{"title":"New insights into the retardation mechanism of phosphorus slag on the early cement hydration","authors":"Shiyu Zhuang , Qiang Wang , Yichen Shan , Ruiquan Jia , Zihan Zhou","doi":"10.1016/j.cemconcomp.2025.105963","DOIUrl":null,"url":null,"abstract":"<div><div>Phosphorus slag (PS) is widely reported to retard the cement hydration due to the existence of phosphorus and fluorine in it. However, the key role and its corresponding mechanism have not been fully reported. In this study, the effects of PS on the early cement hydration were investigated from the insights of solid phases, aqueous species and microstructures evolution. Results show that PS remarkably prolongs the induction period and setting time, and delays the microstructure evolution of cement paste. PS retards the early hydration of C<sub>3</sub>S, inhibiting the precipitation of C-S-H and portlandite, but promotes the hydration of C<sub>3</sub>A. It is likely that the insoluble phosphorus-fluorine compound in PS plays a more important role in the retardation. The doping of calcium or silicon in the phosphorus-fluorine compound can restrict its retarding effect on the early cement hydration.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"158 ","pages":"Article 105963"},"PeriodicalIF":10.8000,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cement & concrete composites","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0958946525000459","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
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Abstract
Phosphorus slag (PS) is widely reported to retard the cement hydration due to the existence of phosphorus and fluorine in it. However, the key role and its corresponding mechanism have not been fully reported. In this study, the effects of PS on the early cement hydration were investigated from the insights of solid phases, aqueous species and microstructures evolution. Results show that PS remarkably prolongs the induction period and setting time, and delays the microstructure evolution of cement paste. PS retards the early hydration of C3S, inhibiting the precipitation of C-S-H and portlandite, but promotes the hydration of C3A. It is likely that the insoluble phosphorus-fluorine compound in PS plays a more important role in the retardation. The doping of calcium or silicon in the phosphorus-fluorine compound can restrict its retarding effect on the early cement hydration.
期刊介绍：
Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.
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