Amino acids as performance-controlling additives in carbonation-activated cementitious materials
Amino acids as performance-controlling additives in carbonation-activated cementitious materials
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DOI：
10.1016/j.cemconres.2021.106501
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发表时间：
2021-06-15
影响因子：
11.4
通讯作者：
Olek, Jan
中科院分区：
文献类型：
--
作者：
Khan, Rakibul I.;Ashraf, Warda;Olek, Jan
本文研究了氨基酸对碳酸化固化硅灰石复合材料中碳酸钙结晶的控制作用。据观察，硅灰石碳酸化没有任何氨基酸形成方解石作为碳酸钙的主要多晶型物。相比之下，使用氨基酸作为外加剂导致在硅灰石的碳酸化过程中形成稳定的无定形碳酸钙（ACC）、球文石和文石。与对照批次相比，观察到用氨基酸生产的碳酸化复合材料具有较低的临界孔径，但总孔隙率较高。此外，观察到氨基酸的利用使复合材料的弯曲强度和压缩强度分别增加至106%和48%，与对照批次相比。这种性能增强的碳酸化复合材料中的氨基酸的存在下，归因于降低的临界孔径和在基体中的有机-无机杂化相的形成。
This article presents an investigation on the application of amino acids to control the CaCO3 crystallization in carbonation cured wollastonite composites. It was observed that wollastonite carbonated without any amino acid formed calcite as the primary polymorph of CaCO3. In contrast, the use of amino acids as admixtures resulted in the formation of stable amorphous calcium carbonate (ACC), vaterite, and aragonite during the carbonation of wollastonite. The carbonated composites produced with amino acids were observed to have a lower critical pore size, but a higher total porosity, compared to the control batch. Additionally, the utilization of amino acids was observed to increase the flexural strength and compressive strength of the composites up to 106% and 48%, respectively, compared to the control batch. Such performance enhancement of the carbonated composites in the presence of amino acids was attributed to the reduced critical pore size and the formation of organic-inorganic hybrid phases in the matrix.