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

Table 15

Analysis of variance for 28-day flexural strength (MPa) response surface quadratic model.

Source	Sum of squares	Degrees of freedom	Mean square	value	value
Model	7.23	5	1.45	1305.46	<0.0001
-HIPS (Vol %)	4.86	1	4.86	4385.45	<0.0001
- ratio	2.17	1	2.17	1959.93	<0.0001
	0.053	1	0.053	47.73	0.0002
	0.14	1	0.14	125.20	<0.0001
	0.055	1	0.055	49.45	0.0002
Residual	0.007757	7	0.001108
Lack of fit	0.007757	3	0.002586
Pure error	0.000	4	0.000
Total	7.24	12