纳米硅灰包覆矿渣复合微粉对水泥基材料流变性能的影响研究  

Effect of nano-silica fume-cladded slag composite micro-powder onthe rheological properties of cement-based materials

作　　者：李正虎 刘云 敖进清[2] 李光照[2] 杨新志 和振海 李严 李昱 LI Zhenghu;LIU Yun;AO Jinqing;LI Guangzhao;YANG Xinzhi;HE Zhenhai;LI Yan;LI Yu(Yunnan Menglv Expressway Investment and Development Co.,Ltd.,Pu'er 665000,China;School of Materials Science and Engineering,Xihua University,Chengdu 610039,China;China RailwayKaitou Menglv Expressway Project Headquarters,Pu’er 665900,China)

机构地区：[1]云南勐绿高速公路投资开发有限公司,云南普洱665000 [2]西华大学材料科学与工程学院,成都610039 [3]中铁开投勐绿高速公路工程指挥部,云南普洱665900

出　　处：《功能材料》2025年第4期4111-4119,共9页Journal of Functional Materials

基　　金：云南省交通运输厅科技创新及示范项目(2021-102)。

摘　　要：掺合料的颗粒分布与表面特性对喷射混凝土的早期强度提升和回弹率降低至关重要。以硅灰(SF)和矿渣微粉(GGBFS)为原料,制备了纳米硅灰包覆矿渣复合微粉,系统探讨了其对水泥浆体结构、流变性和力学性能的影响,并在工程中应用。结果表明,当SF的含量为50%时,矿渣复合微粉展现出优异的综合性能。相较于单掺SF,掺入矿渣复合微粉的水泥浆体初始屈服应力提高32%,塑性粘度降低9.8%。矿渣复合微粉掺量为8%时,喷射混凝土1 d强度从未掺时的10.9提高到16.4 MPa,回弹率从26.1%降至7.3%。研究结果对推动新型微纳米复合材料作为掺合料在混凝土中的低成本、规模化应用有重要意义。同时也为在“双碳”背景下工业固废的综合利用提供了有效途径。The particle size distribution and surface characteristics of admixtures play a crucial role in enhancing the early strength and reducing the rebound rate of shotcrete.In this study,a slag-based composite powder coated with nano-silica fume was synthesized using silica fume(SF)and ground granulated blast furnace slag(GGBFS)as raw materials.The effects of this composite powder on the rheological and mechanical properties of cement-based materials were systematically investigated.The results demonstrated that when the SF content reached 50%,the composite powder exhibited excellent overall performance.It improved the early compressive strength of cement-based materials by more than 9%,while maintaining stable long-term strength.Compared to the direct incorporation of SF into cement slurry,the initial yield stress of the slurry increased by 32%,while the plastic viscosity decreased by 9.8%.When the slag composite powder content was 8%,the 1-day compressive strength of shotcrete increased from 10.9 MPa to 16.4 MPa,and the rebound rate dropped significantly from 26.1%to 7.3%.These findings provide valuable insights for promoting the large-scale,cost-effective application of novel micro-nano composite admixtures.Additionally,this study offers a sustainable approach for the comprehensive utilization of industrial solid waste in alignment with the“dual carbon”strategy.

关 键 词：流变性 矿渣复合微粉 水泥基复合材料 显微结构 

分 类 号：U414[交通运输工程—道路与铁道工程]