Limitations of the Approach Sample Clauses

Limitations of the Approach. There are limitations in using the air permeameter with coarse-textured soils. When the measured air conductivity is larger than approximately 0.04 inches/second (0.1 cm/s), accurately measuring the time to move air through the soil sample becomes difficult once the upper column seal has been released. This air conductivity value corresponds to a saturated hydraulic conductivity of 0.4 inches/second (1 cm/s), which is typical of coarse gravel. Non-uniform soil textures within a soil layer resulted in another limitation for the air permeameter. Packing non-uniform soil sometimes resulted in large macropores or continuous air gaps within the soil sample and between the sample and the test cylinder. This can result in preferential flow paths through the column. A large diameter permeameter has the advantage of reducing this effect. The soil can be agitated in the permeameter until the "holes" are filled in with the finer soil. Table 2.1—Density and viscosity of water and air at different temperatures (from Xxxxx, 1993). Temperature °C ρwater(kg/m3) µwater(kg/m⋅s) ρair(kg/m3) µair(kg/m⋅s) 10 1000 1.3(10-3) 1.25 1.76(10-5) Temperature °F ρwaterg (lb/ft3) µwater (lbm/ft⋅s) ρairg (lb/ft3) µair (lbm/ft⋅s) 50 62.4 1.8(10-4) 0.078 2.43(10-6) 68 62.3 1.4(10-4) 0.075 2.5(10-6) Table 2.2—Comparison of measured air conductivity values for different size permeameters. Synthetic Sample D = 0.5 inch D = 2.5 inch D = 4 inch Kair (in/s) porosity Kair (in/s) porosity Kair (in/s) porosity #16 2.3E-02 ` #50 7.9E-04 0.26 8.3E-04 0.35 7.9E-04 0.34 #50 8.3E-04 0.26 8.7E-04 0.35 9.8E-04 0.35 #50 1.4E-03 0.31 #50 1.7E-03 0.32 #50 1.6E-03 0.33 #125 7.5E-05 0.37 9.8E-05 0.44 9.8E-05 0.43 #125 1.1E-04 0.37 7.1E-05 0.45 1.2E-04 0.46 #125 1.1E-04 0.45 #125 1.2E-04 0.46 Synthetic Sample D = 1.25 cm D = 6.35 cm D = 10.16 xx Xxxx (cm/s) porosity Kair (cm/s) porosity Kair (cm/s) porosity #16 5.8E-02 #50 2.00E-03 0.26 2.10E-03 0.35 2.00E-03 0.34 #50 2.10E-03 0.26 2.20E-03 0.35 2.50E-03 0.35 #50 3.60E-03 0.31 #50 4.30E-03 0.32 #50 4.10E-03 0.33 #125 1.90E-04 0.37 2.50E-04 0.44 2.50E-04 0.43 #125 2.70E-04 0.37 1.80E-04 0.45 3.10E-04 0.46 #125 2.80E-04 0.45 #125 3.00E-04 0.46 Figure 2.1—Stand-alone air permeameter (from Xxxxxxxx and Xxxxxxx, 2001).
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