Petrozavodsk State University (Petrozavodsk, Russia):

Aminov V. N., Head of Chair, Doctor of Engineering Sciences, Professor, otdmarket@petrsu.ru
Kameneva E. E., Head of Laboratory, Candidate of Engineering Sciences, Associate Professor, elena.kameneva@mail.ru

REC «Mekhanobr-Tekhnika» (St. Petersburg, Russia):
Ustinov I. D., Supervisor of the Research Training Center, Doctor of Chemiсal Sciences, ustinov_id@npk-mt.spb.ru

The primary objective of rocks physico-mechanical properties studies with a view to use rock materials for construction purposes is to determine their applicability in principle for crushed stone production. For this purpose, a number of rocks physical parameters are determined: strength, water absorption capacity, porosity, harmful components and impurities content, and others. If these parameters comply with the specified requirements, crushed stone size fraction 10–20 mm, obtained by crushing under the laboratory conditions, is subjected to testing. The test parameters are strength, abrasion strength, freezethaw resistance, bulk density and mineral density, water absorption capacity. As a rule, laboratory jaw crushers DSCH 60100 or DSCH 100200 are used for rocks geological samples crushing, providing for feed lump size within 50 and 90 mm, respectively, and producing required product size for subsequent tests. A high flakiness of crushed stone produced under laboratory conditions leads to underestimated values in main strength characteristics. In order to eliminate variances in size-fraction composition of crushed stone produced in conventional laboratory jaw crushers and crushed stone material produced on a commercial basis, a new laboratory jaw crusher 2 SCHDS 100200, developed at the Research-and-Engineering Corporation «Mekhanobr-Tekhnika», is proposed for application. This jaw crusher working organs are two jaws kinematically interlocked in synchronous operation, performing complex reciprocating and elliptical motion. This character of jaws motion provides for application of shearing and compressive forces to crushed material, resulting in product crushed stone with low fraction of flaky grains. This crushed product is in the main of cubic shape, possessing a granulometric characteristic close to product parameters of commercial-scale crushers, thus permitting to correctly compare physical properties of crushed stone produced commercially and under the laboratory conditions.
The studies were performed with the aid of the Russian Science Foundation Grant (Project No. 17-79-30056).

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