Effect of Nano Silica on Different Properties of Concrete Mix and Correlation Between Its Properties
摘要
The most commonly used material for construction is concrete in current scenario and its design consumes more than 90% the entire production of cement in the world. There is an enhancement in CO2 emissions with the utilization of huge amount of cement produced and affects the greenhouse. During the production of each tonne of Portland cement, about one tonne of CO2 is released in the space. Keeping in view the emission of carbon dioxide as well as scarcity of natural resources, the use of waste materials is the need of the hour. A process to decrease the amount of cement in concrete mixes is through the make use of supplementary cementitious materials having significant amounts of silica fines. One of the silica fines having an extremely high probable as cement alternative and as concrete additive is NS (Nano silica). So study was undertaken using nano silica and silica fume (waste materials) in concrete in order to reduce the environmental pollution as well as in increase the strength and durability properties. Cement (Ordinary Portland) was partly replaced by nano silica with percentage of 2%, 3% & 4% and replacement level of silica fume was kept constant at 8% for the 0.38 water cement ratio. Abrasion resistance was calculated in terms of average dip of grinding. The test results show 34.54% increase in compressive strength and 21% reduction in average dip of grinding at curing period of 56 days. It is also observed that average dip of grinding decrease by the increase in compressive strength of concrete. The percentage decrease in average dip of grinding was doubled with the percentage increase in compressive strength of concrete after 28 days of curing. Scanning electron microscope (SEM) test and Energy Dispersive Spectroscopy (EDS) test were also conducted to authenticate the results of compressive strength test. The relation between compressive strength with abrasion resistance and Split tensile strength has been developed and the results are found significant. The values of R2 are 0.6588 and 0.8616 respectively. The current study was compared with three other authors. It was obtained that there is reasonable deviation of data from the regression equations from Oluokun et al. equation and deviation starts increasing with the increase in strength. Integral absolute error was also determined. It was found that IAE in most of the cases is than permissible limit of 10%. The results confirmed that the joint use of nano silica and silica fume has better impact on strength and durability properties than conventional concrete.