This research brief led by Drs. Pranav Pradeep Kumar and Hessam AzariJafari examines how the quantity of atmospheric carbon dioxide sequestered by crushed concrete is affected by the size distribution of aggregate particles (grading) and their paste content. The brief finds that fine particles of crushed concrete exhibit an approximately 270% higher paste content and 36% higher degree of carbonation than coarser particles. The CSHub model finds 33% higher uptake than existing models applied to the same representative sample, underscoring the importance of incorporating grading variability into end-of-life (EOL) carbon uptake assessments while more accurately capturing paste content variability.
