Fine aggregate used for this study is ennore sand obtained from Ennore, Tamilnadu. Ennore sand, composed of three grades (Grade I, Grade II and Grade III having the sizes 1 mm to 2 mm, 0.5 mm to 1 mm and 0.09 mm to 0.5 mm respectively), each one corresponding to 33.33% weight, was used as fine aggregate in the mortar. Table 2, shows the physical and chemical properties of the ennore sand.
Nano silica was synthesized from rice husk ash. The particle size analyses for synthesized Nano silica are shown in Fig. 1. The synthesized NS has a density of 3.2 g/cc with spherical shape and having particle refractive index 2.55. From the graph, the percentile varied from 110 nm to 249 nm. Nano metakaolin was obtained from ASTRRA chemicals, Chennai. The particle size analyses for nano metakaolin are shown in Fig. 2. Nano metakaolin have on average size of 223 nm at 10% and gradually increase up to 551 nm at 95%.