Experimental studies and thermodynamic modeling of the carbonation of Portland cement, metakaolin and limestone mortars
Experimental studies and thermodynamic modeling of the carbonation of Portland cement, metakaolin and limestone mortars
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DOI：
10.1016/j.cemconres.2016.06.006
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发表时间：
2016-10-01
影响因子：
11.4
通讯作者：
Skibsted, Jorgen
中科院分区：
文献类型：
--
作者：
Shi, Zhenguo;Lothenbach, Barbara;Skibsted, Jorgen
研究了波特兰水泥、偏高岭土和石灰石砂浆在20 ℃/57%RH下水合91天并暴露于1%（v/v）CO2 280天后的碳酸化。碳酸化深度已被测量的酚酞，而压汞法（MIP），热重分析和热力学模型已被用来研究孔结构，CO2结合能力和相组合。波特兰水泥由于其最高的CO2结合能力而具有最高的抗碳酸化性。石灰石共混物比偏高岭土共混物具有更高的CO2结合能力，而偏高岭土共混物的更好的抗碳酸化性与其更细的孔结构和更低的总孔隙率有关，因为更细的孔有利于毛细凝聚。MIP显示了所有砂浆碳化后的孔隙阈值变粗。总的来说，CO2结合能力，孔隙度和毛细凝聚被认为是决定性的参数控制的碳酸化速率。(C)2016爱思唯尔有限公司版权所有。
The carbonation of Portland cement, metakaolin and limestone mortars has been investigated after hydration for 91 days and exposure to 1% (v/v) CO2 at 20 degrees C/57% RH for 280 days. The carbonation depths have been measured by phenolphthalein whereas mercury intrusion porosimetry (MIP), TGA and thermodynamic modeling have been used to study pore structure, CO2 binding capacity and phase assemblages. The Portland cement has the highest resistance to carbonation due to its highest CO2 binding capacity. The limestone blend has higher CO2 binding capacity than the metakaolin blends, whereas the better carbonation resistance of the metakaolin blends is related to their finer pore structure and lower total porosity, since the finer pores favor capillary condensation. MIP shows a coarsening of the pore threshold upon carbonation for all mortars. Overall, the CO2 binding capacity, porosity and capillary condensation are found to be the decisive parameters governing the carbonation rate. (C) 2016 Elsevier Ltd. All rights reserved.