Crushed stone
DSTU B В.2.7-75-98:
|
|
Parameter |
The diameter of the control sieve cells, which corresponds to the grain size, mm |
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|
d |
0,5 (d + D) |
D |
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|
1 |
0 - 20 mm |
90 - 100 |
30 - 80 |
> 10 |
|
2 |
5 - 20 mm |
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|
3 |
20 - 50 mm |
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- The content of pulverized, clayey and silty particles: not more than 2%;
- The limit of mechanical strength of crushed stone at compression is not less than 60 MPa;
- Frost resistance - F50;
Maximum permissible concentration and hazard class of crushed stone in the air of the working area:
|
Сomponent |
Controlled aerosol location |
Value of MPC, mg / m3 |
Hazard Class |
Designation of the standard |
|
Carbonate-silicate dust |
Air of working area |
6,0 |
4 |
ГОСТ 12.1.005 |
|
Atmospheric air |
0,5 |
3 |
ДСП-201 |