The synergic influence of nano-silica and carbon nano tube on self-compacting concrete

Test results showed that NS worsened the fresh concrete properties due to its higher water demand, but in presence of FA, NS improved these properties significantly and removed segregation and bleeding effects of 40% FA. Also, the CNT substitution in concrete provided 20% increase in toughness index of SCC. According to test results, the mix with 2% NS, 0.02% CNT and 40% FA can be considered as the best SCC mix due to discussed specifications. Finally, besides all convenient fresh properties, by support of NS and CNT, the inclusion of high volume of FA enabled to sustainable construction and production of a more environment-friendly concrete with improved mechanical properties. Moreover, CNT resulted in more ductile concrete with higher energy-absorbing capacity.