Effect of pre-hydration age on phase assemblage, microstructure and compressive strength of CO2 cured cement mortar
Effect of pre-hydration age on phase assemblage, microstructure and compressive strength of CO2 cured cement mortar
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DOI：
10.1016/j.conbuildmat.2022.126760
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发表时间：
2022-03
影响因子：
7.4
通讯作者：
Kaiwang Xue;C. Wan;Y. Xu;Yuping Jiang;Y. Cheng
中科院分区：
文献类型：
--
作者：
Kaiwang Xue;C. Wan;Y. Xu;Yuping Jiang;Y. Cheng
本研究研究了预水化龄期对二氧化碳固化水泥砂浆的相组合、微观结构和强度发展的影响。结果表明，CO2 固化加速了熟料相的反应，尤其是在早期阶段。此外，CO2固化促进了CaCO3的形成，尤其是分解模式II中CaCO3的形成。随着预水化时间的延长，分解模式I的含量和CaCO3总含量增加。方解石是主要晶相，未发现文石。与对照相比，预水化水泥砂浆的孔结构参数和孔隙连通性均得到改善，特别是预水化6 h的样品；抗压强度明显增加，尤其是在幼年时期。然而，28 d 抗压强度并没有随着预水化时间的延长而持续增加。
This study investigated the effect of pre-hydration age on phase assemblages, microstructure, and strength development of CO2cured cement mortars. The results indicated that CO2curing accelerated the reaction of clinker phases, especially at early age. In addition, CO2curing promoted the formation of CaCO3, especially the CaCO3in decomposition mode II. The content in decomposition mode I and the total content of CaCO3increased with pre-hydration duration. Calcite was the main crystalline phase, and no aragonite was found. Compared with the reference, the pore structure parameters and pore connectivity of cement mortars with pre-hydration were improved, especially the sample with pre-hydration for 6 h; and the compressive strength was obviously increased, especially at early age. However, the 28 d compressive strength did not increase continuously with the pre-hydration duration.