Abstract
Durability of concrete is greatly affected by water absorption and its transportation. A less permeable concrete is more durable. Nano Silica (NS) when added to concrete can perform as a filler material and also participate in pozzolanic reaction to improve the density of concrete. In this investigation, concrete samples were made by adding NS to concrete. The compressive strength increased with increase in NS content up to 1.5%. Ultrasonic pulse velocity test showed improvement in concrete’s density with increase in NS content. Sorptivity test demonstrated the reduction of surface absorption with increase in NS. Reduced chloride ion penetration was also prominent during Rapid Chloride Penetration Test (RCPT). Relation between water absorption and current passed was found, and using this relation, prediction chart and formula were proposed.
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