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

Table 9

Analysis of variance for dry density (kg/m³) response surface quadratic model.

Source	Sum of squares	Degrees of freedom	Mean square	value	value
Model	239000	5	47791.78	451.76	<0.0001
-HIPS (Vol %)	217000	1	217000	2050.85	<0.0001
- ratio	10670.70	1	10670.70	100.87	<0.0001
	3858.89	1	3858.89	36.48	0.0005
	6305.28	1	6305.28	59.60	0.0001
	1.64	1	1.64	0.015	0.9045
Residual	740.54	7	105.79
Lack of fit	740.54	3	246.85
Pure error	0.000	4	0.000
Total	239700	12