Research Article
Estimating Deterioration Rate of Some Carbonate Rocks Used as Building Materials under Repeated Frost Damage Process, China
Table 3
Mean and standard deviation (SD) of point load index strength (Is (50)), MPa, values before and after frost cycles.
| Cycles | Fresh | 10 | 20 | 30 | 40 | 50 | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD |
| Limestone 1 | 6.8 | 0.60 | 6.8 | 0.71 | 6.7 | 0.55 | 6.6 | 0.78 | 6.4 | 0.85 | 6.2 | 0.96 | Limestone 2 | 6.3 | 0.56 | 6.1 | 0.49 | 5.8 | 0.53 | 5.7 | 0.61 | 5.5 | 0.48 | 5.3 | 0.42 | Limestone 3 | 4.8 | 0.44 | 4.6 | 0.56 | 4.5 | 0.39 | 4.3 | 0.47 | 4.0 | 0.59 | 3.6 | 0.51 | Limestone 4 | 6.0 | 0.59 | 5.8 | 0.66 | 5.8 | 0.49 | 5.5 | 0.57 | 5.3 | 0.69 | 5.1 | 0.77 | Limestone 5 | 5.8 | 0.39 | 5.7 | 0.47 | 5.5 | 0.37 | 5.4 | 0.49 | 5.2 | 0.43 | 4.9 | 0.45 | Limestone 6 | 4.1 | 0.40 | 4.1 | 0.36 | 3.9 | 0.41 | 3.7 | 0.48 | 3.4 | 0.49 | 3.0 | 0.53 |
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