Effects of CO(2) Concentration and the Uptake on Carbonation of Cement-Based Materials.
Effects of CO(2) Concentration and the Uptake on Carbonation of Cement-Based Materials.
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CO2 浓度和吸收量对水泥基材料碳化的影响
DOI：
10.3390/ma15186445
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发表时间：
2022-09-16
期刊：
影响因子：
--
通讯作者：
Li C
中科院分区：
文献类型：
--
作者：
Yu Q;Guo B;Li C
碳化严重恶化了既有钢筋混凝土结构的耐久性。在这项研究中，一个热力学模型被用来研究水泥基材料的碳化反应。探讨了CO2浓度和掺量对砂浆碳化行为的影响。模拟结果表明，水泥基材料在不同CO2浓度下的碳化反应机理可能不同。几乎所有的水合物相都具有相应的CO2浓度阈值，高于该阈值可以触发相应的碳酸化反应。不同Ca/Si比的C-S-H相的阈值不同。计算结果还表明，完全空气碳化后水泥浆体中的相组合主要由低Ca/Si比的C-S-H、钙铝石、CaCO 3和CaSO 4组成。当高Ca/Si比的C-S-H相完全脱钙成低Ca/Si比的C-S-H相时，通过增加CO2吸收，孔溶液的pH表现出显著降低。此外，实验结果和以前发表的调查被用来验证模拟结果。
Carbonation seriously deteriorates the durability of existing reinforced concrete structures. In this study, a thermodynamic model is used to investigate the carbonation reactions in cement-based materials. The effects of the concentration and amounts of CO2 on the carbonation behaviors of mortar are discussed. The simulation results show that the mechanisms of the carbonation reaction of cement-based materials at different CO2 concentrations may be different. Nearly all of the hydrate phases have a corresponding CO2 concentration threshold, above which the corresponding carbonation reaction can be triggered. The thresholds of the C-S-H phases with different Ca/Si ratios are different. The calculation results also show that the phase assemblages in cement paste after being completely air-carbonated, primarily consist of a low-Ca/Si ratio C-S-H, strätlingite, CaCO3 and CaSO4. The pH of the pore solution exhibits a significant decrease when a higher Ca/Si ratio C-S-H phase is completely decalcified into a lower Ca/Si ratio C-S-H phase, by increasing the CO2 uptake. Additionally, the experimental results and the previously published investigations are used to validate the simulation results.
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影响因子：
11.4
作者：
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