Optimization of River Sand with Spent Garnet Sand in Concrete Using RSM and R Programming Packages

Table 9

Validation of factors and responses with experiment.

Optimized factor	Response 1: compressive strength at 28 days (N/mm^2)				Response 2: flexural strength at 28 days (N/mm^2)
	Design expert predicted	R program predicted	Experiment - measured	Error percent	Design expert predicted	R program predicted	Experiment - measured	Error percent
	28.9	28.9	27.23	5.78	6.703	6.703	6.54	2.43