Study of Concrete having Industrial Waste as Fine Aggregate Replacement and Generation of Model for Prediction of Compressive Strength Using Response Surface Method

This work focuses on the possibility of optimum utilization of Industrial by-product by replacing the natural sand with Pond Ash and Slag in the concrete. This work also aims in the prediction of 28 days strength using early age measurement of resistivity and compressive strength. Mechanical properties of modified concrete have been obtained and compared with that of the standard mix of concrete. Uniaxial electrical resistivity measurement has been performed on the samples. These observations have been compared with results given by previous researchers. Using these comparison performances based quality control, diffusion of chloride and corrosion of rebar in concrete has been assessed. Further, statistical model has been generated for the prediction of 28 days compressive strength by Response Surface Method (RSM) using early age measurement of resistivity and compressive strength as dependent variables. The results obtained indicate that, for slag model the ultimate strength is not much affected rather resistivity has been significantly improved; consequently it has better quality, reduced corrosion and lower diffusion coefficient. In order to compare the results obtained from the RSM model and experimental method, an error analysis had been performed. The errors are approximately 3.63% for the prediction of 28 days strength.