Biomass-derived carbon is being investigated as a concrete and cementitious-material additive. Published cement-paste research has examined effects such as internal curing and shrinkage. These results create worthwhile questions for development; they are not blanket approval to substitute any char into a structural mix.
Start with the finished material
The commercial question is whether a specific formulation meets the requirements of a specific product. A precast landscaping element, a nonstructural panel and load-bearing concrete have different performance and approval needs. Define that end use before choosing an additive.
Build an evidence package
A development program should compare a proposed mix with a suitable control and document the entire formulation. Our proposed evaluation framework includes workability, strength development, density, water demand and relevant durability testing. Particle size, moisture conditioning, mixing sequence and dispersion also need repeatable procedures.
- Specify whether the carbon is an addition or replaces another constituent.
- Track performance at the same functional requirement, not merely the same mass.
- Assess batch consistency, contamination and handling.
- Establish which testing and approvals the intended product requires.
Keep the carbon claim separate
Adding biogenic carbon does not by itself prove a lower-carbon product. A lifecycle comparison needs a defined boundary, credible production data and the same delivered function. Any carbon-credit claim has its own eligibility and accounting requirements.
Nova welcomes conversations with concrete producers, formulators and testing partners interested in qualifying a material for a real application. The first milestone should be a useful specification and a test plan.
Sources & further reading
- ACS Sustainable Chemistry & Engineering — Biochar in cement paste
- Verra — Biochar methodology update
General educational commentary. External research is not a Nova performance claim or affiliation. Sources reviewed October 1, 2026.