Advances in Civil Engineering / 2019 / Article / Tab 7

Research Article

Quantifying Repeatability Reproducibility Sources of Error and Capacity of a Measurement: Demonstrated Using Laboratory Soil Plasticity Tests

Table 7

Repeatability and reproducibility results reported in ASTM D4318 and determined by two-way ANOVA-based analysis for the various laboratory tests.

ParametersLiquid limitPlastic limitBar linear shrinkage
Casagrande cupFall coneASTM rollerbFall cone

Repeatability and reproducibility (R&R) reported in ASTM D4318a
Single-operator standard deviation (%)
(within-laboratory repeatability)
Multilaboratory standard deviation (%)
(between-laboratory reproducibility)

Two-way ANOVA-based R&R Analysis Results
95% confidence interval (%)0.5–0.80.4–0.60.3–0.50.5–0.9
95% confidence interval (%)1.1–3.80.3–1.70.4–1.50.4–2.7
95% confidence interval (%)1.3–3.50.5–1.10.5–1.20.7–1.7
Fraction of due to 11502743
Fraction of due to 89507357

aThe R&R analysis was conducted on a USCS: ML soil. bThe ASTM PL test was conducted on four samples, because the 0% bentonite sample was nonplastic.

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