Table 6: Optimization of concrete mixture design.

Optimization option (MPa)Optimum levels of the mixture variables Cost level
  
(kg/m3)
  
(by mass)
  
(by mass)

(i) Optimizing the levels of and for achieving maximum  compressive  strengths at different levels of 42.13500.380.45Low
40.73750.380.45Medium
39.34000.380.45High

(ii) Optimizing the levels of and for achieving different target  compressive  strengths at different levels of 30.00.480.40
35.03500.440.42Low
40.00.400.44
30.00.470.41
35.03750.430.42Medium
40.00.380.44
30.00.460.41
35.04000.410.43High
40.00.380.45