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Alpha Cement Constituent
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Alpha cement constituent is a high specification pozzolan derived from fly ash.
Key benefits of Alpha are:
It exceeds the specifications required for BS EN 450-1:2005.
It is predominantly composed of spherical aluminosilicate particles.
It has a low residual carbon content.
It has a similar particle size distribution to CEM1.
It has a consistent colour.
It has a low unit cost.
It provides continuous strength development in concrete in combination with CEM1.
It imparts improved durability and chemical resistance to concrete.
Is available in dry powder form for collection from our silos
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| Alpha cement constituent has the following guideline specifications: |
| Parameter |
Value |
| Retained on a 45 micron sieve - % |
<7% (EN450 - Category S <12%) |
| Loss on ignition at 950°C |
typically 5% (EN450 - Category A) |
| Particle density |
2200-2400kg/m3 |
| Sulphate content as SO3 |
<1% |
| Chloride ion content |
<0.1% |
| Bulk density |
800-1000 kg/m3 |
| BS EN450 Pozzolanic Activity Index (90 days) |
95-115% (EN450 - 90 day 85%) |
| BS EN450 Water requirement |
<95% of control |
| Free CaO content |
<1% |
| Na2O equivalent |
<3% |
| Soluble P2O5 |
<5mg/kg |
| Reactive silica |
>30% |
| Total SiO2+Al2O3+Fe2O3 |
>80% |
Typical Oxide Analysis
| Oxide |
Value
(%w/w)
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Oxide |
Value
(%w/w)
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| Al2O3 |
25-28 |
Mn3O4 |
<0.1 |
| CaO |
3-5 |
V2O5 |
<0.05 |
| Fe2O3 |
4-5 |
Cr2O3 |
<0.05 |
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K2O
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2-4 |
BaO |
<0.2 |
| MgO |
1-2 |
ZrO2 |
<0.05 |
| Na2O |
<1 |
ZnO |
<0.05 |
| P2O5 |
<1 |
SrO |
<0.2 |
| SiO2 |
50-56 |
TiO2 |
1-2 |
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RockTron Ltd Wessex House Pixash Lane Keynsham Bristol BS31 1TP
Tel: +44 (0)117 937 6890 Fax: +44 (0)117 986 6870
www.rktron.com
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