Abstract: Water in the external environment of the textile reinforced concrete(TRC)migrates along the direction of the internal directional fiber bundles， which causes the degradation of the impermeability of the internal matrix of the textile reinforced concrete. This paper studies the effects of the water-cement ratios， the textile sizes， and the fiber bundle Tex content in concrete matrix on the impermeability of TRC both in macro and micro scale. Meanwhile， the roughness of concrete was evaluated based on fractal dimension through nuclear magnetic resonance test. The results show that the impermeability of TRC decreases with the decrease of the mesh size of the textile， the increase of the Tex content and the increase of the water-cement ratio. A TRC seepage prediction model was also established based on the dimensional analysis method and permeability test， which can be used to describe the impermeability performance of TRC.

Key words: textile; concrete; impermeability; scanning electron microscope; nuclear magnetic resonance