{"title":"Carbonated waste paste calcined clay cement with enhanced CO2 mineralization and early strength","authors":"Qing Liu, Yu Yan, Yuchen Hu, Qiang You, Guoqing Geng","doi":"10.1016/j.ccst.2024.100343","DOIUrl":null,"url":null,"abstract":"<div><div>Modern concrete offers a significant potential for carbon capture, utilization and storage due to their alkaline nature. Herein, we combine the CO<sub>2</sub> mineralization in the waste cement paste (WCP) with calcined clay cement to develop a novel low-carbon cement—carbonated waste paste calcined clay cement (CWPC<sup>3</sup>). Our results suggest that 1 kg WCP efficiently mineralizes ∼0.27 kg CO<sub>2</sub> within 2 h, and together produces amorphous silica-alumina gel. This carbonated WCP promotes early hydration and strength development due to its high pozzolanic reactivity. Compared with conventional limestone calcined clay cement (LC<sup>3</sup>), CWPC<sup>3</sup> has higher early strength and lower embodied carbon. Our work provides a synchronized solution to treat WCP while reducing embodied carbon in construction materials.</div></div>","PeriodicalId":9387,"journal":{"name":"Carbon Capture Science & Technology","volume":"14 ","pages":"Article 100343"},"PeriodicalIF":0.0000,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Carbon Capture Science & Technology","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2772656824001556","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Modern concrete offers a significant potential for carbon capture, utilization and storage due to their alkaline nature. Herein, we combine the CO2 mineralization in the waste cement paste (WCP) with calcined clay cement to develop a novel low-carbon cement—carbonated waste paste calcined clay cement (CWPC3). Our results suggest that 1 kg WCP efficiently mineralizes ∼0.27 kg CO2 within 2 h, and together produces amorphous silica-alumina gel. This carbonated WCP promotes early hydration and strength development due to its high pozzolanic reactivity. Compared with conventional limestone calcined clay cement (LC3), CWPC3 has higher early strength and lower embodied carbon. Our work provides a synchronized solution to treat WCP while reducing embodied carbon in construction materials.
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