Research Article
Quantifying Repeatability Reproducibility Sources of Error and Capacity of a Measurement: Demonstrated Using Laboratory Soil Plasticity Tests
Table 4
Correlations between the Casagrande cup and fall cone liquid limit test results.
| Reference | Material | LL range (%) | Number of specimens | Correlations |
| Sherwood and Ryley [17] | Various clays | 30–76 | 25 | LLcone = 0.95 LLcup + 0.95 | Belviso et al. [21] | Natural soils, Southern Italy | 34–134 | 16 | LLcone = 0.97 LLcup + 1.19 | Wasti and Bezirci [22] | Turkey natural soils | 27–110 | 15 | LLcone = 1.01 LLcup + 4.92 | Dragoni et al. [24] | Clayey soils, Central Italy | 28–74 | 41 | LLcone = 1.02 LLcup + 2.87 | Özer [25] | Natural soils, Turkey | 29–104 | 32 | LLcone = 0.90 LLcup + 6.04 | Fojtová et al. [23] | Ostrava Basin clay, Czek Republic | 20–50 | 52 | LLcone = 1.00 LLcup + 2.44 | Di Matteo [15] | Database of various soils | 24–50 | >50 | LLcone = 1.00 LLcup + 2.20 | Spagnoli [20] | Kaolinite and illitic clay | 20–61 | 50 | LLcone = 0.99 LLcup + 1.05 | Present study | Crushed limestone material plus bentonite | 20–45 | 45 | LLcone = 0.85 LLcup + 5.51 |
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