Maximizing CO2 sequestration in cement-bonded fiberboards through carbonation curing

CO2 sequestration in cement-bonded cellulose fiberboards through carbonation curing was studied. The maximum possible carbon dioxide uptake by ordinary Portland cement within a curing process was determined by a cement solution carbonation. It was 28.5% based on cement mass after 18 h initial hydration and 24 h carbonation. The best combination of material and process parameters in fiberboard carbonation had facilitated a curing process to allow 24.4% carbon uptake in 8 h carbonation and 20% carbon uptake in 0.5 h carbonation, a 70-85% reaction efficiency within 24 h. It was found that the CO2 sequestration was dependent on the water content in fiberboards after preconditioning. An optimal water content was ranged from 40 to 60%. Carbonated fiberboards had shown a flexural strength at least 70% of ultimate strength within 24 h and a much improved freeze-thaw and wet-dry durability performance. If all cement-bonded cellulose fiberboards in United States adopt carbonation production, the annual CO2 consumption by fiberboards can reach 0.36 Mt. (C) 2019 Elsevier Ltd. All rights reserved.