The Effect of Adding Nano-Silica on the Ultrasonic Pulse Velocity of Geopolymer Concrete

Nanotechnology plays an important role in the current construction industry. it hasbeen observed that several properties of cement-based concrete are affected by differentnano materials. in this study, different weight percentages of nano-silica (0, 1, 2, and4 wt%) were used to build geopolymer specimens. the mechanical properties of thespecimens were then measured, including the compressive and flexural strength. resultsdemonstrated that increasing the percentage of nano-silica from 0 to 4 wt% increases thecompressive strength of the specimens from 50.4 to 75.2 mpa and the flexural strengthfrom 11.4 to 26.2 mpa. furthermore, it was observed that the ultrasonic pulse velocitywas altered by increasing sio2 (nano-silica), decreasing the ultrasonic pulse rate from7.0 to 4.5 km.s^-1.