Simon Judes Sujatha, Victor Rajasekaran Ruban Daniel, Thanga Jebarsan, Anandakumar Daisy Sheena
{"title":"碱活化粉煤灰中铝硅酸盐凝胶的形成:核磁共振光谱研究","authors":"Simon Judes Sujatha, Victor Rajasekaran Ruban Daniel, Thanga Jebarsan, Anandakumar Daisy Sheena","doi":"10.3103/S1068364X25600198","DOIUrl":null,"url":null,"abstract":"<p>This study investigates the impact of a CO<sub>2</sub>-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 CO<sub>2</sub> concentration. Highly reactive elements such as Na and Al fully reacted within the initial hours and remained unaffected by carbonation under high CO<sub>2</sub> 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 CO<sub>2</sub> exposure, leading to an increased gel content in the carbonated sample. These findings enhance the understanding of aluminosilicate gel chemistry and behavior under elevated CO<sub>2</sub> concentrations, providing insights into the long-term performance of alkali-activated materials in carbon-rich environments.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 3","pages":"313 - 320"},"PeriodicalIF":0.5000,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Aluminosilicate Gel Formation in Alkali-Activated Fly Ash: An NMR Spectroscopic Study\",\"authors\":\"Simon Judes Sujatha, Victor Rajasekaran Ruban Daniel, Thanga Jebarsan, Anandakumar Daisy Sheena\",\"doi\":\"10.3103/S1068364X25600198\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>This study investigates the impact of a CO<sub>2</sub>-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 CO<sub>2</sub> concentration. Highly reactive elements such as Na and Al fully reacted within the initial hours and remained unaffected by carbonation under high CO<sub>2</sub> 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 CO<sub>2</sub> exposure, leading to an increased gel content in the carbonated sample. These findings enhance the understanding of aluminosilicate gel chemistry and behavior under elevated CO<sub>2</sub> concentrations, providing insights into the long-term performance of alkali-activated materials in carbon-rich environments.</p>\",\"PeriodicalId\":519,\"journal\":{\"name\":\"Coke and Chemistry\",\"volume\":\"68 3\",\"pages\":\"313 - 320\"},\"PeriodicalIF\":0.5000,\"publicationDate\":\"2025-07-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Coke and Chemistry\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://link.springer.com/article/10.3103/S1068364X25600198\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Coke and Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.3103/S1068364X25600198","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
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.
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.