Properties of concrete incorporating nano-silica

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Beneficial role of nanosilica in cement based materials – A review (2013, background): “However, when the nanosilica content increased from 3% to 6% by weight of cement, it did not show any improvement in calcium hydroxide consumption [79].”
Effects of Nanosilica on Compressive Strength and Durability Properties of Concrete with Different Water to Binder Ratios (2016, result): “As far as compressive strength is concerned, controversial results were obtained sorting enhancements from notable [8, 9] to moderate [10–14], even though no gains were reported [15, 16].”
State-of-the-art report on use of nano-materials in concrete (2014, background): “Hosseini et al. (2011), Said et al. (2012) and Ji (2005) observed such effects in the case of nano-SiO2.”
Characterization of alkali activated slag–fly ash blends containing nano-silica (2015, background): “Due to its considerably fine particle size, nano-silica has been observed to accelerate the hydration process at early ages [23], refine the pore structure [24,25] and enhance the mechanical properties even at small levels of replacement [26].”