CarbonStone Aggregate: Ex-Situ Mineralized Carbonate Aggregate for Permanent CO₂ Disposal in Construction and Landscaping

CarbonStone Aggregate is a conceptual framework and proposed material system for permanent carbon dioxide (CO₂) disposal via ex-situ mineralization, developed by Planetary Energy Systems Pty Ltd and disclosed in this 2026 white paper by Samuel Jaggard. The work describes a factory-based process in which captured CO₂ is chemically reacted with alkaline calcium- or magnesium-bearing feedstocks (including industrial residues or silicate minerals) to form stable carbonate minerals (e.g., CaCO₃ and MgCO₃). These minerals are shaped into granular aggregate pellets suitable for non-structural construction and landscaping applications, such as concrete flatwork, paving, drainage layers, and decorative fill. By relocating mineral carbonation from in-situ geological storage or in-concrete reactions into a controlled industrial process, the concept emphasizes irreversible carbon disposal, verifiable mass balance, and integration into existing materials supply chains. Once mineralized, the carbon is permanently locked in solid form, eliminating leakage pathways and long-term monitoring requirements associated with gaseous or biological carbon storage. The paper outlines: The chemical basis of carbonate mineralization Conceptual manufacturing pathways and reactor flexibility Feedstock and CO₂ source diversity Material properties and end-use contexts Scalability considerations and potential carbon impact Energy and emissions boundaries Limitations, non-claims, and deployment constraints This disclosure is intentionally non-proprietary and released as public prior art to prevent enclosure of the described technological space and to encourage independent implementation, adaptation, and improvement by industry, governments, researchers, and infrastructure developers worldwide. The author encourages use of this work to support net-zero strategies, industrial decarbonization, and permanent carbon removal pathways, particularly in hard-to-abate sectors where durable material integration offers advantages over temporary storage solutions. This record is provided for research, reference, and climate-mitigation acceleration purposes and does not constitute a commercial offer, performance guarantee, or regulatory approval.