▎ 摘　　要

Polytetrafluoroethylene nanoparticles (PTFENPs) are a potentially important alternative nano additive in the design of durable structures, due to their extremely strong carbon-fluorine and carbon-carbon covalent bonds and high melting point. The aim of this study was to analyze the effect of PTFENPs on the mechanical properties, durability, and microstructure of cement pastes. The results showed that cement pastes containing 0.5% PTFENPs have a 1.765-fold and 1.297-fold higher compressive strength than that of control samples, as well as a 1.445-fold and 1.040-fold greater compressive strength than cement pastes modified with 0.1% graphene oxide at 28 days and 90 days, respectively. Addition of 0.05% PTFENPs in cement pastes increased the ultrasonic pulse velocity by 1.870-fold and 1.058-fold at 28 days and 90 days, respectively. Thermo gravimetric analysis (TGA), found that multi-wall carbon nanotubes and silver nanoparticles caused the highest increases in portlandite content compared to that of the reference sample, while 16.1% higher AFt and C-S-H content was obtained with the addition of 0.1% PTFENPs.