Research Article
Estimating Deterioration Rate of Some Carbonate Rocks Used as Building Materials under Repeated Frost Damage Process, China
Table 4
Mean and standard deviation (SD) of Schmidt hammer rebound (Sch) 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 | 55.1 | 2.2 | 54.7 | 2.4 | 54.2 | 2.1 | 53.6 | 2.9 | 52.9 | 1.7 | 52.4 | 2.0 | Limestone 2 | 52.7 | 2.6 | 51.8 | 2.2 | 51.1 | 1.9 | 50.6 | 2.0 | 49.9 | 1.7 | 49.3 | 2.1 | Limestone 3 | 38.4 | 1.3 | 37.8 | 1.4 | 36.9 | 0.9 | 36.2 | 1.1 | 35.0 | 1.6 | 34.3 | 1.8 | Limestone 4 | 43.2 | 1.8 | 42.5 | 1.6 | 42.0 | 1.7 | 41.4 | 1.9 | 40.8 | 2.2 | 40.1 | 2.3 | Limestone 5 | 49.8 | 2.0 | 49.0 | 2.1 | 48.2 | 2.4 | 47.6 | 1.8 | 46.5 | 2.3 | 45.7 | 1.9 | Limestone 6 | 34.0 | 0.8 | 33.3 | 0.9 | 32.5 | 1.1 | 31.7 | 1.3 | 31.0 | 1.0 | 30.3 | 1.4 |
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