{"title":"通过碳化高剂量 Ca(OH)2 + 矿渣 + NaHCO3 (HCHSN) 水泥浆形成 CaCO3 基粘结剂","authors":"Yilin Zhao, Zanqun Liu, Jiahui Zhu, Yu Cui, Babar Iqbal","doi":"10.1016/j.jcou.2024.102967","DOIUrl":null,"url":null,"abstract":"<div><div>Normally, carbonation can cause the decalcification of C-(A)-S-H gel of alkali-activated cement and the degradation of mechanical properties. While, we propose another possibility to form CaCO<sub>3</sub>-based binder by carbonating the alkali-activated slag cement of high-dosage Ca(OH)<sub>2</sub> (30 %) + slag (70 %) + NaHCO<sub>3</sub> (5.11 % by weight of Ca(OH)<sub>2</sub> and slag) (HCHSN) in this study. The results supported that the compressive strength and volume stability of HCHSN cement paste can be improved by the carbonation curing and the carbonated HCHSN cement paste could reach a maximum compressive strength of 32.4 MPa. According to the micro-analysis of XRD, TGA, FTIR, <sup>1</sup>H NMR, BSE and SEM, the carbonated HCHSN cement paste was developed into a CaCO<sub>3</sub>-based binder with a CaCO<sub>3</sub> content approaching 60 % (based on the mass of the samples heated to 800℃). NaHCO<sub>3</sub> played a key role in the formation of the CaCO<sub>3</sub>-based binder, which not only accelerated the carbonation rate, but also promoted the carbonation of slag. The eco-efficiency assessment showed that compared to the production of 12.5 kg CO<sub>2</sub> /MPa/t from carbonated ordinary Portland cement, the carbonated HCHSN cement paste only produced 3.5 kg CO<sub>2</sub> /MPa/t, making it a very green CaCO<sub>3</sub>-based cementitious materials.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"89 ","pages":"Article 102967"},"PeriodicalIF":7.2000,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The formation of CaCO3-based binder by carbonating high-dosage Ca(OH)2 + slag + NaHCO3 (HCHSN) cement paste\",\"authors\":\"Yilin Zhao, Zanqun Liu, Jiahui Zhu, Yu Cui, Babar Iqbal\",\"doi\":\"10.1016/j.jcou.2024.102967\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Normally, carbonation can cause the decalcification of C-(A)-S-H gel of alkali-activated cement and the degradation of mechanical properties. While, we propose another possibility to form CaCO<sub>3</sub>-based binder by carbonating the alkali-activated slag cement of high-dosage Ca(OH)<sub>2</sub> (30 %) + slag (70 %) + NaHCO<sub>3</sub> (5.11 % by weight of Ca(OH)<sub>2</sub> and slag) (HCHSN) in this study. The results supported that the compressive strength and volume stability of HCHSN cement paste can be improved by the carbonation curing and the carbonated HCHSN cement paste could reach a maximum compressive strength of 32.4 MPa. According to the micro-analysis of XRD, TGA, FTIR, <sup>1</sup>H NMR, BSE and SEM, the carbonated HCHSN cement paste was developed into a CaCO<sub>3</sub>-based binder with a CaCO<sub>3</sub> content approaching 60 % (based on the mass of the samples heated to 800℃). NaHCO<sub>3</sub> played a key role in the formation of the CaCO<sub>3</sub>-based binder, which not only accelerated the carbonation rate, but also promoted the carbonation of slag. The eco-efficiency assessment showed that compared to the production of 12.5 kg CO<sub>2</sub> /MPa/t from carbonated ordinary Portland cement, the carbonated HCHSN cement paste only produced 3.5 kg CO<sub>2</sub> /MPa/t, making it a very green CaCO<sub>3</sub>-based cementitious materials.</div></div>\",\"PeriodicalId\":350,\"journal\":{\"name\":\"Journal of CO2 Utilization\",\"volume\":\"89 \",\"pages\":\"Article 102967\"},\"PeriodicalIF\":7.2000,\"publicationDate\":\"2024-10-26\",\"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/S2212982024003020\",\"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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of CO2 Utilization","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2212982024003020","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}
The formation of CaCO3-based binder by carbonating high-dosage Ca(OH)2 + slag + NaHCO3 (HCHSN) cement paste
Normally, carbonation can cause the decalcification of C-(A)-S-H gel of alkali-activated cement and the degradation of mechanical properties. While, we propose another possibility to form CaCO3-based binder by carbonating the alkali-activated slag cement of high-dosage Ca(OH)2 (30 %) + slag (70 %) + NaHCO3 (5.11 % by weight of Ca(OH)2 and slag) (HCHSN) in this study. The results supported that the compressive strength and volume stability of HCHSN cement paste can be improved by the carbonation curing and the carbonated HCHSN cement paste could reach a maximum compressive strength of 32.4 MPa. According to the micro-analysis of XRD, TGA, FTIR, 1H NMR, BSE and SEM, the carbonated HCHSN cement paste was developed into a CaCO3-based binder with a CaCO3 content approaching 60 % (based on the mass of the samples heated to 800℃). NaHCO3 played a key role in the formation of the CaCO3-based binder, which not only accelerated the carbonation rate, but also promoted the carbonation of slag. The eco-efficiency assessment showed that compared to the production of 12.5 kg CO2 /MPa/t from carbonated ordinary Portland cement, the carbonated HCHSN cement paste only produced 3.5 kg CO2 /MPa/t, making it a very green CaCO3-based cementitious materials.
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.
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