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

Table 14

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

Source	Sum of squares	Degrees of freedom	Mean square	value	value
Model	7.18	5	1.44	938.32	<0.0001
-HIPS (Vol %)	4.17	1	4.17	2723.15	<0.0001
- ratio	2.93	1	2.93	1912.32	<0.0001
	0.055	1	0.055	36.09	0.0005
	0.030	1	0.030	19.84	0.0030
	0.002514	1	0.002514	1.64	0.2407
Residual	0.011	7	0.001530
Lack of fit	0.011	3	0.003570
Pure error	0.000	4	0.000
Total	7.19	12