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

Table 12

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

Source	Sum of squares	Degrees of freedom	Mean square	value	value
Model	0.96	5	0.19	474.17	<0.0001
-HIPS (Vol %)	0.73	1	0.73	1816.44	<0.0001
- ratio	0.20	1	0.20	498.39	<0.0001
	0.000225	1	0.0002250	0.56	0.4801
	0.011	1	0.011	28.08	0.0011
	0.003219	1	0.003219	7.95	0.0258
Residual	0.002832	7	0.0004046
Lack of fit	0.002832	3	0.0009442
Pure error	0.000	4	0.000
Total	0.96	12