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

Table 16

Model statistics for all response variables.

Responses	Predicted -squared	Adjusted -squared	value	Prob >	Model comment
Slump	0.8538	0.9667	70.65	<0.0001	Significant
Fresh density	0.9743	0.9857	129.25	<0.0001	Significant
Dry density	0.9720	0.9947	451.76	<0.0001	Significant
7-day compressive strength	0.9232	0.9870	183.13	<0.0001	Significant
28-day compressive strength	0.9083	0.9532	49.36	<0.0001	Significant
7-day split tensile strength	0.9712	0.9950	474.17	<0.0001	Significant
28-day split tensile strength	0.9435	0.9879	196.28	<0.0001	Significant
7-day flexural strength	0.9870	0.9974	938.32	<0.0001	Significant
28-day flexural strength	0.9899	0.9982	1305.46	<0.0001	Significant