Effect of Hybrid Steel-Basalt Fiber on Behaviors of Manufactured Sand RPC and Fiber Content Optimization Using Center Composite Design

Table 15

Results of theoretical responses and additional experimental responses of optimal mix design.

Factors and responses	Model predictive value	Actual test value	Error (%)
Steel fiber (%)	3.561
Basalt fiber (%)	0.142
Compressive strength (MPa)	142.45	144.37	1.35
Flexural strength (MPa)	23.25	23.09	0.69
Flexural-compressive ratio (%)	16.36	16.02	2.08
Desirability	0.976