D40330412423

Impact of Substitution of Silica Nanoparticles on Compressive Strength of Concrete
Anil Kumar Singh¹, Chaitanya Chauhan^2
1Dr. Anil Kumar Singh, Department of Physics, VKS University, Ara (Bihar), India.
²Chaitanya Chauhan, Department of Mechanical Engineering, Manipal Institute of Technology, Manipal (Karnataka), India.
Manuscript received on 02 February 2023 | Revised Manuscript received on 21 February 2023 | Manuscript Accepted on 15 April 2023 | Manuscript published on 30 April 2023 | PP: 1-8 | Volume-12 Issue-4, April 2023 | Retrieval Number: 100.1/ijeat.D40330412423 | DOI: 10.35940/ijeat.D4033.0412423

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Abstract: In the present work, we studied the effect of substitution of silica nanoparticles (SNPs), by replacement of cement, on ultrasound pulse velocity and compressive strength of concrete specimens. We also obtained a correlation between ultrasound pulse velocity (UPV) and the compressive strength. The mean particle size of silica nanoparticles was 20nm. The quality of the concrete specimen was assessed by measuring the ultrasound pulse velocity (UPV) in meters per second (m/s) and the compressive strength (N/mm²). The average value of UPV on 7 th day of curing turned out to become 3200 ± 36, 3215 ± 42, 3290 ± 41, 3349 ± 24, 3450±17 and 3456 ± 12 for 0%, 0.5%, 1.0%, 1.5%, 2.0% and 2.5% content of SNPs in the specimens respectively. Similarly, the average value of UPV on the 28th day was 3540 ± 36, 3580 ± 38, 3696 ± 42, 3820 ± 39, 4160 ± 40, and 4163 ± 41 for the same amount of substitution of SNPs, respectively. It had been observed that the UPV was higher in specimens replaced by silica nanoparticles (by weight of cement) and achieved maximum strength at nearly 2% (between 2.0% and 2.5%). The average compressive strength on 7th day was 25, 25, 27.6, 30, 32.4 and 32 N/mm2 , but, on 28th day the it increased up to 38, 38.5, 40, 42, 48.5 and 48.8 N/mm2 for the duplicate content of silica nanoparticles ( 0%, 0.5%, 1.0%, 1.5%, 2.0% and 2.5%) respectively. As UPV increased, so did the compressive strength. We observed a strong correlation (correlation coefficient 0.997) between USV and compressive strength and variance (R2 = 0.87), which meant 87% of the variation of compressive strength could be explained by the variation of USV for the specimens (which acquired their compressive strength) on the 28th day. Compressive strength and USV increased due to the hydration reaction, leading to the formation of C-S-H (Calcium-Silicatehydrate) gel, which filled the pores in the concrete matrix. The compressive strength of concrete significantly increased with the content of silica nanoparticles within the selected range of content (1.5-2.5%). Still, there is a limitation, probably due to the agglomeration of nanoparticles, which destroyed the salient features of the nanoparticles.

Keywords: Agglomeration, Compressive Strength, Ultrasound Pulse Velocity, Concrete Mix.
Scope of the Article: Concrete Engineering