Abstract
Effects of Nano-Silica modified Self-Compacted, High Volume Fly Ash Mortar on Slump Flow and Compressive Strength
Highlights
The conventional concrete has few disadvantages mainly with its differential compaction, its durability and noise caused by the vibrating instrument
The compressive strength of mortar containing 70% of fly ash replacement to cement and 5% addition of nano-silica has been improved by 94%
Utilizing Nano Silica (NS) in high volume fly ash can be a possible solution to problem related to the strength loss in self-compacting concrete (SCC), and the early poor strength development of HVFA in SCC due to NS high pozzolanic reaction, filler effect, and activation of fly ash pozzolanic reactivity
Summary
The conventional concrete has few disadvantages mainly with its differential compaction, its durability and noise caused by the vibrating instrument. In this study the workability and compression strength of self-compacting cement mortar utilizing the binary products such as high volume fly ash and nanosilica had been carried out. Mondal.P et al [13] and Senff.L et al [14] had worked on the effect of fresh properties like flowability and setting time, they found that flow decreases as the nanosilica addition increased and they suggested that nanosilica in cement mortar had improved the strength and durability. Jo et [15] explored the nanosilica modified cement mortar using 40nm size nano particles, they notified that strength increase about 170% on control mortar mix and 100% on silica fume mixture and they had described that nanoparticles behaved like a nucleus in bonding the hydrated cement, a strong gel structure formed, it improved the hardened mechanical properties. The SP contents for slump flow are summarized in the Table 3
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