Chloride permeability of concrete containing nano-particles for pavement

Chloride permeability of concrete containing nano-particles for pavement is experimentally studied. Both nano-TiO2 and nano-SiO2 are respectively used to be as the additives. For comparison, chloride permeability of plain concrete and concrete containing polypropylene (PP) fibers is also experimentally studied in this work. The test results indicate that the resistance to chloride penetration of concretes containing nano-particles is improved. The resistance to chloride penetration of concretes containing nano-TiO2 is better than that containing the same amount of nano-SiO2. The enhanced extents of the resistance to chloride penetration of concretes decrease with increasing content of nano-particles. However, the resistance to chloride penetration of concretes containing PP fibers is reduced. For the concrete containing both nano-particles and PP fibers, the resistance to chloride penetration is also decreased. Finally, the relationship between the chloride diffusion coefficient and compressive strength of concretes is obtained, which indicates that the chloride permeability of concrete decreases with increasing compressive strength.