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Nano Silica Research Paper

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Recently, Nano silica appears to be one of the attractive cement substitution alternatives for researchers. There are some reports studied using Nano silica as cement-based building material and other studied the mix with other Nano materials. Compared to other Nano materials, Nano silica has a unique advantage in the potential pozzolanic reaction with cement hydration products. Due to its ultra fine particle size, it can possess a distinct pozzolanic reaction at a very early age (16). one of the promising applications of Nano silica is to promote the hydration of cement blended with fly ash, slag or other pozzolanic materials(21; 7; 22).

Some authors concluded that Nano silica can improve concrete workability and strength (23; 24; 25). Also others concluded that when NS (wt.%) is mixed into the cement mortar in the fresh state it has a direct influence on the water amount required in cement mixtures, for that higher amounts of water or chemical admixtures are needed to keep the workability of the mixture (26; 27; 16).
2.2.2. Influence of Nano silica addition on cement pastes, and mortars
Hui Li et al.(2003) studied the mechanical properties of Nano-Fe2O3 and …show more content…

The results showed that the compressive strengths of mortars with Nano silica particles were all higher than those of mortars containing silica fume at 7 and 28 days. It is concluded that the Nano-particles are more valuable in enhancing strength than silica fume since strength increased as the Nano silica content increased from 3% to 12%. However, they demonstrated that using higher content of Nano silica must be accompanied by adjustments to the water and superplasticizer dosage in the mix in order to ensure that specimens do not suffer cracking. Otherwise, using this much quantity of Nano-SiO2 could actually lower the strength of composites instead of improving it, although this finding was not observed in their

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