To improve the interfacial bonding properties of polypropylene fiber-cement matrix, a new type of nano-silica modified polypropylene fibers was prepared by direct blend-spinning. As a comparison, Another polypropylene fiber was modified by surface chemical deposition of the silica particles by sol-gel method. The distribution of nano-particles on the fiber surface was observed with scanning electron microscope (SEM). This paper focuses on the effects on crack-resistance properties of fiber reinforced mortar(FRM) and present the mechanism of improving fiber-matrix interfacial properties, especially. The results demonstrate that the modified fiber with well-distributed of nano-silica has excellent mechanical properties, and crack resistance. The interfacial property of fiber-matrix is improved because of silica’s hydration activity. As the use of two kinds of modified fiber, the cementitious materials crack area is significantly decreased. In conclusion, the modified fiber by chemical deposition method which has slightly better overall performance.

CPF is a kind effective and promising non-woven liner for common formwork to improve the concrete property. This paper review the definition, structural characteristics, effectiveness and engineering applications of CPF, moreover, the problems and further development direction of CPF also have been discussed.

This article prepared a new type PVA fiber with large diameter by plasticizing melt spinning method, which instead of traditional wet-spinning or gel-spinning method. The mechanical properties and microstructure of fiber were characterized by tensile instrument respectively and SEM. Then, the PVA fiber was used in cementitious composites after surface sizing. The test result shown that: the melt-spinning PVA fiber could achieve stress-strain hardening in ECC system, and appeared multi-cracking phenomenon, the flexural deflection and strength is not worse than the Japan Kurary PVA fiber. Finally, the PVA has an advantage in price.