碱活化粉煤灰中铝硅酸盐凝胶的形成:核磁共振光谱研究

IF 0.5 Q4 ENGINEERING, CHEMICAL
Simon Judes Sujatha, Victor Rajasekaran Ruban Daniel, Thanga Jebarsan, Anandakumar Daisy Sheena
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引用次数: 0

摘要

利用核磁共振技术研究了富co2环境对碱活性粉煤灰(AAAFA)中铝硅酸盐凝胶的影响。在80℃下固化24 h后,将AAAFA样品暴露于10%的环境CO2浓度中。高活性元素如Na和Al在最初的几个小时内完全反应,并且在高二氧化碳水平下不受碳酸化的影响。然而,反应较慢的Si表现出不同的行为。尽管碳酸化样品的总体反应程度较低,但单体硅酸盐的聚合速度很快。这表明由于强烈的二氧化碳暴露形成了结合凝胶相,导致碳化样品中的凝胶含量增加。这些发现增强了对高CO2浓度下铝硅酸盐凝胶化学和行为的理解,为碱活化材料在富碳环境中的长期性能提供了见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Aluminosilicate Gel Formation in Alkali-Activated Fly Ash: An NMR Spectroscopic Study

Aluminosilicate Gel Formation in Alkali-Activated Fly Ash: An NMR Spectroscopic Study

This study investigates the impact of a CO2-rich environment on the aluminosilicate gel in alkali-activated fly ash (AAAFA) using NMR spectroscopy. After 24 h of curing at 80°C, the AAAFA samples were exposed to a 10% ambient CO2 concentration. Highly reactive elements such as Na and Al fully reacted within the initial hours and remained unaffected by carbonation under high CO2 levels. However, Si, which reacts more slowly, exhibited distinct behaviour. Monomeric silicates rapidly polymerized despite the carbonated sample showing a lower overall reaction extent. This indicates the formation of a binding gel phase due to intense CO2 exposure, leading to an increased gel content in the carbonated sample. These findings enhance the understanding of aluminosilicate gel chemistry and behavior under elevated CO2 concentrations, providing insights into the long-term performance of alkali-activated materials in carbon-rich environments.

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来源期刊
Coke and Chemistry
Coke and Chemistry ENGINEERING, CHEMICAL-
CiteScore
0.70
自引率
50.00%
发文量
36
期刊介绍: The journal publishes scientific developments and applications in the field of coal beneficiation and preparation for coking, coking processes, design of coking ovens and equipment, by-product recovery, automation of technological processes, ecology and economics. It also presents indispensable information on the scientific events devoted to thermal rectification, use of smokeless coal as an energy source, and manufacture of different liquid and solid chemical products.
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