Product · Materials Science
Product · InnDex 52 · Evidence provided · High specification risk
Rapid-quench conversion of EAF steel slag into high-reactivity cement replacement material.
Cocoon Carbon transforms molten electric-arc-furnace (EAF) steel slag into a glassy supplementary cementitious material (SCM) using proprietary rapid-quench hardware, positioning it as a direct replacement for ground granulated blast furnace slag (GGBFS). It addresses two concrete industry pain points: end-of-life disposal cost/liability for steel mills and embodied carbon in Portland cement binders. ASTM C1912/C1709 testing demonstrates 30% replacement achieves strength parity with GGBFS; technology demonstrated at TRL 6 (Q2 2025) with first commercial facility targeting 100–300k tonnes/year.
Cocoon Carbon converts molten electric-arc-furnace steel slag into a glassy supplementary cementitious material using proprietary rapid-quench hardware, positioning it as a direct replacement for GGBFS — simultaneously addressing the steel industry's slag disposal liability and the concrete sector's Portland cement embodied-carbon load. ASTM C1912/C1709 testing at 30% replacement demonstrates strength parity with GGBFS, and the product reached TRL 6 in Q2 2025 with a first commercial facility targeting 100–300k tonnes per year. The circular economy logic is strong: EAF steel production generates waste that currently requires disposal management, and rapid-quench can recover it as a binder that substitutes for a globally constrained GGBFS supply chain — the feedstock-to-product chain is rational and the technology demonstrated. The practical constraints are geographic and compositional: feedstock availability is tied to EAF steel capacity in the region, which is absent or limited in markets dominated by BOF integrated mills, and EAF slag composition varies by scrap input and flux chemistry, requiring per-source tuning of the quench process. Long-term durability in aggressive exposure environments — high chloride, sulfate — is not yet established beyond the ASTM test programme, which matters for infrastructure and marine applications. For concrete producers and specifiers in regions with strong EAF capacity, this is worth qualifying as a GGBFS alternative; the mix re-qualification burden is real but not prohibitive, and the supply-chain diversification value is genuine.
Strength testing via ASTM C1912/C1709 is credible but lab-scale; no published EPD, LCA, or third-party lifecycle assessment found. The headline 27% CO₂ reduction claim and 10M tonne avoidance projection by 2032 are unverified and appear marketing-forward with no audit trail. TRL 6 demonstration is genuine but not yet commercial deployment. Series A funding is factual. Supply/reactivity parity with GGBFS is claimed but long-term durability (carbonation, chloride ingress) over decades not yet published. Slag composition variability from EAF is a known issue in cementitious use—risk mitigation strategy not disclosed.
#concrete #slag_upcycling #SCM #embodied_carbon #EAF_steel #circular_economy