Inconsistent fillers and energy-intensive materials raise costs and emissions. Gudvangen anorthosite stabilises the mix for stronger, lighter and more
sustainable concrete.
CONCRETE
Lower CO₂ Footprint
Anorthosite can replace part of the clinker or filler, reducing both process emissions and total energy demand.
CONCRETE
Stronger, Longer-Lasting Mixes
High alumina and calcium improve bond strength and durability, reducing microcracks and chemical wear over time.
CONCRETE
Consistent Performance
Natural, homogeneous chemistry ensures uniform reactivity and predictable setting behaviour across batches.
CONCRETE
Cleaner Colour and Finish
Very low iron keeps the mix light and consistent — ideal for visible concrete and architectural surfaces.
Property / Parameter | Anorthosite (Gudvangen) | Limestone (CaCO₃) | Fly Ash (Class F) |
|---|---|---|---|
Main Function | Pozzolanic filler and clinker substitute | Filler and Ca-source | Pozzolanic additive |
Main Oxides (wt%) | SiO₂ ≈ 50 / Al₂O₃ ≈ 30 / CaO ≈ 14 | CaO > 50 | SiO₂ 50–60 / Al₂O₃ 25–35 |
Fe₂O₃ Content | Very low (~0.5 %)* | < 0.5 % | 5–10 % |
CO₂ Emissions (processing) | Very low — electric mining, no calcination | High — CO₂ from calcination | Low — industrial by-product |
Reactivity | Moderate pozzolanic (Al–Ca active) | Non-reactive | Good pozzolanic |
Effect on Strength | Improves long-term strength and durability | Neutral | Improves later-age strength |
Colour / Appearance | Bright and uniform | White | Grey-black |
Supply Stability | High — primary rock | High — quarry | Declining — dependent on coal plants |
* After on-site magnetic separation.
FEATURES
Strength in Every Detail.
From mineral balance to delivery route, every factor works together to make Gudvangen anorthosite a stronger, cleaner and more consistent
Gudvangen anorthosite contains ~30 % Al₂O₃ and ~14 % CaO, creating a natural pozzolanic reaction that supports C-A-S-H gel formation and improves long-term strength.
Fe₂O₃ ≈ 0.5 % after magnetic separation and TiO₂ < 0.3 % keep hydration reactions stable and surface colour bright — a clear advantage for white and architectural concretes.
When finely milled (< 20 µm), anorthosite acts as an active mineral filler, refining pore structure and reducing permeability.
Stable up to > 1 000 °C, the mineral resists thermal cracking and chemical expansion, supporting durability in high-temperature or industrial structures.
Produced in controlled fractions — from ultra-fine powders to coarse aggregates — ensuring consistent quality and predictable performance for every industrial process.
The Gudvangen site connects directly to deep-water shipping routes, providing efficient, low-emission bulk transport to industry across Europe.
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— from raw material to final mix.
