Experiment on sealing efficiency of carbon fiber composite grout under flowing conditions

Abstract The greatest difficulty of grouting fractures under flowing condition was that the slurry was easily washed out by the flowing. To raise the sealing efficiency (SE) and dynamic flowing resistance of slurry, carbon fiber was added into the grout and a new grout for flowing water environmental was provided. Contrast tests and SEM tests were conducted to investigate the effect of carbon fiber. The result showed that the solidification velocity and dynamic flowing resistance increased with an increase of carbon fiber content due to the stochastic distribution and great surface friction of carbon fiber. In addition, a series of orthogonal tests were conducted to investigate the effect of some factors on the SE. The result showed that the SE decreased with the increase of initial flow speed and aperture width, and it increased with the increase of cement water ratio and additive content. Finally a fitting equation was acquired to provide reference to the practical engineering.