Research Article
Response Surfaces for Fresh and Hardened Properties of Concrete with E-Waste (HIPS)
Table 14
Analysis of variance for 7-day flexural strength (MPa) response surface quadratic model.
| Source | Sum of squares | Degrees of freedom | Mean square | value | value |
| Model | 7.18 | 5 | 1.44 | 938.32 | <0.0001 | -HIPS (Vol %) | 4.17 | 1 | 4.17 | 2723.15 | <0.0001 | - ratio | 2.93 | 1 | 2.93 | 1912.32 | <0.0001 | | 0.055 | 1 | 0.055 | 36.09 | 0.0005 | | 0.030 | 1 | 0.030 | 19.84 | 0.0030 | | 0.002514 | 1 | 0.002514 | 1.64 | 0.2407 | Residual | 0.011 | 7 | 0.001530 | | | Lack of fit | 0.011 | 3 | 0.003570 | | | Pure error | 0.000 | 4 | 0.000 | | |
| Total | 7.19 | 12 | | | |
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