Research Article
A Statistical Approach to Optimizing Concrete Mixture Design
Table 4
Compressive strength test results.
| Mix number | 28-day average compressive strength, (MPa) | Standard deviation of three replicates of each mixture (MPa) |
| 1 | 39.7 | 1.9 | 2 | 38.8 | 1.0 | 3 | 39.1 | 0.8 | 4 | 34.1 | 1.2 | 5 | 38.2 | 1.9 | 6 | 40.6 | 2.0 | 7 | 34.2 | 1.1 | 8 | 39.3 | 1.1 | 9 | 39.8 | 1.6 | 10 | 27.9 | 1.1 | 11 | 37.4 | 1.8 | 12 | 38.5 | 1.1 | 13 | 31.9 | 0.8 | 14 | 37.1 | 1.3 | 15 | 33.9 | 0.2 | 16 | 26.5 | 1.4 | 17 | 30.7 | 1.7 | 18 | 36.5 | 1.6 | 19 | 30.0 | 1.5 | 20 | 32.1 | 1.3 | 21 | 30.5 | 0.8 | 22 | 20.7 | 1.8 | 23 | 27.5 | 0.8 | 24 | 29.9 | 0.3 | 25 | 25.4 | 1.1 | 26 | 31.0 | 0.2 | 27 | 25.3 | 0.2 |
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