IRJET- STUDY OF PROPERTIES OF SCC CONTAINING MICRO AND NANO SILICA (original) (raw)

Self Compacting Concrete (SCC) is considered to be the most successful innovation in construction industry. Over a very short period of time SCC has progressed from the initial concepts of desired functions to routine use in competitive construction markets. It is a special type to concrete with different compositions as compared to normal concrete i.e. there are more amounts of fine aggregates as compared to coarse aggregates which are vice-versa in normal concrete. SCC deforms under its own weight and fills each and every nook and corner even in the congested reinforcement without any need of vibration, tamping etc. Addition of various minerals admixtures as partial cement replacement was found to improve the performance of SCC. The workability and durability of self compacting concrete get enhanced by using industrial by-products such as fly ash, GGBFS (ground granulated blast furnace slag), risk husk, silica fume and limestone powder etc. In production of cement, CO2 gas is emitted which lead to the environment pollution which can be prevented by replacing cement with other industrial by products. Current study investigates the effect of incorporating Micro silica and Nano silica by partially replacing cement in the self compacting concrete mix on its mechanical and durability properties. Replacement of micro silica varies from 0% to 10% at an increment of 2.5% and after analyzing the various composite mixes with micro silica to achieve maximum strength in 28 days, the optimum percentage micro silica (giving optimum strength) is fixed. Thereafter, composite mixes with optimum % of micro silica and varying % of nano silica from 0.25% to 1% (increasing @ 0.25%) are casted and analyzed for various mechanical and durability properties. This study also examines the combined effect of micro silica and nano silica on the mechanical and durability properties of the mixes produced when compared with the control mix (mix without micro and nano-silica) and to work out the optimum percentage of replacement of micro silica and nano silica in SCC mixes. Fresh concrete tests such as slump flow, T500mm time, V-funnel, L-box, U-box and J-ring were conducted to confirm parameters to lie under the category of SCC as suggested by EFNARC standard. Various other tests i.e. compressive strength, UPV, rebound hammer, water absorption, chloride resistance, and sulphate resistance were conducted to achieve objective of research.

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