Abstract
Regarding the performance of Nano-silica in cement based materials such as cement paste, mortar and concrete there are different outcomes revealed by researchers that fluctuates around significant increase or decrease in resistance of due materials. In the present research the impact of different kinds of Nano-silica whether powder or colloids form and special plane with 80 to 500 m2/ gr on characteristics of new and hardened mortar has been investigated. The results indicated that Nano-silica contributes to dramatic decrease in performanceality. As such, to compensate the loss one needs to use super plasticizer. Using Nano-silica increases pressure resistance regarding control mortar and in some cases the level of pressure is more than mortar containing silica fume. Also the majority of increase in Nano-silica resistance takes place during seven days. The size of Nano-silica particles in this research was evaluated by Transmission Electron Microscopy (TEM).
Highlights
With regard to the successful use of silica fume with purity of 90 percent and special plane about 20 m2/gr as a super pozzolana in production of high-performance concrete (HPC) and high-strength concrete, and on the other hand the availability of Nano-silica materials with 100 percent purity and special plane of 60 m2/gr to about 600 m2/gr, investigating the possibility of usage of Nano-silica materials in improving the characteristics of cement based materials has changed into one of the most interesting field of research in recent years all over the world
Jo and et al reported that the impact of Nano-silica materials in its powder form with particle size of 40 nm and special plane of 60 m2/gr in consumption rates of [3, 6], and 10 with 12 % cement weigh value showed the maximum resistance increase in 7 days with 12 % usage of Nano-silica contributing to 177 % value in contrast to control mortar while the maximum value in silica fume took place in 15 % and contributed to 42 %
The amount of needed super plasticizer to maintain the performance of mixtures containing Nano-silica particles and silica fume is regarded as an index of the impact of used materials on the performance of the mixtures
Summary
With regard to the successful use of silica fume with purity of 90 percent and special plane about 20 m2/gr as a super pozzolana in production of high-performance concrete (HPC) and high-strength concrete, and on the other hand the availability of Nano-silica materials with 100 percent purity and special plane of 60 m2/gr to about 600 m2/gr, investigating the possibility of usage of Nano-silica materials in improving the characteristics of cement based materials has changed into one of the most interesting field of research in recent years all over the world. The results indicated that the optimum value of Nano-silica is in 3 percent and the rate of resistance increase in contrast to control group shows 6 % in 7 days and 4/5 % in 28 days. Jo and et al reported that the impact of Nano-silica materials in its powder form with particle size of 40 nm and special plane of 60 m2/gr in consumption rates of [3, 6], and 10 with 12 % cement weigh value showed the maximum resistance increase in 7 days with 12 % usage of Nano-silica contributing to 177 % value in contrast to control mortar while the maximum value in silica fume took place in 15 % and contributed to 42 %. To do so the impact of different usages of values and ages of powder and colloid Nano-silica with different special planes in a laboratory program were determined and compared with the performance of silica fume as a known super pozzolana
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
