Research Article
Optimization of River Sand with Spent Garnet Sand in Concrete Using RSM and R Programming Packages
Table 3
ANOVA response 1: compressive strength at 28 days (Design Expert).
| Source | Sum of squares | df | Mean square | value | value | Remarks |
| Model | 37.72 | 2 | 18.86 | 203.5 | <0.0001 | Significant | A- river sand | 34.12 | 1 | 34.12 | 368.14 | <0.0001 | Significant | B- spent garnet sand | 0.0000 | 0 | | | | Insignificant | AB | 5.93 | 1 | 5.93 | 63.98 | <0.0001 | Significant | A2 | 0.0000 | 0 | | | | Insignificant | B2 | 0.0000 | 0 | | | | Insignificant | Residual | 0.9267 | 10 | 0.0927 | | | — | Lack of fit | 0.9267 | 1 | 0.9267 | | | — | Pure error | 0.0000 | 9 | 0.0000 | | | — | Correlation total | 38.65 | 12 | | | | — |
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