不同孔径碳纤维三向织物复合材料增强混凝土轴压研究  

Research on axial compression of concrete reinforced with carbon fibre triaxial fabric composites with different pore sizes

作　　者：孙婷婷 张洪华 Muhammad Usman Ghani 李炜[1,2,3] SUN Tingting;ZHANG Honghua;Muhammad Usman Ghani;LI Wei(College of Textiles,Donghua University,Shanghai 201620,China;Civil Aviation Composites Collaborative Innovation Centre,Donghua University,Shanghai 201620,China;Ministry of Education Engineering Research Centre for Technical Textiles,Shanghai 201620,China)

机构地区：[1]东华大学纺织学院,上海201620 [2]东华大学民用航空复合材料协同创新中心,上海201620 [3]产业用纺织品教育部工程研究中心,上海201620

出　　处：《复合材料科学与工程》2025年第3期87-95,共9页Composites Science and Engineering

摘　　要：选用三种规格的T300碳纤维制备三种不同孔径大小的三向织物(Triaxial Woven Fabric,TWF)树脂基复合材料对混凝土进行加固。使用3D-DIC技术获取三维位移场和应变场,直观反映试样表面织物的膨胀脱落和不同纱线应变扩展的演化过程。结果表明:碳纤维三向织物复合材料在压缩时,三向织物的孔径越小,约束效果越显著。与未约束的混凝土相比,TWF-24K的峰值载荷提高了38.7%,TWF-12K提高了41.2%,TWF-6K提高了49.9%。在孔隙率一定时,小孔径TWF更大程度地提升了混凝土的抗压强度和延性;TWF-6K试样的应变-时间曲线变化趋势更加一致,试样内部的应力分布更均匀。结合3D-DIC技术获取从加载到破坏整个时间序列的位移场和应变场演化规律,结果表明相比于TWF-12K和TWF-24K,TWF-6K经纬纱均提供了约束作用,均匀分担轴向压缩力和径向拉伸力,具有最好的约束效果。Three sizes of T300 carbon fibres were selected for the preparation of triaxial woven fabric(TWF)resin-based composites with different pore sizes for concrete reinforcement.The three-dimensional displacement and strain fields were obtained using 3D-DIC technology,which visually reflected the evolution of the fabric expansion and shedding on the surface of the specimen and the strain extension of different yarns.The results show that the smaller the pore size of the triaxial fabric,the more significant the restraining effect of the carbon fibre triaxial fabric composite in compression.Compared with unconfined concrete,the peak load of TWF-24K was enhanced by 38.7%,TWF-12K by 41.2%and TWF-6K by 49.9%.At a certain porosity,the small pore size TWF enhances the compressive strength and ductility of concrete to a greater extent;the strain-time curves of TWF-6K specimens have more consistent trends and the stress distribution inside the specimens is more uniform.Combined with the 3D-DIC technique to obtain the displacement and strain field evolution laws for the whole time series from loading to damage,it shows that TWF-6K provides the best restraining effect compared to both TWF-12K and TWF-24K warp and weft yarns by evenly sharing the axial compression and radial tensile forces.

关 键 词：碳纤维三向织物 混凝土加固 3D-DIC 位移场 三维应变场 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]