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Nano Silica
Properties of ultra high strength concrete incorporating nano-silica
ABSTRACT The objective of this investigation is to study the effect of nano-silica addition on the fresh and hardened properties of ultra high strength concrete. Nano-silica with 99.8% SiO2 content and particles size of 5 to 20 nm used in concrete mixes as a replacement of silica fume content. The total percentage of silica fume and nano-silica was 20% of weight of binder content. Nano-silica was added in seven percentages.
properties of ultra high strength concrete was investigated through twenty seven concrete mixes using nano-silica addition with three different binder content 450, 550, and 650 kg/m3. Nanomaterials have a larger value of the ratio between surface area and volume than other similar particles in larger size , making the nanomaterials more reactive.
Slump test, Compacting factor test and Ve-Be time test were used to determine the effect of nano-silica content on the workability of concrete, while compression test, indirect tensile strength test, flexural strength test,
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