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

Table 11

Experimental factors and results of CCD matrix design.

Mix number	Code level of variables		Workability		7-day standard curing (MPa)		28-day standard curing (MPa)
	A	B	Slump (mm)	Slump flow (mm)	Compressive strength	Flexural strength	Compressive strength	Flexural strength
H0			265	360	82.17	7.53	103.59	9.75
H1	−1	−1	245	320	80.12	10.02	120.71	15.58
H2	1	−1	190	220	114.18	17.34	141.15	23.12
H3	−1	1	255	310	86	11.41	130.2	17.67
H4	1	1	225	290	109.45	16.23	139.54	22.34
H5	−α	0	190	255	85.01	10.04	119.51	14.52
H6	α	0	245	270	118.49	17.16	144.08	23.16
H7	0	−α	230	255	95.91	14.05	129.09	19.56
H8	0	α	265	350	98.51	14.96	134.26	21.15
H9	0	0	260	315	106.94	16.1	136.47	21.96
H10	0	0	250	280	106.09	15.97	135.81	21.42
H11	0	0	245	325	105.04	15.76	137.19	21.36
H12	0	0	245	305	105.59	15.33	135.16	21.28
H13	0	0	250	325	106.58	15.79	136.37	21.14