Fracture toughness of carbon nanotubes modified cement based materials

Abstract

In order to increase the fracture toughness of concrete, dispersed fiber reinforcement is increasingly used in practice. The initiation of crack initiation occurs at the nanoscale in the cement matrix. Thus, the use of nano-reinforcement with dispersed nanoparticles can have a positive effect on the fracture toughness of the cement composite. It is proposed to consider carbon nanotubes (CNTs) as such nanofibers. This article discusses the possibility of using nanocarbon tubes as elements for restraining the development of cracks at the nanoscale in cement composite. The results of testing nanomodified cement stone for strength indicators, fracture toughness indicators, results of nanoindentation, ultrasonic sounding and infrared spectroscopy are presented. A structural model of a cement stone dispersed-reinforced with nanocarbon tubes is considered.