Paebbl’s Rebond 300 cement alternative: performance and design notes for engineers
Reviewed by Joe Ashwell
First reported on The Construction Index
30 Second Briefing
Paebbl has launched Rebond 300, a near‑white, carbon negative cement alternative with a footprint of -149kg CO2 per tonne that can replace up to 30% of conventional cement in standard mixes. The SCM-based binder delivers up to 40% reduction in embodied carbon at typical replacement ratios, a 10x improvement over Paebbl’s first‑generation material, while remaining compatible with existing ready‑mix and precast workflows. The Rebond Series is formulated to work across a family of silicate minerals and uses lower clinker process temperatures, reducing heat demand and permanently storing CO2.
Technical Brief
- Rebond 300’s near-white colour allows exposure as an architectural finish without additional coatings.
- Supplementary cementitious materials are the primary reactive phase, reducing reliance on traditional Portland clinker.
- Permanent CO₂ storage is achieved by mineral binding within a silicate-based matrix rather than reversible carbonation.
- The Rebond Series is engineered to accept multiple silicate mineral feedstocks, improving raw material sourcing flexibility.
- Lower clinker process temperatures directly cut kiln heat demand, with knock-on reductions in fuel-related emissions.
- Compatibility with existing ready-mix and precast workflows avoids new batching, mixing or curing plant investment.
Our Take
The earlier 2026 piece on Paebbl’s olivine-based substitute highlighted pilot work with Dutch contractors Hakkers and Heijmans, suggesting Rebond 300 may now be targeting specification-ready mixes that can slot into mainstream UK and EU infrastructure supply chains rather than just demonstration pours.
A claimed –149 kg CO2 per tonne footprint and up to 40% embodied carbon reduction positions Paebbl at the extreme end of the 44 Materials stories in our coverage, where most cementitious ‘low‑carbon’ products are still only offering incremental cuts rather than net‑negative performance.
The 30% cement replacement ceiling for Rebond 300 implies that, in practice, large projects in the United Kingdom will need to combine it with other SCMs or design changes to hit deep decarbonisation targets, which could complicate mix design and standards compliance for conservative specifiers.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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