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

Table 12

ANOVA results for response surface quadratic model parameters.

Responses	Source	SOS	DF	MS	F-value	value	R
28-day compressive strength (R1)	Model	626.52	5	125.30	107.56	<0.0001	Sign.
	A	520.47	1	520.47	446.78	<0.0001	Sign.
	B	28.85	1	28.85	24.76	0.0016	Sign.
	AB	30.80	1	30.80	26.44	0.0013	Sign.
	A^2	25.41	1	25.41	21.81	0.0023	Sign.
	B^2	27.03	1	27.03	23.20	0.0019	Sign.
	Residual	8.15	7	1.16
	Lack of fit	5.84	3	1.95	3.36	0.1360	Not sign.
	Pure error	2.32	4	0.5789
28-day flexural strength (R2)	Model	90.44	5	18.09	245.66	<0.0001	Sign.
	A	74.60	1	74.60	1013.12	<0.0001	Sign.
	B	1.58	1	1.58	21.50	0.0024	Sign.
	AB	2.06	1	2.06	27.97	0.0011	Sign.
	A^2	11.33	1	11.33	153.83	<0.0001	Sign.
	B^2	1.87	1	1.87	25.40	0.0015	Sign.
	Residual	0.5154	7	0.0736
	Lack of fit	0.1229	3	0.0410	0.4176	0.7505	Not sign.
	Pure error	0.3925	4	0.0981
28-day flexural-compressive ratio (R3)	Model	21.59	5	4.32	193.8	<0.0001	Sign.
	A	16.37	1	16.37	732.68	<0.0001	Sign.
	B	0.1649	1	0.1649	7.38	0.0299	Sign.
	AB	0.2704	1	0.2704	12.10	0.0103	Sign.
	A^2	4.77	1	4.77	213.46	<0.0001	Sign.
	B^2	0.1737	1	0.1737	7.77	0.0270	Sign.
	Residual	0.1564	7	0.0223
	Lack of fit	0.0607	3	0.0202	0.8452	0.5365	Not sign.
	Pure error	0.0957	4	0.0239

SOS: sum of squares; DF: degree of freedom; MS: mean square; R: remark; Sign.: significant.