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Effect of nano-silica on properties of blended cement Sand: Ennore sand conforming to IS: 650-1966 was used. Physical properties are given in Table.3. The cement to fine aggregate ratio was maintained at 1:3(by weight) in the mortar mixes. Superplasticiser: Commercial superplasticiser was used. Based on a number of trials, 0.8% (by weight of cement) was arrived. Silica Fume: Silica fume was used in the present investigation. 9% of the cement was replaced by silica fume, where maximum compressive strength was achieved. The chemical composition is given in Table. 4. Nano-Silica: Nano-SiO 2 (NS) was used in the present experimental study. Properties provided by manufacturer are given in Table. 5 www.<strong>ijcer</strong>online.com ||May ||2013|| Page 51
Effect of nano-silica on properties of blended cement III. METHODS: The opted percentages of Nano-SiO 2 (NS) were 1, 2, 3, and 4% for this experimental study. The percentages were arrived based on the literature. After number of combinations tried, a combination (91%OPC + 9% SF + 0.8% SP) was fixed for reference specimens where maximum compressive strength was attained. The physical properties of reference specimens are given in Table. 5. Details of mix proportions for test mortars containing silica fume and nan-SiO 2 are given in Table 6. Four series of specimens were cast for test. The test specimens were cast with (91% OPC + 9% SF + 0.8% SP + NS). Silica fume was replaced with 1, 2, 3 and 4% of Nano-SiO 2 (NS) particles for test specimens. The quantities of cement, Ennore sand and mixing waters for each specimen were 200g, 600g and (P/4) + 3 where P denotes the percentage of mixing water required to produce a paste of standard consistence for reference . The obtained water cement ratio for reference was constant for four series of test samples. In four series of test samples, the amount of superplasticizer was arrived in test samples for a constant water to cement ratio of (28%). Initial and final setting times were found out by Vicat’s apparatus. Le-Chatelier equipment was used to find soundness of reference and test specimens. The reference and test specimens were prepared using standard metallic cube mould of size 7.06 X 7.06 X 7.06cm for compressive strength of mortar. The blended cement to sand ratio was 1: 3 by weight throughout the tests. The compressive strength of reference and test specimens was studied at different ages, at 3, 7, 28, and 60 days. The compacted specimens in mould were maintained at a controlled temperature of 27 ± 2 0 and 90 percent relative humidity for 24 hours by keeping the moulds under gunny bags wetted by the deioned water and then demolded. After demolding, the specimens were cured in deionised water for 27 days. From the experiments of setting and soundness tests, an average of three values was used to compare the results of the reference specimens. In the case of compressive strength tests, three test specimens were compared with three reference specimens. IV. TEST PROCEDURE: The cement mortars were mixed in a rotary mixer. Nano particles are not dispersing uniformly due to their high surface energy. Accordingly, mixing was performed as follows. www.<strong>ijcer</strong>online.com ||May ||2013|| Page 52
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