Effect of fly ash on hydration and carbonation of carbonation-cured Portland cements

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization Pub Date : 2024-10-01 DOI:10.1016/j.jcou.2024.102943

Geta Bekalu Belayneh , Naru Kim , Joonho Seo , Hansun Kim , Seunghee Park , H.M. Son , Solmoi Park

{"title":"Effect of fly ash on hydration and carbonation of carbonation-cured Portland cements","authors":"Geta Bekalu Belayneh , Naru Kim , Joonho Seo , Hansun Kim , Seunghee Park , H.M. Son , Solmoi Park","doi":"10.1016/j.jcou.2024.102943","DOIUrl":null,"url":null,"abstract":"<div><div>This study investigates the impact of fly ash on hydration and carbonation processes in carbonation-cured fly ash cements. Cement paste samples with fly ash replacement levels of 0 %, 5 %, 10 % and 30 % underwent carbonation curing for 28 days. Results reveal that the CaO content does not affect the final CO<sub>2</sub> absorption capacity. Instead, optimal fly ash replacement of 10 % enhances CO<sub>2</sub> uptake, yielding 52.9 g of CaCO<sub>3</sub> on the surface after 28 days of curing, compared to 43.4, 43.1 and 48.4 g for 0 %, 5 % and 30 % replaced samples, respectively. Additionally, fly ash incorporation significantly enhances belite reaction and improved CO<sub>2</sub> binding capacity. However, the reaction extent of alite was lower when exposed to CO<sub>2</sub>-curing conditions. These findings advance understanding of blended cements in carbonation-curing, facilitating the development of environmentally friendly and durable concrete structures.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"88 ","pages":"Article 102943"},"PeriodicalIF":7.2000,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of CO2 Utilization","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2212982024002786","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

This study investigates the impact of fly ash on hydration and carbonation processes in carbonation-cured fly ash cements. Cement paste samples with fly ash replacement levels of 0 %, 5 %, 10 % and 30 % underwent carbonation curing for 28 days. Results reveal that the CaO content does not affect the final CO₂ absorption capacity. Instead, optimal fly ash replacement of 10 % enhances CO₂ uptake, yielding 52.9 g of CaCO₃ on the surface after 28 days of curing, compared to 43.4, 43.1 and 48.4 g for 0 %, 5 % and 30 % replaced samples, respectively. Additionally, fly ash incorporation significantly enhances belite reaction and improved CO₂ binding capacity. However, the reaction extent of alite was lower when exposed to CO₂-curing conditions. These findings advance understanding of blended cements in carbonation-curing, facilitating the development of environmentally friendly and durable concrete structures.

查看原文本刊更多论文

粉煤灰对碳化固化硅酸盐水泥水化和碳化的影响

本研究探讨了粉煤灰对碳化固化粉煤灰水泥水化和碳化过程的影响。粉煤灰掺量分别为 0%、5%、10% 和 30% 的水泥浆样品经过 28 天的碳化固化。结果表明，氧化钙含量不会影响最终的二氧化碳吸收能力。相反，粉煤灰的最佳替代率为 10%，可提高二氧化碳吸收能力，固化 28 天后，表面产生 52.9 克 CaCO3，而替代率为 0%、5% 和 30%的样品分别为 43.4 克、43.1 克和 48.4 克。此外，粉煤灰的加入还能显著增强白云石反应，提高二氧化碳结合能力。然而，在二氧化碳固化条件下，白云石的反应程度较低。这些发现加深了人们对碳化固化过程中混合水泥的理解，有助于开发环保耐用的混凝土结构。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL

CiteScore

13.90

自引率

10.40%

发文量

406

审稿时长

2.8 months

期刊介绍： The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.