摘要
针对再生骨料强度和延性较低、尾矿资源化利用率较低、地聚物混凝土较脆等缺陷,通过采用纤维增强复合材料(FRP)对混凝土进行约束用来改善其强度和延性等力学性能,并提高资源化利用率。因此,以FRP类型、FRP层数、核心混凝土轴心强度等级为变量设计了14组共计42个试件,对FRP约束尾矿粉地聚物再生混凝土(FRP-GRC-TP)的轴压性能进行了试验研究和理论模型分析。结果表明:核心混凝土的强度和延性显著提高,FRP层数越多,增强作用越强,且FRP约束低强度等级混凝土的增强效果更加明显。提出的2个建议拟合强度模型和1个建议拟合极限应变模型的理论计算值与试验值误差较小,对FRP约束尾矿粉地聚物再生混凝土的强度和极限应变的预测精准度高。
Aiming at the defects of low strength and ductility of recycled aggregate,low utilization rate of tailings and relative brittleness of geopolymer concrete,fiber reinforced polymer(FRP) was adopted to restraint concrete for enhancing the utilization rate of resources and ameliorating the mechanical properties such as strength and ductility.Therefore,taking the type of FRP,the number of FRP layers and the axial strength grade of core concrete as variables,a total of 42 specimens in 14 groups were designed to carry out axial compressive performance test research and theoretical model analysis of FRP-constrained geopolymeric recycled concrete mixed with tailing powder(FRP-GRC-TP) in the paper.The results showed that the FRP-GRC-TP composite structure significantly improved the strength and ductility of core concrete,and the more layers of FRP,the stronger the enhancement effect.In addition,the enhancement effect of FRP-constrained low-strength concrete was more obvious.The two suggested fitting strength models and one suggested fitting limit strain model proposed in the study had small errors between theoretical calculated values and experimental values,and showed a high prediction accuracy for the strength and ultimate strain of FRP-GRC-TP.
作者
毛志杰
黄靓
吴越
曾令宏
邓鹏
李隐
MAO Zhijie;HUANG Liang;WU Yue;ZENG Linghong;DENG Peng;LI Yin(College of Civil Engineering,Hunan University,Changsha 410082,China;Guangzhou Municipal Housing and Urban-Rural Construction Industry Monitoring and Research Center,Guangzhou 510000,China;Huzhou Civil Air Defense Engineering Quality Supervision Station,Huzhou 313000,China)
出处
《工业建筑》
北大核心
2023年第6期209-217,共9页
Industrial Construction
基金
国家重点研发计划项目(2019YFC1904700)
工信部课题(TC210H029)。
关键词
FRP
地聚物再生混凝土
尾矿粉
轴压性能
理论模型
FRP
geopolymeric recycled concrete
tailing powder
axial compressive performance
theoretical model
