摘要
为实现超高性能水泥基复合材料(ultra-high performance cementitious composite,UHPCC)的可持续性和环保性,以玻璃砂替代UHPCC中的河砂,制作玻璃砂超高性能水泥基复合材料(glass sand ultrahigh-performance cementitious composite,GS-UHPCC),通过开展力学性能试验,探讨不同玻璃砂替代率和玻璃砂粒径对GS-UHPCC抗压、抗折性能的影响,定量表征GS-UHPCC的弯曲韧性和能量吸收能力,并通过X射线衍射和扫描电镜试验,分析了玻璃砂的增韧机理.结果表明,以平均粒径为0.27 mm的玻璃砂替代河砂,当体积替代率为40%时效果最好,替代后GS-UHPCC在养护28 d时的抗压强度相较于未掺时提升了17.0%,抗折强度提升了14.8%,能量吸收能力最优,微观结构致密,水化反应最为完全.本研究得出的最优玻璃砂替代率与粒径,可为GS-UHPCC的应用提供可行性支持.
To achieve sustainability and environmental protection capability of ultra-high-performance cementitious composite(UHPCC),glass sand(GS)was used to replace river sand in UHPCC to produce glass sand ultra-highperformance cementitious composite(GS-UHPCC).The effects of different glass sand substitution rates and particle sizes on the compressive and bending properties of GS-UHPCC were investigated through mechanical property tests,the bending toughness and energy absorption capacity were quantitatively characterized as well.In addition,the Xray diffraction and scanning electron microscopy methods were used to analyze the toughening mechanism of the glass sand.The results show that replacing river sand with glass sand with an average particle size of 0.27 mm is the most effective at a substitution rate of 40%.After substitution,the compressive strength of GS-UHPCC increased by 17.0%,and the flexural strength increased by 14.8%compared to the unaltered mixture after 28 days of curing.The energy absorption capacity was optimal,and the microstructure was dense,and the hydration reaction was almost complete.The optimal glass sand substitution rate and particle size obtained in this study can provide feasible support for the application of GS-UHPCC.
作者
张亚芳
曾科
包嗣海
段莉斌
张维健
ZHANG Yafang;ZENG Ke;BAO Sihai;DUAN Libin;ZHANG Weijian(School of Civil Engineering,Guangzhou University,Guangzhou 510006,Guangdong Province,P.R.China)
出处
《深圳大学学报（理工版）》
CSCD
北大核心
2024年第1期66-73,共8页
Journal of Shenzhen University(Science and Engineering)
基金
国家自然科学基金资助项目(52278250)
关键词
混凝土
超高性能水泥基复合材料
玻璃砂
力学性能
水化反应
火山灰效应
能量吸收能力
concrete
ultra-high performance cementitious composite
glass sand
mechanical properties
hydration reaction
pozzolanic effect
energy absorption capacity
