Advances in Civil Engineering / 2019 / Article / Tab 1

Research Article

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

Table 1

Trough designs and drying methods for various BLS testing standards.

ParameterSouth Africa TMH1 A4British standard BS1377Australia P6A/1Texas 107-ECalifornia CTM-228

Cross-section shapeSquareSemicircularSemicircularSquareTapered
Cross-section dimension (mm)10 × 1025 diameter25 diameter19 × 19Top width 19.05, bottom width 17.48
Length (mm)150140135 or 250127127
Drying methodOven dry (110°C)Air dry + oven dry (65 and 110°C)aAir dry (24 h) + oven dry (110°C)Air dryb + oven dry (110°C)Air dryb + oven dry (110°C)

aPlace the mold where the soil/water can air-dry slowly in a position free from drafts until the soil has shrunk away from the walls of the mold. Then complete the drying, first at a temperature not exceeding 65°C until shrinkage has largely ceased and then at 105°C to 110°C to complete the drying. bAir-dry the soil bar at room temperature until color changes slightly.

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