Crushed stone from dense rocks for a bed of a railway track

The crushed-stone plant makes elimination of fraction of 0-5 mm, crushed stone fractions 5-20, 3-10 and 20-40 of mm according to GOST 8267-93 "Crushed stone from dense rocks for construction works" and 8736-93 "Sand for construction works", and also crushed stone of fraction 5-25 and 25-60 according to GOST 7392-2002 "Crushed stone from dense rocks for a bed of a railway track".

Laboratory researches established the following physicomechanical properties of breeds:

Volume weight in the loosened state	1,3-1,4 t/m3
Volume weight in a dense body	2,08-2,24 t/m3
Loosening coefficient	1,6
Water absorption	0,5-1,94% (1,2%)
Frost resistance	MRZ-150
Resilience to blow on a copra	PM OF "U-110"
Resistance to compression	I-1200 brand
In a dry state	2364 kg/cm2
In a water-saturated state	1918 kg/cm2
Crushed stone Leshchadnost	2-6,3%
Maintenance of clay and dust-like particles
In small crushed stone	1%
Fortress coefficient on Construction Norms and Regulations	IX - X
Coefficient on Protodyakonov's scale	II
Fortress coefficient	12 - 14