基于同心环形缝隙流理论的纤维编织网增强混凝土抗渗性能研究

Impermeability of Textile Reinforced Concrete Based on Concentric Circular Slit Flow Theory

通过对压力水作用下纤维编织网增强混凝土(TRC)的渗透试验和扫描电镜(SEM)试验,探究不同水灰比、纤维单丝含量对TRC试件抗渗性能及内部细观结构的影响。研究表明,自由水在压力作用下沿着混凝土基体与纵向纤维束的界面进行定向迁移,TRC的抗渗性能随水灰比及纤维单丝含量增大而减弱。此外,SEM试验表明,混凝土基体与纤维束的界面存在环形裂隙,裂隙宽度随水灰比及纤维单丝含量增大而增大。基于同心环形缝隙流理论,建立压力水作用下TRC试件渗透率的计算公式,计算结果与试验值吻合较好。

Based on the permeability test and scanning electron microscope(SEM)test of textile reinforced concrete(TRC)specimens under pressure water,the effects of different concrete water-cement ratios and fiber number of per bundle on the impermeability and internal mesostructure of TRC specimens were explored.The results show that,moisture migrates along the interface between concrete matrix and longitudinal fiber bundle under pressure water and the impermeability of TRC specimens decreases with the increase of water-cement ratio and fiber number of per bundle.Furthermore,SEM test shows that there are annular cracks at the interface between concrete matrix and fiber bundle,and the crack width increases with the increase of water-cement ratio and fiber number of per bundle.Based on the concentric circular slit theory,the impermeability calculation model of TRC specimen under pressure water is established,and the calculated results are in good agreement with the experimental values.