Advances in concrete construction

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Strength prediction and correlation of concrete by partial replacement of fly ash & silica fume

  • Kanmalai C. Williams (IPMCS Pvt. Ltd.) ;
  • R. Balamuralikrishnan (Department of Civil & Environmental Engineering, College of Engineering, National University of Science & Technology)
  • Received : 2022.07.02
  • Accepted : 2024.06.17
  • Published : 2023.12.25
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Abstract

Strength prediction and correlation of concrete is done using experimental and analytical methods. Main objective is to correlate the experimental and simulated values of compressive strength of concrete mix using Fly Ash (FA) and Silica Fume (SF) by partial replacement of cement in concrete. Mix proportion was determined using IS method for M40grade concrete. Hundred and forty-seven cubes were cast and tested using Universal Testing Machine (UTM). Genetic Algorithm (GA) model was developed using C++ program to simulate the compressive strength of concrete for various proportions of FA and SF replacements individually at 3% increments. Experiments reveal that 12 percent silica fume replacement produced maximum compressive strength of 35.5 N/mm2, 44.5 N/mm2 and 54.8 N/mm2 moreover 9 percent fly ash replacement produced a maximum strength of 31.9 N/mm2, 37.6 N/mm2 and 51.8 N/mm2 during individual material replacement of concrete mix. Correlation coefficient for each curing period of fly ash and silica fume replaced mix were acquired using trend lines. The correlation coefficient is found to be approximately 0.9 in FA and SF replaced mix irrespective of the mix proportion and age of concrete. A higher and positive correlation was found between the experimental and simulated values irrespective of the curing period in all the replacements.

Keywords

References

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