Crushed stone calculator →
Tonnes ↔ m³ by fraction and number of railway wagons (69 t each).
Crushed stone density →
Bulk vs true density, table by fraction, m³ ↔ tonnes conversion.
Crushed stone per wagon →
Tonnes and m³ per gondola, dump car and truck. Table by fraction.
Glossary: key terms
Fraction
Grain size of crushed stone in millimetres, e.g. 5-20 mm means particles from 5 to 20 mm. The tighter the fraction, the more stable the material properties.
Cubicity (grain shape)
Ratio of grain length, width and height. The ideal is a cube (1:1:1). Per GOST 8267-93 crushed stone is split into 5 groups: Group I (≤10% flaky grains) is cubic, Group V (>50%) is flaky. HKC produces Group I.
Flakiness
Share of flat or needle-shaped grains (3+ times longer). The lower it is, the denser the packing in concrete/asphalt. HKC ≤10% — Group 1 cubicity.
Strength (M-grade)
Resistance to crushing. M1400 is the highest class. Concrete M400+ needs crushed stone of M800+. Diabase M1400 qualifies for all concrete grades.
Frost resistance (F)
Number of freeze-thaw cycles without strength loss. F300 means 300 cycles — optimal for Northern and Western Kazakhstan with sharp seasonal swings.
Abrasion (I1-I4)
Wear resistance under friction. I1 is the highest. Top-layer asphalt and airfields require I1. HKC crushed stone is I1.
Radiation safety
Class per GOST 30108: Class I (up to 370 Bq/kg) — unrestricted for residential/civil construction. HKC is Class I.
Crushed stone–sand mix (ЩПС)
A mix of crushed stone and screenings in one fraction (0-40, 0-70, 0-80 mm) for road bases. Types C1-C13 per ST RK 1549-2006.
6F / 6F(D)
Coarse granular material to a British standard adapted in oil & gas EPC projects — capping layers and sub-base under industrial sites, airfields and access roads.
Rubble stone
Large stone (150-500 mm and over) for foundation masonry, gabions, bank protection and landscaping.
Density and weight by fraction
Bulk density of HKC diabase crushed stone by main fraction. Values are indicative — exact figures are confirmed by the batch quality passport.
| Fraction | Bulk density, t/m³ | Range by batch |
|---|---|---|
| 5-10 mm | 1,52 | 1,50–1,55 t/m³ |
| 5-20 mm | 1,48 | 1,45–1,55 t/m³ |
| 10-20 mm | 1,45 | 1,42–1,50 t/m³ |
| 20-40 mm | 1,42 | 1,40–1,48 t/m³ |
| 25-60 mm | 1,40 | 1,38–1,45 t/m³ |
| 40-70 mm | 1,38 | 1,36–1,42 t/m³ |
| 0-5 mm (screenings) | 1,55 | 1,50–1,60 t/m³ |
| 0-40 mm (mix) | 1,60 | 1,55–1,65 t/m³ |
| 0-70 mm (mix) | 1,62 | 1,58–1,68 t/m³ |
| 0-80 mm (mix) | 1,65 | 1,60–1,70 t/m³ |
Applicable standards
Crushed stone and gravel from dense rock for construction. Technical requirements.
Crushed stone–gravel–sand mixes for road and airfield surfaces and bases.
Crushed stone from dense rock for railway track ballast.
Non-metallic materials from crushing screenings of dense rock. Technical requirements.
Construction materials. Determination of natural radionuclide activity.
Crushed stone–sand mixes. Technical requirements (national standard of Kazakhstan).
Frequently asked questions
How many tonnes of crushed stone are in 1 cubic metre?
For diabase crushed stone the bulk density is 1.38–1.55 t/m³ depending on fraction. Fine fractions (5-10, 0-5) ~1.5 t/m³; coarse (40-70) ~1.38 t/m³. See the density table below.
Which fraction suits concrete M400?
For concrete M400+ the best fractions are 5-20 mm (universal, thin structures) and 20-40 mm (heavy structures). Strength must be at least M800; HKC diabase M1400 has a large margin.
How is crushed stone different from gravel?
Crushed stone is produced by crushing hard rock — it has sharp edges and better bonding in concrete and asphalt. Gravel is rounded river/sea material with lower strength. Loaded structures use only crushed stone.
Which crushed stone suits railway ballast?
Per GOST 7392, ballast uses fraction 25-60 mm from dense rock with M1200+ strength. HKC diabase M1400 is optimal; the cubic shape keeps sleepers in place.
What is the advantage of cubic crushed stone?
The cubic shape gives dense packing: in concrete it saves up to 10% cement for the same grade; in asphalt it improves binder adhesion and extends service life. HKC is 100% cubic as standard.