Fly ash
Fly-ashes produced by ČEZ, a.s. are certified construction material. In general, all fly-ashes can be further used, e.g. for the production of binding, firebrick products, mineral fibres, asphalt products, etc.
Fly-ashes produced by ČEZ, a.s. are certified construction material for the following use with guaranteed characteristics of the individual products:
Fly-ash as the main part of cement in compliance with ČSN EN 197-1
|
Loss on ignition (LOI) |
max.5 % hm. |
|
Amount of sillicon dioxide |
min. 25 % hm. |
|
Amount of active calcium oxide |
max. 10 % hm. |
|
Amount of free calcium oxide |
max. 1 % hm. |
|
Weight activity Ra 226 |
max. 300 Bq/kg |
|
Mass activity coefficient I |
max. 2,0 |
Fly-ash as a filler to concrete in compliance with ČSN EN 12620
|
Loss on ignition (LOI) |
max. 5 % of weight |
|
Amount of all sulphur |
max. 1 % |
|
Amount of chloride |
max. 0,1 % of weight |
|
Granularity (undersizes of screen of 2 mm) |
100 % |
|
Granularity (undersizes of screen of 0,125 mm) |
85 - 100 % |
|
Granularity (undersizes of screen of 0,063 mm) |
70 - 100 % |
|
Weight activity Ra 226 |
max. 300 Bq/kg |
|
Mass activity coefficient I |
max. 2,0 |
Fly-ash to concrete in compilance with ČSN EN 450-1
|
Loss on ignition (LOI) |
max. 5 % of weight |
|
Amount of chloride |
max. 0,1 % of weight |
|
Amount of sulphur trioxide |
max. 3 % of weight |
|
Amount of free calcium oxide |
max. 2,5 % of weight |
|
Active calcium oxide |
max. 10 % of weight |
|
Fineness (oversize of a screen 0,045 mm) |
max. 40 % |
|
Efficiency index after 28 days |
min. 75 % |
|
Efficiency index after 90 days |
min. 85 % |
|
Specific weight |
Stated value ± 200 kg/m3 |
|
Volume stability |
max. 10 mm |
|
Weight activity Ra 226 |
max. 300 Bq/kg |
|
Mass activity coefficient I |
max. 2,0 |
Fly-ash to porous concrete
|
Loss on ignition (LOI) |
max. 4 % of weight |
|
Amount of sillicon dioxide |
min. 45 % of weight |
|
Amount of sulphur trioxide |
max. 2 % of weight |
|
Amount of calcium oxide |
max. 5 % of weight |
|
Amount of sodium oxide |
max. 1,5 % of weight |
|
Specific weight activity Ra 226 |
max. 300 Bq/kg |
|
Mass activity coefficient I |
max. 2,0 |
All fly-ashes can be further as material for the production of the following:
- Mixtures bonded by hydraulic binders in the meaning of ČSN EN 14227
- Porous gravel in the meaning of ČSN EN 13055
- Fly-ash mixtures
- Base mixtures for gap filling after coal mining activities
- Binders
- Baked brick products
- Inorganic fibres
- Asphalt products
- Artifical gravel
- Fire sand
- Geopolymer
Moistened fly-ashes can be used as backfill of secondary material for filling, backfilling and building of land formation in the meaning of ČSN 73 6133 a technical parameteres of MDS TP 93
Note:
Links to particular power stations that possess valid certificates for the following use of fly-ash:
Fly-ash to the main cement compound according to ČSN EN 197-1
EDE, EME, EPC
Fly-ash as a filler to cement according to ČSN EN 12620
EME, EPC
Fly-ash to cement according to ČSN EN 450-1
EDE, ELE, EME
Fly-ash to porous concrete
EDE, EPC, EME
Fly-ash exploited from settling basin – according to ČSN 73 6133 a TP 93
TDK
Storage:
Fly-ash is stored in silos, alt. as a dumping site.
Filling sites:
Place of consumption to auto-silos – EPO, EPC, EME, ELE, EHO, EDE
Place of consumption to cars – EPR, EME, EDE