{"title":"Dual dynamic regulation mechanism of trace calcium phosphate on hydration of cementitious materials and optimization of pore structure","authors":"Lei Wu , Jin Zhong , Zhe Sun , Yan Cao","doi":"10.1016/j.cemconres.2025.107875","DOIUrl":null,"url":null,"abstract":"<div><div>This study explores the regulatory mechanisms of trace calcium phosphate (CaP) in the hydration of Portland cement. The results indicate that incorporating 0.001 wt% CaP extends the induction period by forming a passivation film while simultaneously accelerating the hydration rate during the acceleration phase as a nucleation agent, thereby improving hydration efficiency and uniformity. CaP enhances the polymerization degree and homogeneity of C-S-H gel. It modulates the formation and distribution of Ca(OH)₂, facilitating a controlled transition of the crystal structure from a chain-like configuration to layered or network-like forms, thereby enhancing stability. Furthermore, this study highlights the distinct roles of CaP in fresh and aged cement systems and proposes a multi-scale mechanism for complex hydration processes. These findings offer valuable theoretical insights and practical guidance for applying CaP in cementitious materials.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"193 ","pages":"Article 107875"},"PeriodicalIF":10.9000,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cement and Concrete Research","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0008884625000948","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}
引用次数: 0
Abstract
This study explores the regulatory mechanisms of trace calcium phosphate (CaP) in the hydration of Portland cement. The results indicate that incorporating 0.001 wt% CaP extends the induction period by forming a passivation film while simultaneously accelerating the hydration rate during the acceleration phase as a nucleation agent, thereby improving hydration efficiency and uniformity. CaP enhances the polymerization degree and homogeneity of C-S-H gel. It modulates the formation and distribution of Ca(OH)₂, facilitating a controlled transition of the crystal structure from a chain-like configuration to layered or network-like forms, thereby enhancing stability. Furthermore, this study highlights the distinct roles of CaP in fresh and aged cement systems and proposes a multi-scale mechanism for complex hydration processes. These findings offer valuable theoretical insights and practical guidance for applying CaP in cementitious materials.
期刊介绍:
Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.