper strengthening layer of the road surface. The layer defines the longevity and quality of the road.[br][/br]The application of cubiform crushed rock at highway engineering and manufacturing of building constructions makes it possible:[br][/br]-􀂃 to reduce crushed rock consumption[br][/br]-􀂃 to reduce bitumen and emulsions consumption up to 30%[br][/br]-􀂃 to reduce time and labour expenditures up to 50% at placing asphalt concrete surfacing[br][/br]-􀂃 to reduce cement consumption[br][/br]-􀂃 to increase several times the service life of a road surface[br][/br]-􀂃 to increase a cohesion factor up to 0,65-0,71.[br][/br][br][/br]In production of concrete[br][/br][br][/br]To ensure a high quality of concrete of great importance is a shape of particles of coarse aggregate (crushed rock). It is not to have more than 15% (as to mass) of the grains having a plate-like and a prickly shape.[br][/br]The conducted tests showed that the application as aggregate of crushed rock obtained by impactcentrifugal crushing makes it possible:[br][/br]-􀂃 to reduce water requirement of concrete mix by 3%[br][/br]-􀂃 to reduce cement consumption by 5-10 kg/m3[br][/br]-􀂃 to improve the strength of concrete[br][/br]-􀂃 to cut energy expenses for manufacture by 2,5% on the average, to reduce concrete prime cost by 3% on the[br][/br]average.[br][/br]It was determined that the application of cubiform crushed rock resulted in the reduction of cement[br][/br]consumption per unit durability of concrete by 12,5%.

Technology Differentiation and Uniqueness
Improved quality of conventional building materials.

Context in which technology was identified
The technology in question as well as the equipment which is manufactured by «NPO Center» are successfully applied while producing cubiform crushed rock from porphyrite, diorite and other materials for highway engineering in Belarus, Russia, Ukraine and Kazakhstan.

Technological Keywords
cubiform crushed rock

Development Stage
Currently in use/production

Range of Applications
The technology is used to produce cube-shaped crushed stone, used as a filler in asphalt concretes and concretes, as well as in road construction.

Classifier Used at the Enterprise Europe Network
Sustainable Construction

Preferable Regions
Europe
Asia

Practical Experience
The technology has been successfully introduced to produce high-quality cuboid crushed stone from granite, dolomite, etc.

Environmental Impact
None.

Type of Collaboration Sought
Other: Sale of equipment for technology.

Terms&Restrictions
The technology is not transferred.

Available Technical Assistance
Other: The technology is not transferred.