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

Table 13

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

Source	Sum of squares	Degrees of freedom	Mean square	value	value
Model	2.50	5	0.50	196.28	<0.0001
-HIPS (Vol %)	2.29	1	2.29	901.04	<0.0001
- ratio	0.20	1	0.20	79.21	<0.0001
	0.002500	1	0.002500	0.98	0.3547
	0.00001388	1	0.00001388	0.005450	0.9432
	0.0004496	1	0.0004496	0.18	0.6869
Residual	0.018	7	0.002546
Lack of fit	0.018	3	0.005941
Pure error	0.000	4	0.000
Total	2.52	12