Effect of ground granulated blast furnace slag on hydration characteristics of ferrite-rich calcium sulfoaluminate cement in seawater  

海水环境下矿渣对高铁硫铝酸盐水泥水化特性的影响

作　　者：CHEN Jia-wen LIAO Yi-shun MA Feng TANG Sheng-wen 陈佳文;廖宜顺;马丰;汤盛文(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Hubei Provincial Engineering Research Center of Urban Regeneration,Wuhan 430065,China;Institute of High Performance Engineering Structure,Wuhan University of Science and Technology,Wuhan 430065,China;State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,China)

机构地区：[1]School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China [2]Hubei Provincial Engineering Research Center of Urban Regeneration,Wuhan 430065,China [3]Institute of High Performance Engineering Structure,Wuhan University of Science and Technology,Wuhan 430065,China [4]State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,China

出　　处：《Journal of Central South University》2025年第1期189-204,共16页中南大学学报(英文版)

基　　金：Project(2023DJC182)supported by the Department of Science and Technology of Hubei Province,China;Projects(51608402,51602229)supported by the National Natural Science Foundation of China;Project(2021-2075-38)supported by the Department of Housing and Urban-Rural Development of Hubei Province,China。

摘　　要：Ferrite-rich calcium sulfoaluminate(FCSA)cement is often used in special projects such as marine engineering due to its excellent resistance of seawater attack although the cost is a little high.Ground granulated blast furnace slag(GGBS),a byproduct of industrial production,is used as a mineral admixture to reduce concrete costs and provide excellent performance.This study aimed to investigate the impact of GGBS on the hydration properties of FCSA cement in seawater.Tests were conducted on heat of hydration,compressive strength,mass change,and pH value of pore solution of FCSA cement paste with a water-to-binder ratio of 0.45.X-ray diffraction(XRD)analysis and thermogravimetric analysis were used to determine the hydration products,while mercury intrusion porosimetry(MIP)was used to measure pore structure.The results indicated that the FCSA cement hydration showed a concentrated heat release at early age.The compressive strength of specimens consistently increased over time,where seawater curing enhanced the compressive strength of control samples.The pH value of pore solution decreased to 10.7−10.9 at 90 d when cured in seawater.The primary hydration products of FCSA cement included ettringite,iron hydroxide gel(FH_(3)),and aluminum hydroxide gel(AH_(3)).Moreover,when cured in seawater,Friedel’s salt was formed,which enhanced the compressive strength of the specimen and increased its coefficient of corrosion.Seawater curing gradually increased sample mass,and GGBS refined pore structure while reducing harmful pore proportions.These results suggest that while GGBS can refine pore structure and improve certain aspects of performance,its inclusion may also reduce compressive strength,highlighting the need for a balanced approach in its use for marine applications.本研究旨在探究海水环境下磨细粒化高炉矿渣(GGBS)对高铁硫铝酸盐(FCSA)水泥水化性能的影响。研究中,针对水胶比为0.45的FCSA水泥浆体,测试了其水化热、抗压强度、质量变化以及孔隙溶液的pH值。通过X射线衍射(XRD)和热重分析对水化产物进行分析,并利用压汞法(MIP)测定孔结构。结果表明,FCSA水泥早期水化放热集中。自来水固化条件下样品的抗压强度随着时间的推移持续增加,海水固化条件下,对照样品的抗压强度有所提升,而添加GGBS后抗压强度下降。随着固化时间的延长,水泥浆体的pH值呈先上升后下降的趋势;海水固化会降低体系的pH值,而添加GGBS则会升高体系的pH值。FCSA水泥的主要水化产物包括钙矾石、氢氧化铁凝胶(FH3)和氢氧化铝凝胶(AH3)。此外,海水固化会生成弗里德尔盐,从而增强了样品的抗压强度并增加了其抗蚀系数。海水固化使样品的质量逐渐增加,GGBS有效细化了孔隙结构,并减少了有害孔的比例。

关 键 词：ferrite-rich calcium sulfoaluminate cement seawater ground granulated blast furnace slag HYDRATION MICROSTRUCTURE 

分 类 号：TU4[建筑科学—土工工程]