Advances in concrete construction

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Nano-engineered concrete using recycled aggregates and nano-silica: Taguchi approach

  • Prusty, Rajeswari (Department of Civil Engineering, Indian Institute of Technology Kharagpur) ;
  • Mukharjee, Bibhuti B. (Department of Civil Engineering, Veer Surendra Sai University of Technology) ;
  • Barai, Sudhirkumar V. (Department of Civil Engineering, Indian Institute of Technology Kharagpur)
  • Received : 2014.02.15
  • Accepted : 2015.12.23
  • Published : 2015.12.25
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Abstract

This paper investigates the influence of various mix design parameters on the characteristics of concrete containing recycled coarse aggregates and Nano-Silica using Taguchi method. The present study adopts Water-cement ratio, Recycled Coarse Aggregate (%), Maximum cement content and Nano-Silica (%) as factors with each one having three different levels. Using the above mentioned control parameters with levels an Orthogonal Array (OA) matrix experiments of L9 (34) has selected and nine number of concrete mixes has been prepared. Compressive Strength, Split Tensile Strength, Flexural Tensile Strength, Modulus of Elasticity and Non-Destructive parameters are selected as responses. Experimental results are analyzed and the optimum level for each response is predicted. Analysis of 28 days CS depicts that NS (%) is the most significant factor among all factors. Analysis of the tensile strength results indicates that the effect of control factor W/C ratio is ranked one and then NS (%) is ranked two which suggests that W/C ratio and NS (%) have more influence as compared to other two factors. However, the factor that affects the modulus of elasticity most is found to be RCA (%). Finally, validation experiments have been carried out with the optimal mixture of concrete with Nano-Silica for the desired engineering properties of recycled aggregate concrete. Moreover, the comparative study of the predicted and experimental results concludes that errors between both experimental and predicted values are within the permissible limits. This present study highlights the application of Taguchi method as an efficient tool in determining the effects of constituent materials in mix proportioning of concrete.

Keywords

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