摘要
框架柱节点易因荷载及温缩干缩效应开裂,常规手段修复难度大。研究以PO 42.5水泥等为基材,复配脲醛树脂基微胶囊与聚丙烯腈纤维,设计1个对照组和4个试验组,制备300 mm×300 mm×450 mm节点试样并开展力学、裂缝及自修复性能测试。结果表明,试验组3(纤维2.0 kg/m^(3)、微胶囊20 kg/m^(3))性能最优,其抗压强度46.7 MPa、抗折强度6.9 MPa,较对照组分别提升10.40%、35.29%,平均裂缝宽度58μm。且裂缝修复后轮廓大幅淡化。
Joints of frame columns are prone to cracking due to load effects,as well as temperature shrinkage and drying shrinkage effects,and such cracks are difficult to repair with conventional methods.In this study,Portland cement PO 42.5 was used as the base material,compounded with urea-formaldehyde resin-based microcapsules and polyacrylonitrile fibers.One control group and four experimental groups were designed,and joint specimens with dimensions of 300 mm×300 mm×450 mm were prepared for mechanical property,crack and self-healing performance tests.The results show that experimental group 3(with 2.0 kg/m^(3)of fibers and 20 kg/m^(3)of microcapsules)exhibited the optimal performance.Its compressive strength reached 46.7 MPa and flexural strength reached 6.9 MPa,which were 10.40%and 35.29%higher than those of the control group,respectively;the average crack width was 58μm.Moreover,the outline of cracks was significantly faded after self-healing.
作者
封立志
FENG Li-zhi(Guilin Institute of Aerospace Technology,Guilin 541004,China)
出处
《建材世界》
2026年第2期53-55,69,共4页
The World of Building Materials
关键词
自修复混凝土
框架柱节点
裂缝控制
聚丙烯腈纤维
self-healing concrete
frame column joint
crack control
polyacrylonitrile fiber
