Every kg of limestone fines that displaces a kg of cement clinker takes ~0.85 kg CO₂ out of the mix. At 15–20 % cement substitution in a typical 320 kg/m³ binder, that's 35–55 kg CO₂ per cubic metre, with EN 206-1 compliance intact and zero impact on 28-day strength.
Concrete is responsible for ~8 % of global CO₂ emissions; cement clinker is ~85 % of that footprint per cubic metre. Limestone fines are the only supplementary cementitious material with reliable long-term European supply at scale — fly ash supply has collapsed with coal phase-out, and GGBS is tightening as European steel decarbonises. FormaCalx is how you make the substitution happen without compromising the technical performance your customers buy.
