Jaworska Beata, Stańczak Dominika, Kobyłka Rafał, Gołofit Tomasz, Zhang Duo, Kuziak Justyna
Faculty of Civil Engineering, Warsaw University of Technology, Armii Ludowej 16, 00-637 Warsaw, Poland.
Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland.
Materials (Basel). 2025 May 9;18(10):2181. doi: 10.3390/ma18102181.
To address the challenge of reducing carbon dioxide emissions, this study focuses on carbon dioxide sequestration in calcareous fly ash and its use in mortar and concrete specimens, including reinforced structures. Calcareous fly ash was used in this study because it contains more reactive Ca phases, enabling efficient CO capture and long-term storage through mineral carbonation. The research examines the influence of incorporating carbonated fly ash on the protective properties of the concrete cover for steel reinforcement, along with an analysis of the mechanical behavior of the specimens, resistance to weathering carbonation, and the modeling of the service life of reinforced concrete structures. The results indicate that the compressive strength of concrete specimens decreases with the addition of carbonated ash, though by no more than 9% after 90 days. The carbonation rate of concrete increases with the addition of ash; however, a roughly 4% lower rate was observed for carbonated ash compared to non-carbonated ash. No significant impact of ash carbonation on chloride diffusion or the corrosion process of reinforcement in mortars was detected. As a result, the estimated service life of concrete containing both ash and carbonated ash is over 20 times longer than that of the reference concrete.
为应对减少二氧化碳排放的挑战，本研究聚焦于钙质粉煤灰中的二氧化碳封存及其在砂浆和混凝土试件（包括钢筋结构）中的应用。本研究采用钙质粉煤灰是因为其含有更多活性钙相，能够通过矿物碳酸化实现高效的二氧化碳捕获和长期储存。该研究考察了掺入碳酸化粉煤灰对钢筋混凝土保护层防护性能的影响，同时分析了试件的力学性能、耐风化碳化性能以及钢筋混凝土结构使用寿命的建模。结果表明，混凝土试件的抗压强度随碳酸化灰的添加而降低，但90天后降幅不超过9%。混凝土的碳化速率随灰的添加而增加；然而，与未碳酸化灰相比，碳酸化灰的碳化速率大约低4%。未检测到灰的碳酸化对砂浆中氯离子扩散或钢筋腐蚀过程有显著影响。因此，含灰和碳酸化灰的混凝土的估计使用寿命比参考混凝土长20倍以上。
