内置纤维胶液管钢筋混凝土梁裂缝自愈合行为试验和分析

混凝土及其结构能够自动适应环境, 在受到损伤后能够自行愈合, 是解决结构中的混凝土材料损伤的最佳途径。本文根据生物体损伤愈合的原理, 设计了一种具有裂缝自愈合行为、内置纤维胶液管的钢筋混凝土梁,混凝土受拉开裂时, 纤维胶液管破裂, 其中的修复胶粘剂流出, 愈合裂缝。首先, 分析了修复纤维对混凝土自愈合效果的影响因素; 然后, 从修复纤维微分单元的平衡状态, 得到了修复纤维能及时发挥修复作用的合理参数;最后, 通过三分点弯曲试验, 验证了梁的裂缝自愈合能力; 分别采用不同的修复胶粘剂进行了试验, 得到了一种适合钢筋混凝土梁裂缝自愈合的理想胶粘剂。

EXPERIMENTS AND ANALYSES OF THE SELF-HEALING OF CRACKS IN REINFORCED CONCRETE BEAMS WITH EMBEDDED FIBERS FILLED WITH ADHESIVE

The best way of repairing the damage of concrete materials in structures is to enable the concrete and concrete structures adapt to the surrounding environment actively and have self-repairing capabilities.In this paper,according to the self-healing principles of biomaterials,a type of reinforced concrete beam with embedded fibers filled with adhesive capable of crack self-healing is suggested.The influence of repairing fibers on crack self-healing is systematically studied.The proper parameters of repairing fibers are acquired from the equilibrium of a differential element.The self-healing ability of cracks in a reinforced concrete beam using embedded fibers filled with adhesive is confirmed using 3-piont bending tests,and an ideal adhesive is identified from experiments with different adhesives.