{"title":"石灰中和废水对碱活性矿渣/粉煤灰砂浆性能的影响","authors":"Tao Zhou, Jin Li","doi":"10.1617/s11527-024-02494-9","DOIUrl":null,"url":null,"abstract":"<div><p>This paper was conducted to upcycle lime-neutralize etching wastewater (LNW), produced from the etching of cenospheres for producing perforated cenospheres, into alkali-activated slag/fly ash, considering the high contents of Ca<sup>2+</sup> (Calcium ion), Cl<sup>−</sup> (Chloride ion), and OH<sup>−</sup> (Hydroxyl). The aim of this study is to limit the discharge of calcium-rich wastewater and minimize the pollution of water and soil resources. To this end, the effects of different LNW content on the fresh properties, hydration products, compressive strength, microstructure and nanomechanical properties of AASF were investigated. Results revealed that the addition of LNW extended the setting times and inhibited the early hydration of AASF due to the existence of Ca<sup>2+</sup> and NH<sup>4+</sup> (Ammonium) in LNW. In addition, the existence of Ca<sup>2+</sup> in LNW reacts with NaOH to form Ca(OH)<sub>2</sub>, which can work as an auxiliary activator for AASF. Consequently, the LNW-added AASF mortars exhibited denser pore structures and higher compressive strengths. By using 25–100% LNW, the compressive strengths of AASF mortars can be improved by 2.7–18.9% (3d), 4.8–19.5% (7d) and 5.6–19.7% (28d), respectively.</p></div>","PeriodicalId":691,"journal":{"name":"Materials and Structures","volume":"57 9","pages":""},"PeriodicalIF":3.4000,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of lime neutralization wastewater on the performance of alkali-activated slag/fly ash mortars\",\"authors\":\"Tao Zhou, Jin Li\",\"doi\":\"10.1617/s11527-024-02494-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>This paper was conducted to upcycle lime-neutralize etching wastewater (LNW), produced from the etching of cenospheres for producing perforated cenospheres, into alkali-activated slag/fly ash, considering the high contents of Ca<sup>2+</sup> (Calcium ion), Cl<sup>−</sup> (Chloride ion), and OH<sup>−</sup> (Hydroxyl). The aim of this study is to limit the discharge of calcium-rich wastewater and minimize the pollution of water and soil resources. To this end, the effects of different LNW content on the fresh properties, hydration products, compressive strength, microstructure and nanomechanical properties of AASF were investigated. Results revealed that the addition of LNW extended the setting times and inhibited the early hydration of AASF due to the existence of Ca<sup>2+</sup> and NH<sup>4+</sup> (Ammonium) in LNW. In addition, the existence of Ca<sup>2+</sup> in LNW reacts with NaOH to form Ca(OH)<sub>2</sub>, which can work as an auxiliary activator for AASF. Consequently, the LNW-added AASF mortars exhibited denser pore structures and higher compressive strengths. By using 25–100% LNW, the compressive strengths of AASF mortars can be improved by 2.7–18.9% (3d), 4.8–19.5% (7d) and 5.6–19.7% (28d), respectively.</p></div>\",\"PeriodicalId\":691,\"journal\":{\"name\":\"Materials and Structures\",\"volume\":\"57 9\",\"pages\":\"\"},\"PeriodicalIF\":3.4000,\"publicationDate\":\"2024-10-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Materials and Structures\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1617/s11527-024-02494-9\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CONSTRUCTION & BUILDING TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials and Structures","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1617/s11527-024-02494-9","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
Effect of lime neutralization wastewater on the performance of alkali-activated slag/fly ash mortars
This paper was conducted to upcycle lime-neutralize etching wastewater (LNW), produced from the etching of cenospheres for producing perforated cenospheres, into alkali-activated slag/fly ash, considering the high contents of Ca2+ (Calcium ion), Cl− (Chloride ion), and OH− (Hydroxyl). The aim of this study is to limit the discharge of calcium-rich wastewater and minimize the pollution of water and soil resources. To this end, the effects of different LNW content on the fresh properties, hydration products, compressive strength, microstructure and nanomechanical properties of AASF were investigated. Results revealed that the addition of LNW extended the setting times and inhibited the early hydration of AASF due to the existence of Ca2+ and NH4+ (Ammonium) in LNW. In addition, the existence of Ca2+ in LNW reacts with NaOH to form Ca(OH)2, which can work as an auxiliary activator for AASF. Consequently, the LNW-added AASF mortars exhibited denser pore structures and higher compressive strengths. By using 25–100% LNW, the compressive strengths of AASF mortars can be improved by 2.7–18.9% (3d), 4.8–19.5% (7d) and 5.6–19.7% (28d), respectively.
期刊介绍：
Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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