Response Surfaces for Fresh and Hardened Properties of Concrete with E-Waste (HIPS)

Table 10

Analysis of variance for 7-day compressive strength (MPa) response surface quadratic model.

Source	Sum of squares	Degrees of freedom	Mean square	value	value
Model	184.36	5	36.87	183.13	<0.0001
-HIPS (Vol %)	104.08	1	104.08	516.93	<0.0001
- ratio	57.10	1	57.10	283.60	<0.0001
	0.099	1	0.099	0.49	0.5053
	11.33	1	11.33	56.27	0.0001
	3.56	1	3.56	17.68	0.0040
Residual	1.41	7	0.20
Lack of fit	1.41	3	0.47
Pure error	0.000	4	0.000
Total	185.77	12