Physical modification of polypropylene fibers used in construction

摘要

One of the applications of polypropylene fibers (PP) is in construction like reinforcement in concretes. Research on the use of PP fibers in silicate composites already has fairly long history. But there are some disadvantages, which must be eliminated. Observed, low affinity between the fibers and cement matrix is associated with nonpolar, hydrophobic, physical, and chemical inactive polyolefinic character of this polymer. The increase in adhesion of PP fibers to matrix could be achieved with the physical modification of PP fibers with inorganic additive. The most importance inorganic additive into concrete is silica fume. The aim of our paper is the presentation of the influence of modification on properties of PP fibers. There will be evaluated the optimization of composition (contents of nanoadditive and dispersant) of prepared PP fibers based on the mechanical and thermomechanical properties, the sorption moisture as well as on the macromorphological structure of PP surface.